JP6947956B1 - Fiber reinforced members and joint structures - Google Patents

Abstract

Provided is a fiber reinforced member capable of satisfactorily joining fiber reinforced members to each other. The fiber reinforcing member according to the present invention has a first layer which is a resin partially impregnated fiber portion partially impregnated with a resin and a second layer containing a fiber and a thermoplastic resin, and the second layer. The first layer is arranged on the surface of the layer.

Description

The present invention relates to a fiber reinforced member containing a thermoplastic resin and fibers. The present invention also relates to a bonded structure using the fiber reinforced member.

Generally, in a fiber reinforced member, high performance is exhibited by impregnating the fiber with a resin and integrating the resin and the fiber.

Patent Document 1 below includes a resin-unimpregnated fiber bundle portion containing a resin and a fiber bundle and having a surface not impregnated with the resin, or a resin partially impregnated fiber bundle portion having a surface not impregnated with the resin. , A fiber reinforced sheet having a first surface and a second surface opposite to the first surface is disclosed. This fiber-reinforced sheet includes a sheet main body portion and at least one ridge portion protruding from the sheet main body portion on the first surface side thereof, and has a first surface and a second surface. At least one of the above includes the resin-unimpregnated fiber bundle portion or the resin partially impregnated fiber bundle portion.

WO2017 / 056683A1

With the conventional fiber-reinforced members as described in Patent Document 1, it is difficult to satisfactorily join the fiber-reinforced members to each other. For example, in the conventional fiber-reinforced members as described in Patent Document 1, even if the fiber-reinforced members are joined to each other by a fiber-reinforced sheet or the like, it is difficult to increase the strength of the joined portion.

An object of the present invention is to provide a fiber-reinforced member capable of satisfactorily joining fiber-reinforced members to each other. Another object of the present invention is to provide a bonded structure using the fiber-reinforced member.

According to a broad aspect of the present invention, the second layer having a first layer which is a resin partially impregnated fiber portion partially impregnated with a resin and a second layer containing a fiber and a thermoplastic resin. A fiber reinforcing member is provided in which the first layer is arranged on the surface of the layer.

In a specific aspect of the fiber-reinforced member according to the present invention, the first layer has a portion impregnated with resin and a portion not impregnated with resin in the thickness direction of the first layer. A portion of the first layer impregnated with the resin is arranged on the surface of the second layer, and the fibers contained in the second layer are continuous fibers.

In a specific aspect of the fiber-reinforced member according to the present invention, the fiber-reinforced member comprises a base material portion, a fiber-free resin portion arranged on the surface of the base material portion, and the base of the resin portion. It has the second layer arranged on the side opposite to the material portion side and the first layer arranged on the side opposite to the resin portion side of the second layer.

In a specific aspect of the fiber-reinforced member according to the present invention, the fiber-reinforced member includes a base material portion and a rib portion protruding from the first surface of the base material portion, and the rib portion provides fibers. It has a resin portion that does not contain the resin portion, the second layer arranged outside the resin portion, and the first layer arranged outside the second layer.

In a specific aspect of the fiber reinforced member according to the present invention, the maximum width of the rib portion is 0.3 cm or more and 5 cm or less, the height of the rib portion is 0.3 cm or more and 10 cm or less, and the rib portion. The length of the part is 10 cm or more.

In a specific aspect of the fiber-reinforced member according to the present invention, the resin portion contains acrylic particles having a hollow structure.

In a specific aspect of the fiber reinforced member according to the present invention, the base material portion contains a resin and a fiber.

In a specific aspect of the fiber reinforcing member according to the present invention, the base material portion has a resin-unimpregnated fiber portion that is not impregnated with resin, or a resin partially impregnated fiber that is partially impregnated with resin. Has a part.

In a specific aspect of the fiber reinforced member according to the present invention, the base material portion is a carbon fiber cloth, a carbon fiber felt mat, a carbon fiber paper, a carbon fiber chopped yarn, a glass roving cloth, a glass fiber paper, a glass chopped strand. Includes mats or glass roving mats.

In a specific aspect of the fiber-reinforced member according to the present invention, the resin contained in the base material is a cured product of a thermosetting resin, and the thermosetting resin is an unsaturated polyester resin or vinyl ester resin. , Epoxy resin, or phenol resin.

In a specific aspect of the fiber reinforced member according to the present invention, the first layer is the outermost layer.

In a specific aspect of the fiber-reinforced member according to the present invention, the form of the fiber contained in the first layer is a non-woven fabric.

In a specific aspect of the fiber reinforced member according to the present invention, the nonwoven fabric is made of glass fiber.

In a specific aspect of the fiber-reinforced member according to the present invention, the average thickness of the first layer is 0.1 mm or more and 1.0 mm or less.

According to a broad aspect of the present invention, the first fiber reinforcing member, the second fiber reinforcing member, and the joining member are provided, and the first fiber strengthening member and the second fiber strengthening member are provided by the joining member. Provided is a bonded structure in which the members are joined to each other, and the first fiber-reinforced member and the second fiber-reinforced member are each formed of the above-mentioned fiber-reinforced member.

In certain aspects of the joining structure according to the present invention, the joining member is on the surface of the first layer of the first fiber reinforced member and the first layer of the second fiber reinforced member. It is arranged so as to reach both the surface of the surface and the surface of the surface.

In a specific aspect of the bonding structure according to the present invention, the bonding member is a resin partially impregnated fiber portion partially impregnated with resin or a fiber entirely impregnated with resin impregnated fiber portion. It is a reinforced sheet.

In certain aspects of the bonded structure according to the present invention, the form of the fibers contained in the fiber reinforced sheet is UD, woven fabric or non-woven fabric.

In certain aspects of the bonded structure according to the present invention, the fibers contained in the fiber reinforced sheet are glass fibers or carbon fibers.

In certain aspects of the joint structure according to the present invention, the joint structure comprises a fixing member, the fixing member being arranged outside the joint member.

In certain aspects of the joined structure according to the present invention, the fixing member is a resin member, a metal member, or a wood member.

The fiber reinforcing member according to the present invention has a first layer which is a resin partially impregnated fiber portion partially impregnated with a resin and a second layer containing a fiber and a thermoplastic resin, and the second layer is described above. The first layer is arranged on the surface of the layer. Since the fiber-reinforced member according to the present invention has the above-mentioned structure, the fiber-reinforced members can be satisfactorily joined to each other.

1 (a) and 1 (b) are a cross-sectional view and a plan view schematically showing a fiber reinforced member according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a fiber reinforcing member according to a second embodiment of the present invention. 3A and 3B are a cross-sectional view and a plan view schematically showing a joint structure according to the first embodiment of the present invention. 4 (a) and 4 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a second embodiment of the present invention. 5 (a) and 5 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a third embodiment of the present invention. 6 (a) and 6 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a fourth embodiment of the present invention. FIG. 7 is a plan view schematically showing a joint structure according to a fifth embodiment of the present invention. FIG. 8 is a plan view schematically showing the joint structure according to the sixth embodiment of the present invention. FIG. 9 is a plan view schematically showing the joint structure according to the seventh embodiment of the present invention. FIG. 10 is a plan view schematically showing a joint structure according to an eighth embodiment of the present invention. 11 (a) and 11 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a ninth embodiment of the present invention. 12 (a) and 12 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a tenth embodiment of the present invention. FIG. 13 is a plan view schematically showing the joint structure according to the eleventh embodiment of the present invention. FIG. 14 is a plan view schematically showing a joint structure according to a twelfth embodiment of the present invention.

The fiber reinforcing member according to the present invention has a first layer which is a resin partially impregnated fiber portion partially impregnated with a resin and a second layer containing a fiber and a thermoplastic resin, and the second layer is described above. The first layer is arranged on the surface of the layer.

Since the fiber-reinforced member according to the present invention has the above-mentioned structure, the fiber-reinforced members can be satisfactorily joined to each other. Since the fiber-reinforced member according to the present invention includes a specific first layer, the fiber-reinforced members can be satisfactorily joined to each other by the joining member. Therefore, in the present invention, the strength of the bonded structure obtained by bonding the fiber-reinforced members to each other can be increased.

In the present invention, since the fiber-reinforced members can be satisfactorily joined by the joining member, the fiber-reinforced members can be transported in a size smaller than the size actually used in the field, and the transportation cost can be suppressed.

From the viewpoint of better joining the fiber-reinforced members to each other, in the fiber-reinforced members, the first layer has a portion impregnated with the resin in the thickness direction of the first layer and the resin. It is preferable to have a portion that is not impregnated. From the viewpoint of even better joining the fiber-reinforced members, in the fiber-reinforced members, a portion of the first layer impregnated with the resin is arranged on the surface of the second layer. Is more preferable.

From the viewpoint of further increasing the strength of the fiber-reinforced member, the fiber-reinforced member includes a base material portion, a fiber-free resin portion arranged on the surface of the base material portion, and the base material of the resin portion. It is preferable to have the second layer arranged on the side opposite to the portion side and the first layer arranged on the side opposite to the resin portion side of the second layer.

The fiber reinforcing member may or may not have a rib portion. When the fiber reinforcing member has a rib portion, the fiber reinforcing member preferably has the following configuration. That is, the fiber reinforcing member preferably includes a base material portion and a rib portion protruding from the first surface of the base material portion, and the rib portion includes a resin portion containing no fiber and the resin portion. It is preferable to have the second layer arranged outside the second layer and the first layer arranged outside the second layer.

Hereinafter, the present invention will be clarified by explaining specific embodiments of the present invention with reference to the drawings. In the drawings below, the size, thickness, shape, etc. may differ from the actual size, thickness, shape, etc. for convenience of illustration.

1 (a) and 1 (b) are a cross-sectional view and a plan view schematically showing a fiber reinforced member according to a first embodiment of the present invention. FIG. 1 (a) is a cross-sectional view taken along the line I-I of FIG. 1 (b).

The fiber reinforcing member 1 shown in FIG. 1 includes a base material portion 2 and a plurality of rib portions 3. The rib portion 3 protrudes from the first surface 2a of the base material portion 2. The rib portion 3 is a linear convex portion and a ridge portion. The rib portion 3 includes a resin portion 13 containing no fiber, a second layer 12 containing fibers and a thermoplastic resin, and a first layer 11 which is a resin partially impregnated fiber portion partially impregnated with the resin. Has. The fiber reinforcing member 1 is in the form of a sheet.

The second layer 12 is arranged outside the resin portion 13. The second layer 12 is arranged on the outer surface of the resin portion 13. The first layer 11 is arranged outside the second layer 12. The first layer 11 is arranged on the outer surface of the second layer 12.

The resin portion 13 is a core portion in the rib portion 3. The first layer 11 is the outermost layer in the rib portion 3. The second layer 12 is arranged between the resin portion 13 and the first layer 11.

The rib portion 3 has a length direction L, a height direction H, and a width direction W. The length direction L, the height direction H, and the width direction W are orthogonal to each other. The rib portion 3 extends along the length direction L. The resin portion 13, the second layer 12, and the first layer 11 extend along the extending direction of the rib portion 3, respectively.

In the cross section (FIG. 1 (a)) of the rib portion 3 along the height direction H, the shape of the rib portion 3 is a semi-elliptical shape. The rib portion 3 has a maximum width at the contact surface with the first surface 2a. The height of the rib portion 3 is the distance from the first surface 2a to the tip of the first layer 11.

FIG. 2 is a cross-sectional view schematically showing a fiber reinforcing member according to a second embodiment of the present invention.

The fiber reinforcing member 1A shown in FIG. 2 has a first layer 11A which is a resin partially impregnated fiber portion partially impregnated with a resin, and a second layer 12A containing a fiber 21 and a thermoplastic resin 22. .. The first layer 11A has a resin-impregnated portion R1 and a resin-impregnated portion R2 in the thickness direction of the first layer 11A. In the fiber reinforced member 1A, the portion R1 impregnated with the resin of the first layer 11A is arranged on the surface of the second layer 12A. In FIG. 2, the portion below the dotted line is the portion R1 impregnated with the resin, and the portion above the dotted line is the portion R2 not impregnated with the resin. In the fiber reinforcing member 1A, continuous fibers are used as the fibers 21 contained in the second layer 12A. The continuous fibers contained in the second layer 12A are aligned in one direction. Unlike the fiber reinforcing member 1 shown in FIG. 1, the fiber reinforcing member 1A does not have a rib portion. The fiber reinforcing member 1A has a sheet shape.

Hereinafter, the details of the fiber reinforcing member will be further described.

(First layer and second layer)
The fiber reinforcing member has a first layer and a second layer. The first layer and the second layer are in contact with each other. The first layer is arranged on the surface of the second layer. The first layer is arranged on the first surface of the second layer.

The first layer contains a resin and fibers. The first layer is a resin partially impregnated fiber portion that is partially impregnated with resin. The first layer preferably has a portion partially impregnated with the resin in the thickness direction of the first layer. The first layer preferably has a portion impregnated with the resin and a portion not impregnated with the resin in the thickness direction of the first layer. It is preferable that the first layer has a portion not impregnated with the resin on the outer surface side and a portion impregnated with the resin on the inner surface side. It is preferable that a portion of the first layer impregnated with the resin is arranged on the surface of the second layer.

The first layer is preferably impregnable with an adhesive or resin, and more preferably impregnated with resin. In particular, it is preferable that the outer surface side of the first layer can be impregnated with an adhesive or a resin, and more preferably the resin can be impregnated. The surface side of the first layer opposite to the second layer is preferably impregnable with an adhesive or a resin, and more preferably impregnated with a resin.

The second layer contains fibers and a thermoplastic resin. The second layer may or may not have a portion impregnated with the thermoplastic resin and a portion not impregnated with the thermoplastic resin in the thickness direction of the second layer. It does not have to be. The second layer is preferably a prepreg containing fibers and a thermoplastic resin, more preferably a prepreg containing carbon fibers or glass fibers and a thermoplastic resin, and the carbon fibers and the thermoplastic resin. More preferably, it is a prepreg containing. The fibers contained in the second layer may be continuous fibers or may not be continuous fibers. When the fiber contained in the second layer is a continuous fiber, the strength of the fiber reinforcing member can be further increased.

The details of the first layer and the second layer will be described later.

(Base material part)
The fiber reinforced member may or may not include a base material portion. When the fiber reinforcing member includes a rib portion, the fiber reinforcing member preferably includes a base material portion. However, the fiber reinforcing member may be a fiber reinforcing member having no rib portion and having a base material portion. When the fiber reinforcing member includes a base material portion, the strength of the fiber reinforcing member can be increased.

The base material portion preferably contains a resin, and more preferably contains a resin and fibers.

<Resin>
The resin contained in the base material portion may be a thermoplastic resin or a cured product of a thermosetting resin. As the resin contained in the base material portion, only one kind may be used, or two or more kinds may be used in combination.

Examples of the thermoplastic resin include polyolefin resins, polyamide resins, polycarbonate resins, polystyrene resins, polyester resins and the like.

Examples of the thermosetting resin include unsaturated polyester resins, vinyl ester resins, epoxy resins, and phenolic resins.

From the viewpoint of increasing the strength of the base material portion, the resin contained in the base material portion is preferably a cured product of a thermosetting resin. From the viewpoint of further increasing the strength of the base material, the thermosetting resin is preferably an unsaturated polyester resin, a vinyl ester resin, an epoxy resin, or a phenol resin, and the unsaturated polyester resin or vinyl ester. More preferably, it is a resin or an epoxy resin. That is, the resin contained in the base material portion is preferably a cured product of unsaturated polyester resin, a cured product of vinyl ester resin, a cured product of epoxy resin, or a cured product of phenolic resin, and is preferably unsaturated polyester. It is more preferable that it is a cured product of a resin, a cured product of a vinyl ester resin, or a cured product of an epoxy resin.

<Fiber>
Examples of the fiber contained in the base material portion include glass fiber, carbon fiber, and aramid fiber.

From the viewpoint of suppressing the production cost, the fiber contained in the base material portion is preferably a fiber bundle. The fiber bundle is a bundle of a plurality of fibers. The fiber bundle is, for example, a reinforcing fiber bundle. The elastic modulus of the fiber bundle, particularly the elastic modulus of the reinforcing fiber bundle, is relatively high. The form of the fiber bundle is not particularly limited. The fiber bundle may be a fiber sheet formed by stitching or the like.

When the base material portion contains a resin and fibers, the base material portion has a resin-unimpregnated fiber portion that is not impregnated with resin, or a resin partially impregnated fiber that is partially impregnated with resin. It is preferable to have a portion. The resin-unimpregnated fiber portion preferably has a portion not impregnated with resin in the thickness direction of the base material portion. The resin partially impregnated fiber portion preferably has a portion partially impregnated with the resin in the thickness direction of the base material portion.

The number of fibers in the fiber bundle is not particularly limited. From the viewpoint of increasing the strength of the base material portion, the number of fibers in the fiber bundle is preferably 1000 or more, preferably 50,000 or less.

The fiber contained in the base material portion is preferably carbon fiber or glass fiber. The material of the fiber bundle contained in the base material portion is preferably carbon fiber or glass fiber.

From the viewpoint of increasing the strength of the base material portion, the carbon fibers are preferably carbon fiber cloth (woven fabric), carbon fiber felt mat (nonwoven fabric mat), carbon fiber paper, or carbon fiber chopped yarn.

From the viewpoint of increasing the strength of the base material portion, the glass fiber is preferably a glass roving cloth, a glass fiber paper, a glass chopped strand mat, or a glass roving mat.

That is, the base material preferably contains a carbon fiber cloth, a carbon fiber felt mat, a carbon fiber paper, a carbon fiber chopped yarn, a glass roving cloth, a glass fiber paper, a glass chopped strand mat, or a glass roving mat. In this case, the base material portion may contain two or more of these fibers.

When the base material portion contains the fibers, the content of the fibers contained in the base material portion is preferably 10% by volume or more, more preferably 20% by volume or more, based on 100% by volume of the base material portion. It is preferably 65% by volume or less, more preferably 60% by volume or less. When the fiber content is at least the above lower limit and at least the above upper limit, the strength of the base material portion can be further increased.

The average thickness of the base material portion is preferably 1 mm or more, more preferably 3 mm or more, preferably 10 mm or less, and more preferably 6 mm or less.

The base material portion may be flat, curved, or may have a curved portion. The base material portion may have another shape.

(Ribs and other details of the first and second layers)
The fiber reinforcing member may or may not have a rib portion. When the fiber reinforcing member includes a rib portion, the rib portion is arranged outside the resin portion containing no fiber, the second layer arranged outside the resin portion, and the second layer. It is preferable to have the above-mentioned first layer. That is, it is preferable that the rib portion includes the resin portion, the second layer, and the first layer in this order from the inside to the outside. The following description of the first layer and the second layer naturally applies to the first layer and the second layer of the fiber reinforced member having no rib portion, and also includes a base material portion. This also applies to the first and second layers of the non-fiber reinforced members.

The resin portion does not contain fibers and contains resin.

From the viewpoint of more effectively exerting the effect of the present invention, the first layer is preferably the outermost layer in the rib portion. From the viewpoint of more effectively exerting the effects of the present invention, the first layer is preferably the outermost layer of the fiber-reinforced member.

<Resin>
The resin portion contains a resin. The first layer contains a resin. The second layer contains a thermoplastic resin. The resin contained in the first layer and the thermoplastic resin contained in the second layer may be the same or different. The resin contained in the resin portion, the resin contained in the first layer, and the thermoplastic resin contained in the second layer may be the same or different from each other. Further, the resin contained in the base material portion, the resin contained in the resin portion, the resin contained in the first layer, and the thermoplastic resin contained in the second layer are the same. It may be different.

The resin contained in the resin portion and the resin contained in the first layer may be a thermoplastic resin or a cured product of a thermosetting resin. As the resin contained in the resin portion and the resin contained in the first layer, only one type may be used, or two or more types may be used in combination. As the thermoplastic resin contained in the second layer, only one type may be used, or two or more types may be used in combination.

Examples of the thermoplastic resin include polyolefin resins, polyamide resins, polyvinyl chloride resins, polycarbonate resins, polystyrene resins, polyester resins and the like. Examples of the polyolefin resin include polyethylene resin and polypropylene resin. Examples of the above-mentioned polyamide resin include aliphatic polyamide resins, and specific examples thereof include polyamide 66, polyamide 6, and polyamide 12. Examples of the polystyrene resin include styrene polymer resin, AS resin, ABS resin and the like. Examples of the polyester resin include aliphatic polyester resins, and specific examples thereof include polylactic acid resins.

Examples of the thermosetting resin include unsaturated polyester resins, vinyl ester resins, epoxy resins, and phenolic resins.

From the viewpoint of enhancing the secondary processability, the resin contained in the resin portion is preferably a thermoplastic resin, preferably a polypropylene resin, a polyvinyl chloride resin, or a polyethylene resin.

From the viewpoint of suppressing the production cost and improving the impregnation property of the resin, the resin contained in the first layer is preferably a thermoplastic resin, and may be a polypropylene resin, a polyvinyl chloride resin, or a polyethylene resin. It is preferable to have.

From the viewpoint of enhancing various physical properties and improving the impregnation property of the resin, the thermoplastic resin contained in the second layer is preferably polypropylene resin, polyvinyl chloride resin, or polyethylene resin.

<Fiber>
The resin part does not contain fibers. The first layer contains fibers. The second layer contains fibers. The fibers contained in the first layer and the fibers contained in the second layer may or may not be fiber bundles, respectively. The fiber bundle is a bundle of a plurality of fibers. The form of the fiber bundle is not particularly limited.

Examples of the fiber contained in the first layer include glass fiber, carbon fiber, aramid fiber and the like. From the viewpoint of more effectively exerting the effects of the present invention, the fibers contained in the first layer are preferably glass fibers.

The average fiber diameter of the fibers contained in the first layer is preferably 4 μm or more, more preferably 6 μm or more, preferably 30 μm or less, and more preferably 24 μm or less. The average fiber diameter is a number average fiber diameter. The average fiber diameter is obtained by measuring the fiber diameter (maximum diameter) of 10 or more arbitrary fibers and averaging the measured fiber diameters.

The form of the fiber contained in the first layer is preferably a non-woven fabric. The non-woven fabric is preferably made of glass fiber. That is, the first layer preferably contains a non-woven fabric made of glass fibers. In this case, the effect of the present invention can be exhibited even more effectively.

The basis weight of the non-woven fabric contained in the first layer is preferably 10 g / m ² or more, more preferably 30 g / m ² or more, preferably 1000 g / m ² or less, and more preferably 600 g / m ² or less. .. When the basis weight of the non-woven fabric is at least the above lower limit, the strength of the first layer becomes even higher. When the basis weight of the non-woven fabric is not more than the above upper limit, the impregnation property of the resin becomes even higher. However, the basis weight of the nonwoven fabric contained in the first layer may be 110 g / m ² or less, or 100 g / m ² or less.

When the first layer contains the non-woven fabric, the average thickness of the non-woven fabric is preferably 0.1 mm or more, more preferably 0.2 mm or more, preferably 1.0 mm or less, and more preferably 0.8 mm or less. be. When the average thickness of the non-woven fabric is not less than the above lower limit and not more than the above upper limit, the strength of the rib portion can be further increased, and the effect of the present invention can be further exerted.

Examples of the fiber contained in the second layer include glass fiber, carbon fiber, aramid fiber and the like. The fibers contained in the second layer are preferably continuous fibers. From the viewpoint of more effectively exerting the effects of the present invention, the fibers contained in the second layer are preferably glass fibers or carbon fibers, and more preferably carbon fibers.

Examples of the carbon fiber contained in the second layer include PAN-based carbon fiber and PITCH-based carbon fiber.

The average fiber diameter of the fibers or carbon fibers contained in the second layer is preferably 4 μm or more, more preferably 6 μm or more, preferably 30 μm or less, and more preferably 20 μm or less. The average fiber diameter is a number average fiber diameter. The average fiber diameter is obtained by measuring the fiber diameter (maximum diameter) of 10 or more arbitrary fibers and averaging the measured fiber diameters.

Of the 100% by volume of the first layer, the content of the fibers contained in the first layer is preferably 10% by volume or more, more preferably 20% by volume or more, preferably 65% by volume or less, more preferably. It is 60% by volume or less. When the content of the fiber is not less than the above lower limit and not more than the above upper limit, the strength of the fiber reinforcing member and the rib portion can be further increased, and the effect of the present invention can be further exerted. ..

Of the 100% by volume of the second layer, the content of the fibers contained in the second layer is preferably 30% by volume or more, more preferably 40% by volume or more, preferably 70% by volume or less, more preferably. It is 60% by volume or less. When the fiber content is at least the above lower limit and at least the above upper limit, the strength of the rib portion can be further increased.

The average thickness of the first layer is preferably 0.1 mm or more, more preferably 0.2 mm or more, preferably 1.0 mm or less, and more preferably 0.8 mm or less. When the average thickness of the first layer is not less than the above lower limit and not more than the above upper limit, the strength of the rib portion can be further increased, and the effect of the present invention can be further exerted.

The average thickness of the second layer is preferably 0.3 mm or more, more preferably 0.45 mm or more, preferably 1.0 mm or less, and more preferably 0.9 mm or less. When the average thickness of the second layer is at least the above lower limit and at least the above upper limit, the strength of the rib portion can be further increased.

When the fibers contained in the first layer are fiber bundles and when the fibers or carbon fibers contained in the second layer are fiber bundles, tension is applied to each fiber constituting the fiber bundle. When tension is applied to the fibers, the distance between the fibers tends to decrease. Therefore, it is preferable that the fiber bundle is treated to increase the distance between the fibers. The fiber bundle preferably contains spacer particles that increase the interfiber distance. By increasing the distance between the fibers in this way, even if a high tension is applied to the fibers, the distance between the fibers is increased in advance, so that the resin can be easily impregnated. Further, even if tension is applied to the fibers, the distance between the fibers is unlikely to be narrowed.

The material of the spacer particles is not particularly limited. The material of the spacer particles is preferably a material in which the spacer particles are not excessively deformed by the temperature and pressure at the time of impregnation.

As the material of the spacer particles, a naphthoxazine resin is preferable. The naphthoxazine resin is easily carbonized and is not excessively softened even when a high temperature or pressure is applied. Therefore, a sufficient distance between fibers is secured, and the impregnation property of the resin is further improved.

The spacer particles are preferably naphthoxazine resin particles or inorganic particles. The spacer particles are preferably inorganic particles, and more preferably inorganic particles excluding metal particles. Regarding the above-mentioned inorganic particles, the colloidal inorganic particle dispersion may be subjected to a treatment such as salting out to aggregate the particles and adjusted to have a size suitable as a spacer.

From the viewpoint of weight reduction of the fiber reinforced member, the resin portion preferably has a void portion, and more preferably contains acrylic particles having a hollow structure. From the viewpoint of increasing the specific rigidity (rigidity per unit weight), the resin portion preferably has no voids, preferably does not contain acrylic particles having a hollow structure, and contains particles having a hollow structure. It is preferable that there is no such thing.

The average particle size of the acrylic particles having a hollow structure is preferably 10 μm or more, more preferably 20 μm or more, preferably 50 μm or less, and more preferably 40 μm or less. When the average particle size is at least the above lower limit, the lightness can be enhanced. When the average particle size is not more than the upper limit, the strength can be increased. The average particle size means a volume average diameter.

Examples of commercially available products of the acrylic particles having a hollow structure include "Advancel EM P501E1" manufactured by Sekisui Chemical Co., Ltd. and "Expansel 980-120" manufactured by Nippon Philite Co., Ltd.

The rib portion has a length direction, a height direction, and a width direction. The length direction, the height direction, and the width direction are orthogonal to each other. The length direction is the direction in which the rib portion extends.

In the cross section along the height direction and the width direction of the rib portion, the shape of the rib portion may be a polygonal shape, a semicircular shape, or a semi-elliptical shape. Examples of the polygonal shape include a triangular shape and a quadrangular shape.

From the viewpoint of increasing the rigidity of the rib portion, the maximum width of the rib portion is preferably 0.3 cm or more, more preferably 0.5 cm or more, preferably 5 cm or less, more preferably 3 cm or less, still more preferably 2 cm or less. Especially preferably, it is 1.8 cm or less.

From the viewpoint of increasing the rigidity of the rib portion, the height of the rib portion is preferably 0.3 cm or more, more preferably 1 cm or more, preferably 10 cm or less, more preferably 7 cm or less, still more preferably 6 cm or less.

The height of the rib portion is the distance from the first surface of the base material portion to the tip of the rib portion.

From the viewpoint of increasing the strength of the rib portion, the length of the rib portion is preferably 10 cm or more, more preferably 50 cm or more, further preferably 1 m or more, particularly preferably 3 m or more, and most preferably 10 m or more. From the viewpoint of facilitating the deformation of the fiber reinforcing member, the length of the rib portion is preferably 100 m or less, more preferably 10 m or less, still more preferably 5 m or less, and particularly preferably 1 m or less.

The rib portion may or may not reach the end of the base material portion in the length direction of the rib portion. It is preferable that the rib portion reaches the end of the base material in the length direction of the rib portion.

In the width direction of the rib portion, the distance between the plurality of adjacent rib portions (distance in which the first surface of the base material portion is exposed) is preferably 1 cm or more, more preferably 2 cm or more, preferably 2 cm or more. It is 10 cm or less, more preferably 6 cm or less.

The rib portion may extend linearly or may extend curvedly. The rib portion may have a portion extending linearly and a portion extending linearly. Further, the rib portion may or may not be provided over the entire surface from one end to the other end of the base material portion.

From the viewpoint of suppressing the variation in strength, it is preferable that the length directions of the plurality of adjacent rib portions are parallel or deviated by 10 ° or less. When the length directions of the plurality of adjacent rib portions are deviated, it is more preferable that the rib portions are deviated by 5 ° or less.

(Other details of fiber reinforced members)
The fiber reinforcing member preferably includes the rib portion protruding from the first surface of the base material portion. The fiber reinforcing member may include a rib portion protruding from a second surface opposite to the first surface of the base material portion.

The fiber reinforcing member is preferably in the form of a sheet.

The fiber reinforced member may be curved, may not be curved, or may have a curved portion. The fiber reinforced member may have another shape.

Manufacturing method of fiber reinforced plastic:
When a thermoplastic resin is used as the resin contained in the resin portion, the molding method of the fiber reinforcing member includes (1) a method of performing roll forming molding in a state where the resin is softened by heating, and (2) extrusion molding. Examples thereof include a method of performing the process, and (3) a method of performing bending after molding.

Since a fiber-reinforced member having a large length direction can be preferably manufactured, the fiber-reinforced member is preferably manufactured by extrusion molding.

Use:
By using the fiber reinforcing member provided with the rib portion, the rib structure can be imparted to the surface of various structures in a predetermined direction. In particular, the strength can be remarkably improved with respect to the extending direction of the rib portion. When it is desired to increase the strength in the direction in which the rib portion extends and the direction in which the rib portion deviates, for example, a plate material can be fitted. Free reinforcement is possible based on the structure of the rib portion provided by the fiber reinforcing member.

Further, in the present invention, by making the plurality of rib portions parallel (including substantially parallel), the strength in that direction can be improved. In some cases, it can be applied and developed as a muscle in the form of one rib portion. In this case, the fiber reinforcing member having a plurality of rib portions may be cut to obtain a fiber reinforcing member having one rib portion. Even if the fiber reinforced member has one rib portion, the fiber reinforced member can be made into another streak (metal streak, fiber) by impregnating the resin-unimpregnated fiber portion or the resin partially impregnated fiber portion with a resin or an adhesive. It can be used by firmly attaching it to reinforced plastic bars, etc.).

The fiber reinforced member can be attached to the attachment target portion and used in various applications. Examples of applications of the fiber reinforced members include wind turbine blades, aircraft, ships, vehicles, floorboards for civil engineering and construction, roofing materials, pipes, and the like. The fiber reinforcing member is preferably used for a wind turbine blade, and specifically, is preferably used as a reinforcing member for a wind turbine blade. Further, the fiber reinforcing member can also be used as a reinforcing member of a pipeline for natural gas.

(Joint structure)
The joining structure according to the present invention includes a first fiber reinforcing member, a second fiber reinforcing member, and a joining member. In the joining structure according to the present invention, the first fiber reinforcing member and the second fiber reinforcing member are joined by the joining member. In the bonded structure according to the present invention, the first fiber reinforcing member and the second fiber reinforcing member are each formed of the fiber reinforcing member described above.

3A and 3B are a cross-sectional view and a plan view schematically showing a joint structure according to the first embodiment of the present invention. FIG. 3 (a) is a cross-sectional view taken along the line I-I of FIG. 3 (b).

The joining structure 5 shown in FIG. 3 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, and a joining member 4.

The first fiber reinforcing member 1X includes a base material portion 2X and a plurality of rib portions 3X. The rib portion 3X protrudes from the first surface 2Xa of the base material portion 2X. The rib portion 3X is a resin portion 13X containing no fiber, a second layer 12X containing carbon fiber and a thermoplastic resin, and a first layer 11X which is a resin partially impregnated fiber portion partially impregnated with the resin. And have.

The second fiber reinforcing member 1Y includes a base material portion 2Y and a plurality of rib portions 3Y. The rib portion 3Y protrudes from the first surface 2Y of the base material portion 2Y. The rib portion 3Y has a resin portion that does not contain fibers, a second layer that contains carbon fibers and a thermoplastic resin, and a first layer that is a resin partially impregnated fiber portion that is partially impregnated with the resin. ..

The first fiber reinforcing member 1X and the second fiber reinforcing member 1Y each have the same structure as the fiber reinforcing member 1 shown in FIG.

The first fiber reinforced member 1X and the second fiber reinforced member 1Y are joined by the joining member 4. In the joint structure 5, the end face of the first fiber reinforced member 1X and the end face of the second fiber reinforced member 1Y are in contact with each other. The joining member 4 is arranged on the surface of the first layer 11X of the first fiber reinforcing member 1X, and is arranged on the surface of the first layer of the second fiber reinforcing member 1Y. The joining member 4 is arranged so as to reach both the surfaces of the first layer 11X of the first fiber reinforcing member 1X and the surface of the first layer of the second fiber reinforcing member 1Y. ing. The joining member 4 is arranged so as to reach the tip surface and side surface of the rib portion 3X of the first fiber reinforcing member 1X and the tip surface and side surface of the rib portion 3Y of the second fiber reinforcing member 1Y. The joining member 4 is arranged so as to reach the base material portion 2X of the first fiber reinforcing member 1X and the base material portion 2Y of the second fiber reinforcing member 1Y.

4 (a) and 4 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a second embodiment of the present invention. FIG. 4 (a) is a cross-sectional view taken along the line I-I of FIG. 4 (b).

The joint structure 5A includes a first fiber reinforced member 1X, a second fiber reinforced member 1Y, a joint member 4, and a fixing member 6. The joint structure 5 shown in FIG. 3 and the joint structure 5A shown in FIG. 4 differ only in the presence or absence of the fixing member.

The fixing member 6 is a member used to more firmly fix the first fiber reinforcing member 1X and the second fiber reinforcing member 1Y. The fixing member 6 is arranged outside the joining member 4. The fixing member 6 is arranged so as to cover the joining member 4. In the present embodiment, the fixing member 6 is a resin member and a foaming member. The fixing member 6 has a shape in which the shape of the rib portion is cut out from the rectangular parallelepiped. One fixing member 6 is used for one joining member 4. By arranging the fixing member 6 on the outside of the joining member 4, the joining structure 5A including the fixing member 6 can be obtained. The joint structure 5A provided with the fixing member 6 can reduce the gap between the joint member 4 and the first layer as compared with the joint structure 5 without the fixing member, and can increase the joint strength. In addition, the physical properties of the bonded structure can be improved.

5 (a) and 5 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a third embodiment of the present invention. 5 (a) is a cross-sectional view taken along the line I-I of FIG. 5 (b).

The joining structure 5B shown in FIG. 5 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, and a joining member 4B. The joining structure 5 shown in FIG. 3 and the joining structure 5B shown in FIG. 5 have different joint directions of the first fiber reinforcing member 1X and the second fiber reinforcing member 1Y.

The first fiber reinforced member 1X and the second fiber reinforced member 1Y are joined by the joining member 4B. In the joint structure 5B, the end face of the first fiber reinforced member 1X and the end face of the second fiber reinforced member 1Y are in contact with each other. In the joint structure 5B, the end face of the first fiber reinforcing member 1X in the direction orthogonal to the length direction of the rib portion 3X and the end face of the second fiber reinforcing member 1Y in the length direction of the rib portion 3Y come into contact with each other. doing. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3Y of the second fiber reinforcing member 1Y is 90 °. The joining member 4B is arranged on the surface of the first layer 11X of the first fiber reinforcing member 1X, and is arranged on the surface of the first layer 11Y of the second fiber reinforcing member 1Y. .. The outer shape of the joining member 4B in a plan view is rectangular. The joining member 4B is arranged so as to reach both the surfaces of the first layer 11X of the first fiber reinforcing member 1X and the surface of the first layer 11Y of the second fiber reinforcing member 1Y. Has been done. The joining member 4B is arranged so as to reach the tip surface and side surface of the rib portion 3X of the first fiber reinforcing member 1X and the tip surface and side surface of the rib portion 3Y of the second fiber reinforcing member 1Y. The joining member 4B is arranged so as to reach the base material portion 2X of the first fiber reinforcing member 1X and the base material portion 2Y of the second fiber reinforcing member 1Y.

6 (a) and 6 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a fourth embodiment of the present invention. FIG. 6 (a) is a cross-sectional view taken along the line I-I of FIG. 6 (b).

The joining structure 5C shown in FIG. 6 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a joining member 4C, and a fixing member 6C. The joint structure 5B shown in FIG. 5 and the joint structure 5C shown in FIG. 6 differ only in the presence or absence of the fixing member.

The fixing member 6C is arranged outside the joining member 4C. The fixing member 6C is arranged so as to cover the joining member 4C. In the present embodiment, the fixing member 6C is a resin member and a foamed member. One fixing member 6C is used for one joining member 4C. By arranging the fixing member 6C on the outside of the joining member 4C, the joining structure 5C including the fixing member 6C can be obtained. The joint structure 5C provided with the fixing member 6C can reduce the gap between the joint member 4C and the first layer as compared with the joint structure 5B without the fixing member, and can increase the joint strength. In addition, the physical properties of the bonded structure can be improved.

The shapes of the joining members 4B and 4C may be T-shaped as shown in FIG. 7 and the like described later.

FIG. 7 is a plan view schematically showing a joint structure according to a fifth embodiment of the present invention.

The joining structure 5D shown in FIG. 7 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, and a joining member 4D. Only the size and shape of the joining member are different between the joining structure 5B shown in FIG. 5 and the joining structure 5D shown in FIG. 7.

The outer shape of the joining member 4D in a plan view is an octagonal shape. The shape of the joining member 4D in a plan view is T-shaped.

FIG. 8 is a plan view schematically showing the joint structure according to the sixth embodiment of the present invention.

The joining structure 5E shown in FIG. 8 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a joining member 4E, and a fixing member 6E. The joint structure 5D shown in FIG. 7 and the joint structure 5E shown in FIG. 8 differ only in the presence or absence of the fixing member.

The fixing member 6E is arranged outside the joining member 4E. The fixing member 6E is arranged so as to cover the joining member 4E.

FIG. 9 is a plan view schematically showing the joint structure according to the seventh embodiment of the present invention.

The bonding structure 5F shown in FIG. 9 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a third fiber reinforcing member 1Z, and a bonding member 4F.

The first fiber reinforcing member 1X, the second fiber reinforcing member 1Y, and the third fiber reinforcing member 1Z are joined by the joining member 4F. In the joint structure 5F, the end face of the first fiber reinforced member 1X, the end face of the second fiber reinforced member 1Y, and the end face of the third fiber reinforced member 1Z are in contact with each other. In the joint structure 5F, the end face of the first fiber reinforced member 1X in the length direction of the rib portion 3X and the end face of the third fiber reinforced member 1Z in the length direction of the rib portion 3Z are in contact with each other. In the joint structure 5F, the end face of the first fiber reinforcing member 1X in the direction orthogonal to the length direction of the rib portion 3X and the end face of the second fiber reinforcing member 1Y in the length direction of the rib portion 3Y come into contact with each other. doing. In the joint structure 5F, the end face of the third fiber reinforcing member 1Z in the direction orthogonal to the length direction of the rib portion 3Z and the end face of the second fiber reinforcing member 1Y in the length direction of the rib portion 3Y come into contact with each other. doing. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3Y of the second fiber reinforcing member 1Y is 90 °. The angle formed by the length direction of the rib portion 3Z of the third fiber reinforcing member 1Z and the length direction of the rib portion 3Y of the second fiber reinforcing member 1Y is 90 °. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3Z of the third fiber reinforcing member 1Z is 0 °. The joining member 4F is arranged on the surface of the first layer of the first fiber reinforcing member 1X, is arranged on the surface of the first layer of the second fiber reinforcing member 1Y, and is the first. 3 is arranged on the surface of the first layer of the fiber reinforced member 1Z. The outer shape of the joining member 4F in a plan view is an octagonal shape. The shape of the joining member 4F in a plan view is T-shaped. The joining member 4F is on the surface of the first layer of the first fiber reinforcing member 1X, on the surface of the first layer of the second fiber reinforcing member 1Y, and the first of the third fiber reinforcing member 1Z. It is arranged so as to reach on these three surfaces with and on the surface of the layer. The joining member 4F includes the tip surface and side surface of the rib portion 3X of the first fiber reinforcing member 1X, the tip surface and side surface of the rib portion 3Y of the second fiber reinforcing member 1Y, and the rib of the third fiber reinforcing member 1Z. It is arranged so as to reach the front end surface and the side surface of the portion 3Z. The joining member 4F reaches the base material portion 2X of the first fiber reinforcing member 1X, the base material portion 2Y of the second fiber reinforcing member 1Y, and the base material portion 2Z of the third fiber reinforcing member 1Z. It is arranged.

FIG. 10 is a plan view schematically showing a joint structure according to an eighth embodiment of the present invention.

The bonding structure 5G shown in FIG. 10 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a third fiber reinforcing member 1Z, a bonding member 4G, and a fixing member 6G. The joint structure 5F shown in FIG. 9 and the joint structure 5G shown in FIG. 10 differ only in the presence or absence of the fixing member.

The fixing member 6G is arranged outside the joining member 4G. The fixing member 6G is arranged so as to cover the joining member 4G.

11 (a) and 11 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a ninth embodiment of the present invention. 11 (a) is a cross-sectional view taken along the line I-I of FIG. 11 (b).

The bonding structure 5H shown in FIG. 11 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a third fiber reinforcing member 1Z, and a bonding member 4H.

The first fiber reinforcing member 1X does not have a portion on the upper surface where the base material portion 2X is exposed. The second fiber reinforced member 1Y has a portion on the upper surface where the base material portion 2Y is exposed. The third fiber reinforced member 1Z has a portion on the upper surface where the base material portion 2Z is exposed.

The first fiber reinforcing member 1X, the second fiber reinforcing member 1Y, and the third fiber reinforcing member 1Z are joined by the joining member 4H. In the joint structure 5H, the end face of the first fiber reinforced member 1X and the end face of the second fiber reinforced member 1Y are in contact with each other, and the end face of the first fiber reinforced member 1X and the third fiber reinforced member 1X are in contact with each other. The end face of the member 1Z is in contact with the end face. In the joint structure 5H, the end face of the first fiber reinforcing member 1X in the direction orthogonal to the length direction of the rib portion 3X and the end face of the third fiber reinforcing member 1Z in the direction orthogonal to the length direction of the rib portion 3Z. Are in contact with each other. In the joint structure 5H, the end face of the first fiber reinforcing member 1X in the direction orthogonal to the length direction of the rib portion 3X and the end face of the second fiber reinforcing member 1Y in the length direction of the rib portion 3Y come into contact with each other. doing. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3Y of the second fiber reinforcing member 1Y is 90 °. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3Z of the third fiber reinforcing member 1Z is 90 °. The angle formed by the length direction of the rib portion 3Y of the second fiber reinforcing member 1Y and the length direction of the rib portion 3Z of the third fiber reinforcing member 1Z is 0 °. The joining member 4H is arranged on the surface of the first layer of the first fiber reinforcing member 1X, is arranged on the surface of the first layer of the second fiber reinforcing member 1Y, and is the first. 3 is arranged on the surface of the first layer of the fiber reinforced member 1Z. The outer shape of the joining member 4H in a plan view is rectangular. The joining member 4H is on the surface of the first layer of the first fiber reinforcing member 1X, on the surface of the first layer of the second fiber reinforcing member 1Y, and the first of the third fiber reinforcing member 1Z. It is arranged so as to reach on these three surfaces with and on the surface of the layer. The joining member 4H includes a tip surface of the rib portion 3X of the first fiber reinforcing member 1X, a tip surface and a side surface of the rib portion 3Y of the second fiber reinforcing member 1Y, and a rib portion 3Z of the third fiber reinforcing member 1Z. It is arranged so as to reach the tip surface and the side surface of the. The joining member 4H is arranged so as to reach the base material portion 2Y of the second fiber reinforced member 1Y and the base material portion 2Z of the third fiber reinforced member 1Z.

12 (a) and 12 (b) are a cross-sectional view and a plan view schematically showing a joint structure according to a tenth embodiment of the present invention. 12 (a) is a cross-sectional view taken along the line I-I of FIG. 12 (b).

The bonding structure 5I shown in FIG. 12 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a third fiber reinforcing member 1Z, a bonding member 4I, and a fixing member 6I. The joint structure 5H shown in FIG. 11 and the joint structure 5I shown in FIG. 12 differ only in the presence or absence of the fixing member.

The fixing member 6I is arranged outside the joining member 4I. The fixing member 6I is arranged so as to cover the joining member 4I.

The shapes of the joining members 4H and 4I may be cross-shaped, as shown in FIGS. 13 and 14 described later.

FIG. 13 is a plan view schematically showing the joint structure according to the eleventh embodiment of the present invention.

The bonding structure 5J shown in FIG. 13 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a third fiber reinforcing member 1Z, a fourth fiber reinforcing member 1W, and a bonding member 4J. To be equipped.

The first fiber reinforcing member 1X does not have a portion on the upper surface where the base material portion 2X is exposed. The second fiber reinforced member 1Y has a portion on the upper surface where the base material portion 2Y is exposed. The third fiber reinforced member 1Z has a portion on the upper surface where the base material portion 2Z is exposed. The fourth fiber reinforced member 1W does not have a portion on the upper surface where the base material portion is exposed.

The first fiber reinforcing member 1X, the second fiber reinforcing member 1Y, the third fiber reinforcing member 1Z, and the fourth fiber reinforcing member 1W are joined by the joining member 4J. In the joint structure 5J, the end face of the first fiber reinforced member 1X and the end face of the second fiber reinforced member 1Y are in contact with each other, and the end face of the first fiber reinforced member 1X and the third fiber reinforced member 1X are in contact with each other. The end face of the member 1Z is in contact with each other, and the end face of the first fiber reinforced member 1X and the end face of the fourth fiber reinforced member 1W are in contact with each other. In the joint structure 5J, the end face of the first fiber reinforcing member 1X in the direction orthogonal to the length direction of the rib portion 3X and the end face of the second fiber reinforcing member 1Y in the length direction of the rib portion 3Y come into contact with each other. doing. In the joint structure 5J, the end face of the first fiber reinforcing member 1X in the direction orthogonal to the length direction of the rib portion 3X and the end face of the third fiber reinforcing member 1Z in the length direction of the rib portion 3Z come into contact with each other. doing. In the joint structure 5J, the end face of the first fiber reinforcing member 1X in the length direction of the rib portion 3X and the end face of the fourth fiber reinforcing member 1W in the length direction of the rib portion 3W are in contact with each other. In the joint structure 5J, the end face of the fourth fiber reinforcing member 1W in the direction orthogonal to the length direction of the rib portion 3W and the end face of the second fiber reinforcing member 1Y in the length direction of the rib portion 3Y come into contact with each other. doing. In the joint structure 5J, the end face of the fourth fiber reinforcing member 1W in the direction orthogonal to the length direction of the rib portion 3W and the end face of the third fiber reinforcing member 1Z in the length direction of the rib portion 3Z come into contact with each other. doing. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3Y of the second fiber reinforcing member 1Y is 90 °. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3Z of the third fiber reinforcing member 1Z is 90 °. The angle formed by the length direction of the rib portion 3X of the first fiber reinforcing member 1X and the length direction of the rib portion 3W of the fourth fiber reinforcing member 1W is 0 °. The joining member 4J is arranged on the surface of the first layer of the first fiber reinforcing member 1X, and is arranged on the surface of the first layer of the second fiber reinforcing member 1Y. It is arranged on the surface of the first layer of the fiber reinforcing member 1Z, and is arranged on the surface of the first layer of the fourth fiber reinforcing member 1W. The outer shape of the joining member 4J in a plan view is a dodecagonal shape. The shape of the joining member 4J in a plan view is a cross shape. The joining member 4J is on the surface of the first layer of the first fiber reinforcing member 1X, on the surface of the first layer of the second fiber reinforcing member 1Y, and the first of the third fiber reinforcing member 1Z. It is arranged so as to reach on these four surfaces, that is, on the surface of the layer and on the surface of the first layer of the fourth fiber reinforcing member 1W. The joining member 4J includes a tip surface of the rib portion 3X of the first fiber reinforcing member 1X, a tip surface and a side surface of the rib portion 3Y of the second fiber reinforcing member 1Y, and a rib portion 3Z of the third fiber reinforcing member 1Z. It is arranged so as to reach the tip surface and the side surface of the fourth fiber reinforced member 1W and the tip surface of the rib portion 3X of the fourth fiber reinforced member 1W. The joining member 4J is arranged so as to reach the base material portion 2Y of the second fiber reinforced member 1Y and the base material portion 2Z of the third fiber reinforced member 1Z.

FIG. 14 is a plan view schematically showing a joint structure according to a twelfth embodiment of the present invention.

The bonding structure 5K shown in FIG. 14 includes a first fiber reinforcing member 1X, a second fiber reinforcing member 1Y, a third fiber reinforcing member 1Z, a bonding member 4K, and a fixing member 6K. The joint structure 5J shown in FIG. 13 and the joint structure 5K shown in FIG. 14 differ only in the presence or absence of the fixing member.

The fixing member 6K is arranged outside the joining member 4K. The fixing member 6K is arranged so as to cover the joining member 4K.

In the above-mentioned joint structure, one fixing member may be used for a plurality of joint members. In the above-mentioned joint structure, a weight stone may be arranged on the upper surface of the fixing member (the surface opposite to the first surface of the base material portion). In this case, the gap between the joining member and the first layer can be considerably reduced, the joining strength can be further increased, and the physical characteristics of the joining structure can be further improved.

Further, the joint structure according to the present invention may include a third fiber reinforced member. The second fiber reinforcing member and the third fiber reinforcing member may be joined by the joining member, and the third fiber reinforcing member may be formed by the fiber reinforcing member described above.

Further, the bonded structure according to the present invention may include an nth fiber reinforcing member and an n + 1th fiber reinforcing member. The nth fiber reinforcing member and the n + 1 fiber reinforcing member are joined by the joining member, and the nth fiber reinforcing member and the n + 1 fiber reinforcing member are bonded to each other. It may be formed of members. n represents an integer of 3 or more. n may be an integer of 4 or more, an integer of 5 or more, or an integer of 10 or more. n may be an integer of 10000 or less, an integer of 1000 or less, or an integer of 100 or less.

Further, in the bonded structure according to the present invention, the fiber reinforcing member may or may not have a portion where the base material portion is exposed on the upper surface. The first fiber reinforced member may or may not have a portion on the upper surface where the base material portion is exposed. The second fiber reinforced member may or may not have a portion on the upper surface where the base material portion is exposed. The third fiber reinforced member may or may not have a portion on the upper surface where the base material portion is exposed. The fourth fiber reinforced member may or may not have a portion on the upper surface where the base material portion is exposed.

<Joining member>
The joining member preferably contains a resin. From the viewpoint of joining the fiber-reinforced members more firmly, the joining member is a resin partially impregnated fiber portion partially impregnated with resin or a resin-impregnated fiber portion entirely impregnated with resin. A fiber reinforced sheet is particularly preferable.

The fiber reinforced sheet is a resin partially impregnated fiber portion that is partially impregnated with resin or a resin partially impregnated fiber portion that is entirely impregnated with resin. The resin partially impregnated fiber portion may be a resin partially impregnated fiber bundle portion. The resin-impregnated fiber portion may be a resin-impregnated fiber bundle portion.

The fiber reinforced sheet contains a resin and a fiber. When the fiber-reinforced sheet is the resin portion-impregnated fiber portion, the fiber-reinforced sheet preferably has a portion partially impregnated with the resin in the thickness direction of the fiber-reinforced sheet. The fiber-reinforced sheet preferably has a resin-impregnated portion and a resin-impregnated portion in the thickness direction of the fiber-reinforced sheet.

The fiber reinforced sheet contains a resin. The resin contained in the fiber-reinforced sheet and the resin contained in the first layer may be the same or different.

The resin that may be contained in the joining member and the resin contained in the fiber reinforced sheet may be a thermoplastic resin or a cured product of a thermosetting resin, respectively. Only one type of resin may be used and the resin contained in the fiber reinforced sheet may be used in combination, or two or more types may be used in combination.

Examples of the thermoplastic resin include polyolefin resins, polyamide resins, polycarbonate resins, polystyrene resins, polyester resins and the like. Examples of the polyolefin resin include polyethylene resin and polypropylene resin. Examples of the above-mentioned polyamide resin include aliphatic polyamide resins, and specific examples thereof include polyamide 66, polyamide 6, and polyamide 12. Examples of the polystyrene resin include styrene polymer resin, AS resin, ABS resin and the like. Examples of the polyester resin include aliphatic polyester resins, and specific examples thereof include polylactic acid resins.

Examples of the thermosetting resin include unsaturated polyester resins, vinyl ester resins, epoxy resins and phenolic resins.

From the viewpoint of increasing the strength of the bonded structure, the resin contained in the fiber reinforced sheet is preferably a cured product of a thermosetting resin. From the viewpoint of improving the impregnation property, the thermosetting resin is preferably an unsaturated polyester resin, a vinyl ester resin, or an epoxy resin. That is, the resin contained in the fiber-reinforced sheet is preferably a cured product of an unsaturated polyester resin, a cured product of a vinyl ester resin, or a cured product of an epoxy resin.

The fiber reinforced sheet contains fibers. The fibers contained in the fiber-reinforced sheet and the fibers contained in the first layer may be the same or different.

Examples of the fiber contained in the fiber reinforced sheet include glass fiber, carbon fiber and aramid fiber. From the viewpoint of more effectively exerting the effects of the present invention, the fibers contained in the fiber-reinforced sheet are preferably glass fibers or carbon fibers, and more preferably glass fibers.

The average fiber diameter of the fibers contained in the fiber reinforced sheet is preferably 4 μm or more, more preferably 6 μm or more, preferably 110 μm or less, and more preferably 100 μm or less. The average fiber diameter is a number average fiber diameter. The average fiber diameter is obtained by measuring the fiber diameter (maximum diameter) of 10 or more arbitrary fibers and averaging the measured fiber diameters.

The form of the fiber contained in the fiber reinforced sheet is preferably UD (Uni-Direction), woven fabric, or non-woven fabric. UD is a form in which fibers are aligned in one direction. The UD, the woven fabric, or the non-woven fabric is preferably made of glass fiber. That is, the fiber-reinforced sheet preferably contains a UD made of glass fibers, a woven fabric made of glass fibers, or a non-woven fabric made of glass fibers. In this case, the effect of the present invention can be exhibited even more effectively.

The basis weight of the woven fabric or the non-woven fabric contained in the fiber-reinforced sheet is preferably 30 g / m ² or more, preferably 400 g / m ² or less. When the basis weight is not more than the above lower limit, the strength of the fiber reinforced sheet is further increased. When the basis weight is not more than the above upper limit, the impregnation property of the resin becomes even higher.

The thickness of the fiber reinforced sheet is preferably 0.1 mm or more, more preferably 0.2 mm or more, preferably 2 mm or less, and more preferably 1 mm or less. When the thickness is not less than the above lower limit and not more than the above upper limit, the strength of the fiber reinforced sheet can be further increased.

<Fixing member>
Examples of the fixing member include a resin member, a metal member, and a wood member. Two or more types of members may be used as the fixing member. The fixing member is preferably a resin member, a metal member, or a wood member.

The fixing member is preferably a resin member, and more preferably a foamed resin member. In this case, the weight can be reduced while further increasing the joint strength. When the fixing member is a resin member, the fixing member (resin member) and the joining member may or may not be integrated. When the fixing member (resin member) and the joining member are integrated, the joining strength can be further increased. Examples of the method of integrating the fixing member (resin member) and the joining member include a method of using an adhesive.

The fixing member is preferably a metal member. In this case, it is preferable that the fixing member (metal member) is removable from the joining member. In this case, by removing the fixing member from the joining structure provided with the fixing member, a joining structure without the fixing member can be easily obtained.

The fixing member preferably has a resin member and a metal member. In this case, it is preferable that the inner surface of the fixing member is made of a metal member. It is preferable that the surface of the fixing member on the joint member side is made of a metal member. Further, in this case, it is preferable that the fixing member (fixing member having a resin member and a metal member) is removable from the joining member.

Examples of the resin contained in the resin member include polyolefin resin, vinyl chloride resin, polyurethane resin, polystyrene resin and the like.

Examples of the metal contained in the metal member include iron, aluminum, and titanium.

The bonded structure can be manufactured as follows.

The end face of the first fiber reinforced member is brought into contact with the end face of the second fiber reinforced member.

Next, as a first method, an adhesive is applied to the surface of the first fiber-reinforced member (first layer) and the surface of the second fiber-reinforced member (first layer), respectively, or An adhesive is applied to the surface of the fiber reinforced sheet. An adhesive is applied to the surface of the first fiber reinforced member (first layer), the surface of the second fiber reinforced member (first layer), and the surface of the fiber reinforced sheet. May be good. Next, the fiber reinforced sheet is arranged on the surface of the first layer of the first fiber reinforced member and on the surface of the first layer of the second fiber reinforced member. Then, joining is performed with an adhesive. In this case, the adhesive may be impregnated in the first layer of the fiber reinforcing member. As a second method, a joining member (fiber reinforced sheet or the like) containing a resin on the surface (first layer) of the first fiber reinforced member and the surface (first layer) of the second fiber reinforced member, respectively. ) Is placed. Then, the resin or the like contained in the joining member is used for joining. In this case, the resin contained in the joining member may be impregnated in the first layer of the fiber reinforcing member.

The joining form of the first and second fiber reinforced members and the joining member in the joining structure is preferably a joining form using an adhesive.

Examples of the adhesive include resins and the like. Examples of the adhesive include unsaturated polyester resins, vinyl ester resins, and epoxy resins.

The adhesive may have thermosetting properties. The heating temperature of the adhesive is appropriately set in consideration of thermosetting property. From the viewpoint of suppressing the shape change of the rib portion and the like, the heating temperature is preferably 120 ° C. or lower.

Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to the following examples.

I prepared the following. In the following Examples 1 to 4, Comparative Example 1 and Reference Example A, a fiber reinforcing member provided with a rib portion was produced.

(Material for fiber reinforced plastic)
<Material of base material>
Unsaturated polyester resin ("4007A" manufactured by Japan U-Pica Company)
Glass mat (“GF mat AMC450A” manufactured by Nitto Boseki Co., Ltd., basis weight 450 g / m ² )
Glass roving cloth (“GF roving cloth WR570C” manufactured by Nitto Boseki Co., Ltd., basis weight 570 g / m ² )

The glass mat and the glass roving cloth were superposed to obtain a fiber sheet having a five-layer structure of layers A to E. In this fiber sheet, the layer A is made of a glass mat, the layer B is made of a glass roving cloth, and the layers C to E are made of a glass mat. The obtained fiber sheet was partially impregnated with an unsaturated polyester resin in the thickness direction. Of the layers A and E, the layer A side is the side on which the rib portion described later is arranged.

<Material of resin part in rib part>
A mixture of 99 parts by weight of polypropylene resin ("E111G" manufactured by Prime Polymer Co., Ltd.) and 1 part by weight of acrylic particles having a hollow structure ("Advancel EM P501E1" manufactured by Sekisui Chemical Co., Ltd.) was used as a material for the resin part. ..

<Material of the first layer in the rib part>
Polypropylene resin ("E111G" manufactured by Prime Polymer Co., Ltd.)
Non-woven fabric A (“SMK-048” manufactured by Olivest, non-woven fabric composed of glass fiber ^{, grain size 48 g / m 2} , thickness 0.357 mm)
Non-woven fabric B (“SYS-095” manufactured by Olivest, non-woven fabric composed of glass fiber, basis weight 95 g / m ² , thickness 0.733 mm)

<Material of the second layer in the rib part>
CF obtained by impregnating carbon fiber (UD) (“TC-35 24K” manufactured by Taiwan Plastics Co., Ltd., PAN-based carbon fiber bundle, number of filaments: 24,000) with polypropylene resin (“J108M” manufactured by Prime Polymer Co., Ltd.). Prepreg was used as the material for the second layer.

(Joint member (fiber reinforced sheet) and adhesive material)
Unsaturated polyester resin ("4007A" manufactured by Japan U-Pica Company)
Glass mat (“GF mat AMC450A” manufactured by Nitto Boseki Co., Ltd., basis weight 450 g / m ² )
Glass roving cloth (“GF roving cloth WR570C” manufactured by Nitto Boseki Co., Ltd., basis weight 570 g / m ² )

(Example 1)
Fabrication of fiber reinforced members:
Each material was molded to produce a plurality of fiber-reinforced members having the structures shown in Table 1 and FIG.

Fabrication of bonded structure:
A glass mat was impregnated with an unsaturated polyester resin to obtain a fiber reinforced sheet. The obtained fiber reinforced sheet was laminated on the surface of the rib portion and the base material portion of the obtained fiber reinforced member. In this way, a bonded structure in which the fiber-reinforced members were joined to each other was obtained by the fiber-reinforced sheet.

(Examples 2 and 3)
A fiber-reinforced member and a bonded structure were produced in the same manner as in Example 1 except that the material of the fiber-reinforced member was changed as shown in Table 2.

(Example 4)
Fabrication of fiber reinforced members:
A fiber reinforcing member was produced in the same manner as in Example 1.

Fabrication of fixing member:
A resin material containing a vinyl chloride resin was foam-molded to obtain a rectangular parallelepiped foamed resin member. One surface of the obtained rectangular parallelepiped foamed resin member was cut out so as to correspond to the shape of the rib portion to prepare a fixing member.

Fabrication of bonded structure:
A fiber-reinforced sheet was obtained by impregnating a glass roving cloth with an unsaturated polyester resin. The obtained fiber reinforced sheet was laminated on the surface of the rib portion and the base material portion of the obtained fiber reinforced member. Next, the fixing member and the rib portion were fitted so as to cover the surface of the joining member, and the fixing member was arranged outside the joining member. Next, a weight stone was placed on the surface of the fixing member. The resin in the fiber reinforced sheet was cured to obtain a bonded structure in which the fiber reinforced members were joined to each other by the fiber reinforced sheet.

(Comparative Example 1)
A fiber-reinforced member and a bonded structure were produced in the same manner as in Example 1 except that the material of the fiber-reinforced member was changed as shown in Table 1 and the first layer was not formed.

(Reference example A)
A fiber-reinforced member was produced in the same manner as in Example 1 except that the material of the fiber-reinforced member was changed as shown in Table 3 and the first layer was not formed.

(evaluation)
(1) Flexural rigidity The obtained joint structure was cut into a length of 40 mm and a width of 480 mm. Using a precision universal testing machine ("Autograph AG-X" manufactured by Shimadzu Corporation), install the cut joint structure so that the joint on the base material side and the central indenter (radius 75 mmR) are in contact with each other. The flexural rigidity was measured under the conditions of a test speed of 5 mm / min and a distance between the lower fulcrums of 400 mm. Similarly, the flexural rigidity of the fiber-reinforced member produced in Reference Example A was measured. Moreover, the ratio of the bending rigidity of each Example and the comparative example was calculated when the bending rigidity of Reference Example A was 100%.

(2) Maximum point load The obtained joint structure is subjected to a bending test in the same manner as in "(1) Flexural rigidity" above, and the load at the time of breaking of the joint portion of the joint structure is measured, and the maximum point load is obtained. And said. Similarly, for the fiber-reinforced member produced in Reference Example A, the load at break of the fiber-reinforced member was measured and used as the maximum point load. Further, the ratio of the maximum point load of each Example and the comparative example was obtained when the maximum point load of Reference Example A was set to 100%.

The configurations and results are shown in Tables 1 to 3.

I prepared the following. In the following Examples 5 to 8 and Comparative Example 2, a fiber reinforcing member having no rib portion was produced.

(Material for fiber reinforced plastic)
<Material of the first layer>
Polypropylene resin ("E111G" manufactured by Prime Polymer Co., Ltd.)
Non-woven fabric A (“SMK-048” manufactured by Olivest, non-woven fabric composed of glass fiber ^{, grain size 48 g / m 2} , thickness 0.357 mm)
Non-woven fabric B (“SYS-095” manufactured by Olivest, non-woven fabric composed of glass fiber, basis weight 95 g / m ² , thickness 0.733 mm)
Glass roving cloth (“GF roving cloth WR570C” manufactured by Nitto Boseki Co., Ltd., basis weight 570 g / m ² )

<Material of the second layer>
As the material of the second layer of Examples 5 to 8 and Comparative Example 2, carbon fiber (UD) (“TC-35 24K” manufactured by Taiwan Plastics Co., Ltd., PAN-based carbon fiber bundle, number of filaments: 24,000) and polypropylene A CF prepreg obtained by impregnating with a resin (“J108M” manufactured by Prime Polymer Co., Ltd.) was used.

(Materials for joining members and adhesives)
Unsaturated polyester resin ("4007A" manufactured by Japan U-Pica Company)
Aluminum plate (A1050)

(Example 5)
Fabrication of fiber reinforced members:
Each material was molded to produce a plurality of fiber reinforced members (fiber reinforced members having no rib portion) having the structures shown in Table 4 and FIG.

Preparation of tensile strength measurement sample:
A glass mat was impregnated with an unsaturated polyester resin to obtain a fiber reinforced sheet (length 100 mm × width 25 mm). The obtained fiber reinforced sheet was laminated on the surface of the obtained fiber reinforced member (length 100 mm × width 25 mm), and a tensile strength measurement sample was obtained via a bonding layer having a size of length 25 mm × width 25 mm. rice field.

(Examples 6 to 8)
A fiber-reinforced member and a tensile strength measurement sample were prepared in the same manner as in Example 5, except that the material of the fiber-reinforced member and the material of the joining member were changed as shown in Table 4.

(Comparative Example 2)
A fiber reinforcing member and a tensile strength measurement sample were prepared in the same manner as in Example 5 except that the first layer of the fiber reinforcing member was not formed.

(evaluation)
(1) Tensile strength Using a precision universal testing machine ("Autograph AG-X" manufactured by Shimadzu Corporation), grasp both ends of the obtained tensile strength measurement sample (length 175 mm x width 25 mm) in the length direction. It was set at an interval of 130 mm. Then, a load was applied at a test speed of 1 mm / min until the tensile strength measurement sample broke. The load at the time of breaking of the tensile strength measurement sample was defined as the maximum point load, and the stress value when the maximum point load was obtained was defined as the tensile strength.

The configuration and results are shown in Table 4.

1,1A ... Fiber reinforced member 1W ... Fourth fiber reinforced member 1X ... First fiber reinforced member 1Y ... Second fiber reinforced member 1Z ... Third fiber reinforced member 2,2X, 2Y, 2Z ... Base material 2a, 2Xa, 2Ya ... 1st surface 3,3W, 3X, 3Y, 3Z ... Rib part 4,4B, 4C, 4D, 4E, 4F, 4G, 4H, 4I, 4J, 4K ... Joining member 5,5A, 5B, 5C, 5D, 5E, 5F, 5G, 5H, 5I, 5J, 5K ... Joint structure 6,6C, 6E, 6G, 6I, 6K ... Fixing member 11, 11A, 11X, 11Y, 11Z ... First Layers 12, 12A, 12X, 12Y, 12Z ... Second layer 13, 13X, 13Y, 13Z ... Resin part 21 ... Fiber 22 ... Thermoplastic resin R1 ... Resin impregnated part R2 ... Not impregnated with resin part

Claims (22)

The first layer, which is the resin partially impregnated fiber portion partially impregnated with the resin,
It has a second layer containing fibers and a thermoplastic resin and has
The first layer is arranged on the surface of the second layer .
The first layer has a portion impregnated with resin and a portion not impregnated with resin in the thickness direction of the first layer.
A fiber-reinforced member in which a portion of the first layer impregnated with the resin is arranged on the surface of the second layer. The first layer, which is the resin partially impregnated fiber portion partially impregnated with the resin,
It has a second layer containing fibers and a thermoplastic resin and has
The first layer is arranged on the surface of the second layer.
The fibers included in the second layer is a continuous fiber, fiber-reinforced member. With the base material
A fiber-free resin portion arranged on the surface of the base material portion and a resin portion
The second layer arranged on the side of the resin portion opposite to the base material portion side,
The fiber-reinforced member according to claim 1 or 2, which has the first layer arranged on the side opposite to the resin portion side of the second layer. A base material portion and a rib portion protruding from the first surface of the base material portion are provided.
A claim that the rib portion has a resin portion containing no fiber, the second layer arranged outside the resin portion, and the first layer arranged outside the second layer. Item 2. The fiber reinforced member according to Item 1 or 2. The maximum width of the rib portion is 0.3 cm or more and 5 cm or less.
The height of the rib portion is 0.3 cm or more and 10 cm or less.
The fiber-reinforced member according to claim 4, wherein the rib portion has a length of 10 cm or more. The fiber-reinforced member according to any one of claims 3 to 5, wherein the resin portion contains acrylic particles having a hollow structure. The fiber-reinforced member according to any one of claims 3 to 6, wherein the base material contains fibers. The fiber-reinforced member according to any one of claims 3 to 7 , wherein the base material portion contains a resin and a fiber. Any one of claims 3 to 8 , wherein the base material portion has a resin-unimpregnated fiber portion that is not impregnated with resin, or has a resin partially impregnated fiber portion that is partially impregnated with resin. The fiber reinforcing member described in. The base unit comprises a carbon fiber cloth, carbon fiber felt mat, carbon fiber paper, carbon fiber chopped yarn, glass roving cloth, glass fiber paper, glass chopped strand mat, or glass roving mat claim 3-9 The fiber reinforcing member according to any one of the above items. The base material contains a resin and
The resin contained in the base material is a cured product of a thermosetting resin.
The fiber-reinforced member according to any one of claims 3 to 10 , wherein the thermosetting resin is an unsaturated polyester resin, a vinyl ester resin, an epoxy resin, or a phenolic resin. The fiber-reinforced member according to any one of claims 1 to 11 , wherein the first layer is the outermost layer. The fiber-reinforced member according to any one of claims 1 to 12 , wherein the form of the fiber contained in the first layer is a non-woven fabric. The fiber-reinforced member according to claim 13 , wherein the non-woven fabric is made of glass fiber. The fiber-reinforced member according to any one of claims 1 to 14 , wherein the average thickness of the first layer is 0.1 mm or more and 1.0 mm or less. The first fiber reinforced member and
With the second fiber reinforced member,
Equipped with a joining member
The first fiber reinforcing member and the second fiber reinforcing member are joined by the joining member.
A bonded structure in which the first fiber reinforcing member and the second fiber reinforcing member are each formed of the fiber reinforcing member according to any one of claims 1 to 15. The joining member is arranged so as to reach both the surfaces of the first layer of the first fiber reinforcing member and the surface of the first layer of the second fiber reinforcing member. The joined structure according to claim 16. The joining according to claim 16 or 17 , wherein the joining member is a fiber-reinforced sheet which is a resin partially impregnated fiber portion partially impregnated with a resin or a whole resin impregnated fiber portion impregnated with a resin as a whole. Structure. The bonded structure according to claim 18 , wherein the form of the fiber contained in the fiber reinforced sheet is UD, a woven fabric, or a non-woven fabric. The bonded structure according to claim 18 or 19 , wherein the fibers contained in the fiber-reinforced sheet are glass fibers or carbon fibers. Equipped with fixing members
The joining structure according to any one of claims 16 to 20 , wherein the fixing member is arranged outside the joining member. The joint structure according to claim 21 , wherein the fixing member is a resin member, a metal member, or a wood member.

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