JP5972854B2 - Joining method and joined body of fiber reinforced composite member, and manufacturing method of wind turbine blade - Google Patents

Joining method and joined body of fiber reinforced composite member, and manufacturing method of wind turbine blade Download PDF

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JP5972854B2
JP5972854B2 JP2013259741A JP2013259741A JP5972854B2 JP 5972854 B2 JP5972854 B2 JP 5972854B2 JP 2013259741 A JP2013259741 A JP 2013259741A JP 2013259741 A JP2013259741 A JP 2013259741A JP 5972854 B2 JP5972854 B2 JP 5972854B2
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fiber reinforced
reinforced composite
composite member
fiber
member
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JP2015116672A (en
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新藤 健太郎
健太郎 新藤
利和 重冨
利和 重冨
藤田 健
健 藤田
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三菱重工業株式会社
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  The present disclosure relates to a joining method and joined body of fiber-reinforced composite members including reinforcing fibers, and a method for manufacturing a wind turbine blade.

  2. Description of the Related Art Conventionally, fiber reinforced composite members including resin and reinforcing fibers are widely used as members for wind turbine blades, aircraft main wings, automobiles, ships, railway vehicles, and the like because of their high strength and light weight. In general, a fiber-reinforced composite member often has a configuration in which a plurality of laminated sheets including reinforcing fibers are stacked so as to have a laminated structure having the strength and rigidity required for the member. The laminated sheet constituting the fiber-reinforced composite member usually has a configuration in which a plurality of thin sheet-like members made of fibers aligned in one direction or woven fibers are laminated and integrated. For example, as a method for manufacturing a fiber reinforced composite member, there are known a method in which a dry cloth is impregnated with a resin to cure the resin, and a method in which a semi-cured prepreg material in which a reinforcing fiber base material is impregnated with a resin is cured. It has been.

  In such a fiber reinforced composite member, although strength is ensured for a member that does not have a joined portion, when the fiber reinforced composite members are joined together, a decrease in strength at the joined portion becomes a problem. Therefore, a technique capable of joining fiber reinforced composite members while maintaining sufficient strength is required.

  Therefore, as a method of joining fiber reinforced composite members with improved joint strength, lap joining where the ends of fiber reinforced composite members are overlapped and joining where the ends of fiber reinforced composite members are tapered are known. It has been. Further, for example, in Patent Document 1, a joint between fiber reinforced composite members is reinforced with a reinforcing fiber cloth and a curable resin, and a plate spanned between ends of the fiber reinforced composite member is bonded to the fiber reinforced composite member. The configuration is disclosed. Further, Patent Documents 2 and 3 similarly describe a method of joining fiber reinforced composite members with a reinforcing material spanned between ends of fiber reinforced composite members.

Japanese Patent Publication No. 4-58782 Japanese Patent No. 2582259 Japanese Patent No. 3825346

By the way, when bonding fiber-reinforced composite members, compressive strength is more important than tensile strength for primary structural members. Usually, the compressive strength of the fiber reinforced composite member is lower than its tensile strength, and when designing various structures, the compressive strength is often designed based on this compressive strength. However, when a fiber reinforced composite member is used as the strength member, there may be a problem in strength reliability due to insufficient compressive strength at the joint.
Among conventional bonding methods, lap bonding improves bonding strength compared to simply joining fiber reinforced composite members together, but it is still difficult to obtain sufficient bonding strength, especially as a structure or its strength member When used, the strength may be insufficient. Moreover, the joining which forms the butt | matching area | region of a fiber reinforced composite member in a taper shape has the problem that processing of a butt | matching area | region takes time. Furthermore, in the joining methods described in Patent Documents 1 to 3, since the reinforcing material is disposed so as to sandwich the joined portion where the fiber-reinforced composite members are abutted with each other, the out-of-plane deformation that occurs when compressive stress is applied. However, in order to obtain the required compressive strength, a reinforcing material having a sufficient thickness and area must be provided at the joint between the fiber reinforced composite members. Therefore, depending on the use of the fiber-reinforced composite member, the weight and size of the reinforcing material may be a problem, and it may be difficult to adopt.

  In view of the above circumstances, at least one embodiment of the present invention is a fiber-reinforced composite member joining method and joined body, and a wind turbine blade manufacturing method capable of realizing a joining structure that contributes to an improvement in compressive strength at the joint. The purpose is to provide.

A method for joining fiber-reinforced composite members according to at least one embodiment of the present invention is as follows.
An end portion of a first fiber reinforced composite member that is a set of first fiber reinforced rod members including a resin and a fiber bundle, and a second fiber reinforced composite member that is a set of second fiber reinforced rod members including a resin and a fiber bundle. A butting step of matching the end,
Joining the end of the first fiber reinforced composite member and the end of the second fiber reinforced composite member; and
The end surface of at least one first fiber reinforced rod member is recessed with respect to the end surface of the surrounding first fiber reinforced rod member, and the end portion of the first fiber reinforced composite member has the at least one first fiber reinforced rod member. 1st recessed part is formed of 1 fiber reinforced rod member,
At least one end face of the second fiber reinforced rod member protrudes from an end face of the surrounding second fiber reinforced rod member, and the end portion of the second fiber reinforced composite member has the at least one second end. The 2nd convex part is formed with 2 fiber reinforced rod members,
In the butting step, the second convex portion of the second fiber-reinforced composite member is fitted into the first concave portion of the first fiber-reinforced composite member,
In the joining step, the end portion of the first fiber reinforced composite member and the second fiber reinforced composite member in a state where the end portions of the first fiber reinforced composite member and the second fiber reinforced composite member are abutted with each other. A resin is injected into a gap between the end portions of the resin and the resin is cured.

  According to the above-mentioned fiber reinforced composite member joining method, after the second convex portion of the second fiber reinforced composite member is fitted into the first concave portion of the first fiber reinforced composite member, the resin injected into these gaps is cured. The first fiber reinforced composite member and the second fiber reinforced composite member are joined together. The joined body joined in this manner has upper and lower surfaces of the second convex portion (both end surfaces of the second convex portion in the thickness direction of the fiber-reinforced composite member. That is, in-plane direction of the fiber-reinforced composite member) The outer surface of the second convex portion along the surface of the second convex portion is suppressed, so that even when compressive stress is applied, it is possible to make the structure difficult to buckle in the out-of-plane direction, and the compressive strength at the joint portion can be maintained high. Therefore, regardless of the presence or absence of the reinforcing material, the joint structure itself of the fiber reinforced composite member contributes to the realization of a high compressive strength, and as a result, a decrease in strength reliability due to the joining of the fiber reinforced composite member can be suppressed. Further, since the first fiber reinforced composite member or the second fiber reinforced composite member is constituted by a set of the first fiber reinforced rod member or the second fiber reinforced rod member including the resin and the fiber bundle, respectively, A 2nd convex part can be formed easily. Furthermore, the 1st recessed part or 2nd convex part of a desired shape and size can be obtained in a desired position by adjusting the edge part length of a 1st fiber reinforced rod member or a 2nd fiber reinforced rod member, respectively.

In one embodiment, the end portion of the first fiber reinforced member includes a plurality of the first fiber reinforced rod members recessed with respect to an end surface of the surrounding first fiber reinforced rod member. A first recess is formed, and a plurality of the second fiber reinforced members are formed at the end portion of the second fiber reinforced member by the at least one second fiber reinforced rod member protruding relative to an end surface of the surrounding second fiber reinforced rod member. The second convex portion is formed, and in the butting step, the second convex portion is fitted into the plurality of first concave portions, respectively.
Thus, by providing a plurality of first recesses in the first fiber reinforced composite member, the number of places where the first fiber reinforced composite member and the second fiber reinforced composite member are fitted increases, and the compressive strength can be further increased. . That is, the contact part of the wall surface of a 1st recessed part and the upper and lower surfaces of a 2nd convex part with the increase in the fitting location of the 1st recessed part of a 1st fiber reinforced member, and the 2nd convex part of a 2nd fiber reinforced member. Since the area of the contact portion (including the contact portion through the resin) is increased, the deformation of the joined body in the out-of-plane direction is further suppressed.

In one embodiment, at least one first convex portion is formed by the surrounding first fiber reinforced rod member, and at least one second concave portion is formed by the surrounding second fiber reinforced rod member. In the butting step, the first convex portion of the first fiber reinforced composite member is fitted to the second concave portion of the second fiber reinforced composite member.
Thus, the 1st fiber reinforced rod member is also provided with the 1st convex part which projected to the 2nd fiber reinforced composite member side, and the 2nd crevice is provided in the 2nd fiber reinforced composite member corresponding to this. Thereby, the location where the 1st fiber reinforced composite member and the 2nd fiber reinforced composite member fit further increases, and the further improvement in compressive strength can be aimed at. That is, the contact portion between the wall surface of the first concave portion and the upper and lower surfaces of the second convex portion by additionally fitting the first convex portion of the first fiber reinforced member and the second concave portion of the second fiber reinforced member. In addition, the contact portion between the wall surface of the second concave portion and the upper and lower surfaces of the first convex portion contributes to suppression of deformation in the out-of-plane direction of the joined body.

In one embodiment, an end portion of the first fiber reinforced member is provided with the first concave portion and the first convex portion alternately in the thickness direction of the first fiber reinforced member, and the second fiber reinforced member is provided. The second concave portion and the second convex portion are alternately provided in the end portion of the member in the thickness direction of the second fiber reinforced member.
Thereby, in the thickness direction of the joined body, the contact portion between the wall surface of the first concave portion and the upper and lower surfaces of the second convex portion, and the contact portion between the wall surface of the second concave portion and the upper and lower surfaces of the first convex portion are multilayered. Can be formed. Therefore, by increasing the number of each contact portion in the thickness direction of the joined body, regardless of the size in the width direction of the joined portion of the first fiber reinforced composite member and the second fiber reinforced composite member, in the out-of-plane direction of the joined body. The area of the contact portion that can contribute to the suppression of deformation can be arbitrarily increased.

In some embodiments, the plurality of first fiber reinforced rod members forming the first fiber reinforced member are coupled to each other on the base side of the first fiber reinforced composite member, and the first fiber reinforced composite The plurality of second fiber reinforced rod members that are not constrained to each other on the end side of the member and form the second fiber reinforced member are coupled to each other on the base side of the second fiber reinforced composite member. The second fiber reinforced composite member is not constrained to each other on the end side.
Thereby, since the end part of the 1st fiber reinforced composite member and the 2nd fiber reinforced composite member which fit mutually can be given flexibility, the position of each convex part and the concave part corresponding to this is somewhat. Even if they are misaligned, the ends can be easily fitted together.

The joined body of the fiber-reinforced composite member according to at least one embodiment of the present invention,
A first fiber-reinforced composite member that is a set of first fiber-reinforced rod members including a resin and a fiber bundle;
A second fiber reinforced composite member that is a set of second fiber reinforced rod members including a resin and a fiber bundle, and is joined to the first fiber reinforced composite member,
The end surface of at least one first fiber reinforced rod member is recessed with respect to the end surface of the surrounding first fiber reinforced rod member, and the end portion of the first fiber reinforced composite member has the at least one first fiber reinforced rod member. 1st recessed part is formed of 1 fiber reinforced rod member,
At least one end face of the second fiber reinforced rod member protrudes from an end face of the surrounding second fiber reinforced rod member, and the end portion of the second fiber reinforced composite member has the at least one second end. The 2nd convex part is formed with 2 fiber reinforced rod members,
The ends of the first fiber reinforced composite member and the second fiber reinforced composite member so that the second convex portion of the second fiber reinforced composite member is fitted in the first concave portion of the first fiber reinforced composite member. The parts are butted together and joined.

  The joined body of the fiber reinforced composite member has the first fiber reinforced composite member and the second fiber reinforced so that the second convex portion of the second fiber reinforced composite member is fitted into the first concave portion of the first fiber reinforced composite member. Since the end portions of the composite member are abutted and joined to each other, it is possible to make the structure difficult to buckle in the out-of-plane direction even when compressive stress is applied, and the compressive strength at the joined portion can be maintained high. Therefore, regardless of the presence or absence of the reinforcing material, the joint structure itself of the fiber reinforced composite member contributes to the realization of a high compressive strength, and as a result, a decrease in strength reliability due to the joining of the fiber reinforced composite member can be suppressed. Further, since the first fiber reinforced composite member or the second fiber reinforced composite member is constituted by a set of the first fiber reinforced rod member or the second fiber reinforced rod member including the resin and the fiber bundle, respectively, A 2nd convex part can be formed easily. Furthermore, the 1st recessed part or 2nd convex part of a desired shape and size can be obtained in a desired position by adjusting the edge part length of a 1st fiber reinforced rod member or a 2nd fiber reinforced rod member, respectively.

A method for manufacturing a wind turbine blade according to at least one embodiment of the present invention includes:
A method of manufacturing a wind turbine blade including an outer skin material and a spar cap provided to extend in the blade length direction,
The spar cap is a first fiber reinforced composite member that is a set of first fiber reinforced rod members that include a resin and a fiber bundle, and a second fiber reinforced composite that is a set of second fiber reinforced rod members that include a resin and a fiber bundle. Including parts,
A butting step of abutting the end of the first fiber reinforced composite member and the end of the second fiber reinforced composite member;
Joining the end of the first fiber reinforced composite member and the end of the second fiber reinforced composite member; and
The end surface of at least one first fiber reinforced rod member is recessed with respect to the end surface of the surrounding first fiber reinforced rod member, and the end portion of the first fiber reinforced composite member has the at least one first fiber reinforced rod member. 1st recessed part is formed of 1 fiber reinforced rod member,
At least one end face of the second fiber reinforced rod member protrudes from an end face of the surrounding second fiber reinforced rod member, and the end portion of the second fiber reinforced composite member has the at least one second end. The 2nd convex part is formed with 2 fiber reinforced rod members,
In the butting step, the second convex portion of the second fiber-reinforced composite member is fitted into the first concave portion of the first fiber-reinforced composite member,
In the joining step, the end portion of the first fiber reinforced composite member and the second fiber reinforced composite member in a state where the end portions of the first fiber reinforced composite member and the second fiber reinforced composite member are abutted with each other. A resin is injected into a gap between the end portions of the resin and the resin is cured.

Some typical wind turbine blades include a spar cap formed of a fiber-reinforced composite member. Since this spar cap is long in the blade length direction, it is required to adopt a split structure from the viewpoint of transportation and production yield improvement. However, since the spar cap functions as a strength member of the wind turbine blade, it is necessary to join the divided members while maintaining high strength reliability.
The wind turbine blade manufacturing method includes a butting step of butting the ends of the first fiber reinforced composite member and the second fiber reinforced composite member, which are constituent members of the spar cap, and a joining step of joining the butted ends. Including. In the butt step, the second convex portion of the second fiber reinforced composite member is fitted into the first concave portion of the first fiber reinforced composite member, and in the joining step, the end portion of the first fiber reinforced composite member and the second fiber The first fiber reinforced composite member and the second fiber reinforced composite member are joined by injecting resin into the gap between the ends of the reinforced composite member and curing the resin. Thereby, it can be set as the structure which is hard to buckle to an out-of-plane direction even if compressive stress is added, and the compressive strength in a junction part can be maintained high. Therefore, regardless of the presence or absence of the reinforcing material, the joint structure itself of the fiber reinforced composite member contributes to the realization of a high compressive strength, and as a result, a decrease in strength reliability due to the joining of the fiber reinforced composite member can be suppressed. Further, since the first fiber reinforced composite member or the second fiber reinforced composite member is constituted by a set of the first fiber reinforced rod member or the second fiber reinforced rod member including the resin and the fiber bundle, respectively, A 2nd convex part can be formed easily. Furthermore, the 1st recessed part or 2nd convex part of a desired shape and size can be obtained in a desired position by adjusting the edge part length of a 1st fiber reinforced rod member or a 2nd fiber reinforced rod member, respectively.

  According to at least one embodiment of the present invention, regardless of the presence or absence of a reinforcing material, the bonding structure itself of the fiber reinforced composite member contributes to the realization of high compressive strength, and as a result, the strength reliability due to the bonding of the fiber reinforced composite member Can be suppressed.

It is a perspective view which shows the conjugate | zygote of the fiber reinforced composite member which concerns on one Embodiment. It is a figure which shows the procedure in the joining method of the fiber reinforced composite member which concerns on one Embodiment. It is a perspective view which shows the structural example of the fiber reinforced composite member which concerns on one Embodiment. It is a figure for demonstrating the conjugate | zygote of the fiber reinforced composite member which concerns on a 1st modification. It is a figure for demonstrating the conjugate | zygote of the fiber reinforced composite member which concerns on a 2nd modification. It is a figure for demonstrating the conjugate | zygote of the fiber reinforced composite member which concerns on a 3rd modification. It is the schematic which shows the whole structure of the windmill concerning one Embodiment. It is sectional drawing which shows the windmill blade which concerns on one Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described below as the embodiments or shown in the drawings as the embodiments are not intended to limit the scope of the present invention. It is just an example.

FIG. 1 is a perspective view showing a joined body of fiber-reinforced composite members according to an embodiment. FIG. 2 is a diagram illustrating a procedure in a method for joining fiber-reinforced composite members according to an embodiment.
As shown in FIGS. 1 and 2, a bonded body 1 of fiber reinforced composite members in some embodiments includes a first fiber reinforced composite member 10 and a second fiber reinforced composite member 20, and these fiber reinforced composites. The end faces of the composite members 10 and 20 are joined together.

  The first fiber reinforced composite member 10 is a set of first fiber reinforced rod members 11 including a resin and a fiber bundle. Specifically, the first fiber reinforced composite member 10 has a configuration in which a plurality of first fiber reinforced rod members 11 are arranged in one direction, and at least two or more first fiber reinforced rod members 11 have a width. You may arrange in a direction and thickness direction, respectively. The first fiber reinforced rod member 11 may extend in the fiber direction of the first fiber reinforced composite member 10. In addition, the plurality of first fiber reinforced rod members 11 have an integrated configuration in which at least a part thereof is coupled to each other by a resin. The first fiber reinforced composite member 10 may be a prepreg material in which the resin is semi-cured, or may be a fiber reinforced composite member in which the resin is completely cured.

  The second fiber reinforced composite member 20 is a set of second fiber reinforced rod members 21 including a resin and a fiber bundle, and is joined to the first fiber reinforced composite member 10. Specifically, the second fiber reinforced composite member 20 has a configuration in which a plurality of second fiber reinforced rod members 21 are arranged in one direction, and at least two or more second fiber reinforced rod members 21 have a width. You may arrange in a direction and thickness direction, respectively. The second fiber reinforced rod member 21 may extend in the fiber direction of the second fiber reinforced composite member 20. In addition, the plurality of second fiber reinforced rod members 21 have an integrated configuration in which at least a part is coupled to each other with resin. The second fiber reinforced composite member 20 may be a prepreg material in which the resin is in a semi-cured state, or may be a fiber reinforced composite member in which the resin is completely cured.

As the reinforcing fiber in the first fiber reinforced composite member 10 or the second fiber reinforced composite member 20, for example, carbon fiber or glass fiber is used.
The first fiber reinforced rod member 11 or the second fiber reinforced rod member 21 includes a fiber bundle in which a plurality of reinforcing fibers aligned in one direction are integrated with a resin. In addition, the cross section of the first fiber reinforced rod member 11 or the second fiber reinforced rod member 21 may be circular or elliptical, or square (a square cut out so that the corners are linear or have a curvature). May be included).

Each fiber reinforced composite member 10, 20 in one embodiment further has the following configuration.
In the first fiber reinforced composite member 10, the end surface 16 a of at least one first fiber reinforced rod member 11 is recessed with respect to the end surface 15 a of the surrounding first fiber reinforced rod member 11. Thereby, the 1st recessed part 16 which has the end surface 16a is formed in the edge part of the 1st fiber reinforced composite member 10 by the at least 1 1st fiber reinforced rod member 11. FIG.
Similarly, in the second fiber reinforced composite member 20, at least one end face 25 a of the second fiber reinforced rod member 21 protrudes from the end face 26 a of the surrounding second fiber reinforced rod member 21. As a result, at the end of the second fiber reinforced composite member 20, the second convex portion 25 having the end face 25a is formed by at least one second fiber reinforced rod member 21.
And the joined body 1 of the fiber reinforced composite member includes the first fiber reinforced composite so that the second convex portion 25 of the second fiber reinforced composite member 21 is fitted into the first concave portion 16 of the first fiber reinforced composite member 11. The ends of the member 10 and the second fiber reinforced composite member 20 are abutted and joined. In this joined body 1, the end surface 16 a of the first concave portion 16 and the end surface 25 a of the second convex portion 25 are located facing each other. The end surface 16a and the end surface 25a may be positioned so as to contact each other, or may be positioned such that there is a gap between the end surface 16a and the end surface 25a. In the latter case, the gap is filled with resin between the end surface 16a and the end surface 25a. In addition, the 1st recessed part 16 or the 2nd convex part 25 may have the diameter more than the one of the 1st fiber reinforced rod member 11 or the 2nd fiber reinforced rod member 21. FIG.

In one embodiment, a plurality of first recesses 16 are formed at the end of the first fiber reinforced composite member 10, and a plurality of second protrusions 25 are formed at the end of the second fiber reinforced composite member 20. Yes. The joined body 1 has a configuration in which a plurality of first concave portions 16 and a plurality of second convex portions 25 are fitted and joined.
Thus, by providing the 1st fiber reinforced composite member 10 with the several 1st recessed part 16, the location where the 1st fiber reinforced composite member 10 and the 2nd fiber reinforced composite member 20 fit increases, and it compresses further. Strength can be increased. That is, with the increase of the fitting location of the 1st recessed part 16 of the 1st fiber reinforced member 10, and the 2nd convex part 25 of the 2nd fiber reinforced member 20, the wall surface of the 1st recessed part 16 and the 2nd convex part 25 are increased. Since the area of the contact portion (including the contact portion through the resin) with the upper and lower surfaces is increased, the deformation of the joined body 1 in the out-of-plane direction is further suppressed.

In one embodiment, the joined body 1 has a configuration in which the first convex portion 15 of the first fiber-reinforced composite member 10 and the second concave portion 26 of the second fiber-reinforced composite member 20 are fitted and joined. .
That is, at least one first convex portion 15 is formed at the end portion of the first fiber reinforced composite member 10 by at least one first fiber reinforced rod member 11 around the first concave portion 16.
Similarly, at least one second concave portion 26 is formed at the end of the second fiber reinforced composite member 20 by at least one second fiber reinforced rod member 21 around the second convex portion 25.
And the joined body 1 of a fiber reinforced composite member is fitted with the second convex part 25 of the second fiber reinforced composite member 21 in the first concave part 16 of the first fiber reinforced composite member 11, and the first fiber reinforced composite member. In this state, the second concave portion 26 of the second fiber-reinforced composite member 21 is fitted to the first convex portion 15 of the eleventh, and is joined by resin. In this joined body 1, the end surface 16a of the first concave portion 16 and the end surface 25a of the second convex portion 25, and the end surface 15a of the first convex portion 15 and the end surface 26a of the second concave portion 26 are positioned to face each other. Yes. The end surface 16a and the end surface 25a or the end surface 15a and the end surface 26a may be positioned so as to contact each other, or are positioned so that there is a gap between the end surface 16a and the end surface 25a or between the end surface 15a and the end surface 26a. May be. In the latter case, the gap is filled between the end face 16a and the end face 25a or between the end face 15a and the end face 26a.

  Thus, the 1st fiber reinforced rod member 11 is also provided with the 1st convex part 15 projected to the 2nd fiber reinforced composite member 20 side, and the 2nd crevice 26 is provided in the 2nd fiber reinforced composite member 20 corresponding to this. Is provided, the number of places where the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 are fitted further increases, and the compressive strength can be further improved. That is, by additionally fitting the first convex portion 15 of the first fiber reinforced member 10 and the second concave portion 26 of the second fiber reinforced member 20, the wall surface of the first concave portion 16 and the second convex portion 25. Not only the contact portion with the upper and lower surfaces but also the contact portion between the wall surface of the second concave portion 26 and the upper and lower surfaces of the first convex portion 15 contributes to suppression of deformation in the out-of-plane direction of the joined body.

  In one embodiment, the first fiber reinforced member 10 is alternately provided with first concave portions 16 and first convex portions 15 in the thickness direction of the first fiber reinforced member 10 at the end portion of the first fiber reinforced member 10. The second concave portions 26 and the second convex portions 25 are alternately provided at the end portion 20 in the thickness direction of the second fiber reinforced member 20. In the example shown in FIG.1 and FIG.2, the 1st recessed part 16 and the 1st convex corresponding to the 1st fiber reinforced rod member 11 for one each in the width direction and thickness direction of the 1st fiber reinforced composite member 10, respectively. The parts 15 are arranged alternately. Similarly, the 2nd convex part 25 and the 1st recessed part 16 corresponding to the 2nd fiber reinforced rod member 21 for one each are alternately arrange | positioned in the width direction and thickness direction of the 2nd fiber reinforced composite member 20, respectively. It has been configured.

  With the above configuration, with respect to the thickness direction of the joined body 1, the contact portion between the wall surface of the first concave portion 16 and the upper and lower surfaces of the second convex portion 25, the wall surface of the second concave portion 26, and the upper and lower surfaces of the first convex portion 15 The contact portion can be formed in multiple layers. Therefore, by increasing the number of each contact part in the thickness direction of the joined body 1, regardless of the width direction size of the joined part of the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20, The area of the contact portion that can contribute to the suppression of deformation in the out-of-plane direction can be arbitrarily increased.

FIG. 3 is a perspective view illustrating a configuration example of a fiber-reinforced composite member according to an embodiment.
As shown in FIG. 3, in one embodiment, the plurality of first fiber reinforced rod members 11 forming the first fiber reinforced member 10 are coupled to each other on the base 10 b side of the first fiber reinforced composite member 10. The first fiber reinforced composite member 10 is not restrained on the end 10a side. Specifically, a boundary 17 between a portion constrained to each other and a portion not constrained to each other may be provided at a position separated from the end surface 16a of the first recess 16 by the distance d toward the base portion 10b. This distance d includes 0 (that is, the boundary 17 coincides with the end face 16a). For example, at the time of manufacturing the first fiber reinforced composite member 10, after arranging the plurality of first fiber reinforced rod members 11 side by side, the base 10 b is prevented from entering the end 10 a side of the first fiber reinforced composite member 10. Resin is injected only on the side and cured or semi-cured. Thereby, the edge part 10a of the 1st fiber reinforced composite member 10 will be in the state which the 1st fiber reinforced rod member 11 exposed, and the flexibility of the edge part 10a is maintained.

  Similarly, although not shown in FIG. 3, the plurality of second fiber reinforced rod members 21 forming the second fiber reinforced member 20 are coupled to each other on the base side of the second fiber reinforced composite member 20. The second fiber reinforced composite member 20 is not restrained on the end side. Note that the second fiber reinforced composite member 20 can employ the same configuration as that of the first fiber reinforced composite member 10 described above.

  By adopting such a configuration, the end portions of the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 that are fitted to each other can be made flexible. Even if the positions of the corresponding concave portions 26 and 16 are slightly deviated from each other, the end portions can be easily fitted to each other.

  According to the above embodiment, the first fiber reinforced composite member 10 and the second fiber reinforced composite member 10 and the second fiber reinforced composite member 10 are fitted in the first concave portion 16 of the first fiber reinforced composite member 10 so that the second convex portion 25 of the second fiber reinforced composite member 20 is fitted. Since the ends of the fiber reinforced composite member 20 are abutted and joined to each other, even if a compressive stress is applied, it is possible to make the structure difficult to buckle in the out-of-plane direction, and the compressive strength at the joint can be maintained high. Therefore, regardless of the presence or absence of a reinforcing material, the joint structure itself of the fiber reinforced composite members 10 and 20 contributes to the realization of a high compressive strength, resulting in a decrease in strength reliability due to the joining of the fiber reinforced composite members 10 and 20. Can be suppressed. In addition, since the first fiber reinforced composite member 10 or the second fiber reinforced composite member 20 is configured by a set of the first fiber reinforced rod member 11 or the second fiber reinforced rod member 21 including a resin and a fiber bundle, respectively. The 1st recessed part 16 or the 2nd convex part 25 can be formed easily. Further, by adjusting the end lengths of the first fiber reinforced rod member 11 or the second fiber reinforced rod member 21, the first concave portion 16 or the second convex portion 25 having a desired shape and size is obtained at a desired position. be able to.

Here, a modified example of the above-described embodiment will be described.
4A to 4C are views for explaining a joined body of fiber-reinforced composite members according to first to third modifications.
In the joined body 1A of the fiber-reinforced composite member shown in FIG. 4A, the first concave portions 16 and the first convex portions 15 of the first fiber-reinforced composite member 10 are alternately positioned with respect to the thickness direction. The second convex portion 25 and the second concave portion 26 of the fiber reinforced composite member 20 are alternately arranged in the thickness direction. In this configuration, there is no unevenness in the width direction. And in the state which the 1st recessed part 16 and the 2nd convex part 25, and the 1st convex part 15 and the 2nd recessed part 26 each fitted, of the 1st fiber reinforced composite member 10 and the 2nd fiber reinforced composite member 20 The ends are abutted and joined. Thereby, since the contact surface in the width direction of the 1st fiber reinforced composite member 10 and the 2nd fiber reinforced composite member 20 does not exist, the width direction of the 1st fiber reinforced composite member 10 and the 2nd fiber reinforced composite member 20 is joined at the time of joining. Position adjustment can be performed easily.

  4B has the 1st recessed part 16 of the 1st fiber reinforced composite member 10 regarding thickness direction, and the unevenness | corrugation does not exist in the width direction. Specifically, the first recess 16 in the thickness direction is formed in a stepped shape by the plurality of first fiber reinforced rod members 11. Similarly, the 2nd convex part 25 of the 2nd fiber reinforced composite member 20 is provided regarding the thickness direction, and an unevenness | corrugation does not exist in the width direction. Specifically, the 2nd convex part 25 regarding the thickness direction is formed in the level | step difference by the some 2nd fiber reinforced rod member 21. As shown in FIG. According to such a structure, since the unevenness | corrugation is formed in the step shape in each fiber reinforced composite member 10 and 20, the operation | work which fits fiber reinforced composite member 10 and 20 can be performed smoothly.

  In the fiber-reinforced composite member joined body 1C shown in FIG. 4C, the first concave portions 16 or the first convex portions 15 are formed by the plurality of first fiber-reinforced composite members 10, and the plurality of second fiber-reinforced composite members 20 are similarly formed. The second convex portion 25 or the second concave portion 26 is formed. In FIG. 4C, the first concave portion 16 or the first convex portion 15 is formed by the two first fiber reinforced composite members 10 in the thickness direction and the width direction, respectively, and the two second fiber reinforced composite members. The case where the 2nd convex part 25 or the 2nd recessed part 26 is formed by 20 is illustrated. Thereby, manufacture of each fiber reinforced composite member 10 and 20 can be facilitated.

Next, with reference to FIG. 2, the joining method of the fiber reinforced composite member which concerns on one Embodiment is demonstrated.
The fiber-reinforced composite member joining method according to the embodiment includes a butting step of abutting the end portion of the first fiber-reinforced composite member 10 and the end portion of the second fiber-reinforced composite member 20, and the first fiber-reinforced composite member 10. A joining step for joining the end of the second fiber-reinforced composite member 20 and the end of the second fiber-reinforced composite member 20. In addition, about the structure of each fiber reinforced composite member 10 and 20, since it is the same as that of the conjugate | zygote 1 mentioned above, the detailed description is abbreviate | omitted.

In the butting step, as shown in FIGS. 2A and 2B, the second convex portion 25 of the second fiber-reinforced composite member 20 is fitted into the first concave portion 16 of the first fiber-reinforced composite member 10. At this time, when there are a plurality of first concave portions 16 and a plurality of second convex portions 25, the second convex portions 25 are fitted into the plurality of first concave portions 16, respectively. Further, when the first fiber reinforced composite member 10 has the first concave portion 16 and the second convex portion 25 and the second fiber reinforced composite member 20 has the second convex portion 25 and the second concave portion 26, the first The second convex portion 25 is fitted into the concave portion 16 and the first convex portion 15 is fitted into the second concave portion 26.
In the joining step, as shown in FIG. 2 (c), the end portions of the first fiber reinforced composite member 10 and the end portions of the first fiber reinforced composite member 10 are brought into contact with each other with the end portions of the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 in contact Resin is injected into the gap between the end portions of the second fiber-reinforced composite member 20, and the resin is cured. As a specific joining method in the joining step, for example, VaRTM (reduced pressure injection method) can be used. That is, the joint portion where the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 are abutted is covered with a vacuum bag film, and after the internal space of the film is reduced in pressure, a low-viscosity thermosetting resin (for example, Unsaturated polyester resin, epoxy resin, etc.) are injected and cured. In addition, about resin which needs heat hardening, it may heat with a warm air machine or a silicon rubber heater, and may harden resin. As another method, the resin or adhesive is applied in advance to at least one of the end portions of the first fiber reinforced composite member 10 or the second fiber reinforced composite member 20, and the first fiber reinforced composite member 10 and the first fiber reinforced composite member 10 The resin or adhesive may be cured after the ends of the two-fiber reinforced composite member 20 are inserted into each other.

  According to the above-mentioned embodiment, after fitting the 2nd convex part 25 of the 2nd fiber reinforced composite member 20 in the 1st recessed part 16 of the 1st fiber reinforced composite member 10, the resin inject | poured into these clearance gaps is hardened. Thus, the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 are joined. Since the joined body 1 joined by this is pressed on the upper and lower surfaces of the second convex portion 25 by the wall surface of the first concave portion 16, it can be structured to hardly buckle out of the plane even when compressive stress is applied, High compressive strength at the joint can be maintained. Therefore, regardless of the presence or absence of a reinforcing material, the joint structure itself of the fiber reinforced composite members 10 and 20 contributes to the realization of a high compressive strength, resulting in a decrease in strength reliability due to the joining of the fiber reinforced composite members 10 and 20. Can be suppressed. In addition, since the first fiber reinforced composite member 10 or the second fiber reinforced composite member 20 is configured by a set of the first fiber reinforced rod member 11 or the second fiber reinforced rod member 21 including a resin and a fiber bundle, respectively. The 1st recessed part 16 or the 2nd convex part 25 can be formed easily. Furthermore, by adjusting the end lengths of the first fiber reinforced rod member 11 or the second fiber reinforced rod member 21, the first concave portion 16 or the second convex portion 26 having a desired shape and size is obtained at a desired position. be able to.

Here, the example which applied the above-mentioned embodiment to a windmill blade is demonstrated below.
FIG. 5 is a schematic diagram showing an overall configuration of a wind turbine according to an embodiment. FIG. 6 is a cross-sectional view showing a wind turbine blade according to an embodiment.
As shown in FIG. 5, the windmill 30 includes a rotor 33 including at least one windmill blade 31 and a hub 32, a nacelle 34 that rotatably supports the rotor 33, and a nacelle that is erected on the ground or water. And a tower 35 to which 34 is attached. When the windmill 30 is a wind power generator, the rotation of the rotor 33 is input to a generator (not shown) to generate power.

  As shown in FIGS. 5 and 6, the wind turbine blade 31 includes an outer skin material 41 and a spar cap 42 that extends in the blade length direction. The blade length direction is a direction from the blade root 31a of the wind turbine blade 31 toward the tip 31b, and is substantially parallel to the blade axis.

  The outer skin material 41 constitutes the airfoil of the wind turbine blade 31 together with the other portions. The outer skin material 41 and other portions may be formed of, for example, a glass fiber plastic layer or a core material. Note that the structure is not limited to this structure, and the portion other than the spar cap 42 may be configured such that a glass fiber plastic laminate or a glass fiber plastic foam is simply disposed.

The spar cap 42 is mainly formed of a fiber reinforced composite member, and can be divided into a plurality of parts by at least one dividing line 43 in the blade length direction. In that case, each division | segmentation site | part of the spar cap 42 is joined by the above-mentioned joining method. In the example shown in FIGS. 5 and 6, one spar cap 42 is provided on each of the back side and the abdomen side of the wind turbine blade 31.
A shear web 44 may be provided between the spar cap 42 on the back side of the wind turbine blade 31 and the spar cap 42 on the abdomen side. The shear web 44 extends in the blade length direction in the internal space of the outer skin material 41.

  Specifically, the spar cap 42 includes a first fiber reinforced composite member 10 that is a set of first fiber reinforced rod members 11 including a resin and a fiber bundle, and a set of second fiber reinforced rod members 21 that include a resin and a fiber bundle. And the second fiber-reinforced composite member 20. The 1st fiber reinforced composite member 10 has the 1st recessed part 16 and the 1st convex part 15, and the 2nd fiber reinforced composite member 20 has the 2nd convex part 25 and the 2nd recessed part 26 (FIG. 1). To FIG. 4).

In the method for manufacturing a wind turbine blade according to an embodiment, a butting step of abutting the end of the first fiber reinforced composite member 10 with the end of the second fiber reinforced composite member 20, A joining step for joining the end portion and the end portion of the second fiber-reinforced composite member 20.
In the butting step, the second convex portion 25 of the second fiber reinforced composite member 20 is fitted into the first concave portion 16 of the first fiber reinforced composite member 10.
In the joining step, the end portions of the first fiber reinforced composite member 10 and the end portions of the second fiber reinforced composite member 20 are in a state where the ends of the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 are abutted with each other. A resin is injected into the gap between the two and the resin is cured.
Other configurations are the same as those in the embodiment described with reference to FIGS.

  As described above, according to the above-described embodiment, after the second convex portion 25 of the second fiber reinforced composite member 20 is fitted into the first concave portion 16 of the first fiber reinforced composite member 10, the gaps are formed between these portions. Since the injected resin is cured and the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 are joined, the strength reliability at the joint portion can be maintained high. In addition, since the first fiber reinforced composite member 10 and the second fiber reinforced composite member 20 are configured by a set of the first fiber reinforced rod member 11 or the second fiber reinforced composite member 20, the first concave portion 16 or the second convex portion. The size of the portion 25 can be easily adjusted by the diameter of the first fiber reinforced rod member 11 or the second fiber reinforced composite member 20.

  As mentioned above, although embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to this, In the range which does not deviate from the summary of this invention, various improvement and deformation | transformation may be performed.

  For example, in the above-described embodiment, the fiber reinforced composite member joining method and the case where the joined body is applied to a wind turbine blade have been described, but the technology according to this embodiment is not limited to a wind turbine blade, for example, The present invention can also be applied to other members such as aircraft main wings, automobiles, ships, and railway vehicles.

DESCRIPTION OF SYMBOLS 1 Joining body 10 1st fiber reinforced composite member 10a End part 10b Base 11 1st fiber reinforced rod member 15,25 Convex part 15a, 25a End surface (convex part end surface)
16, 26 Recess 16b, 26b End face (recess end face)
17 boundary 20 second fiber reinforced composite member 21 second fiber reinforced rod member 30 wind turbine 31 wind turbine blade 31a blade root 31b tip 32 hub 33 rotor 34 nacelle 35 tower 41 outer skin 42 spur cap 43 dividing line 44 shear web

Claims (7)

  1. An end portion of a first fiber reinforced composite member that is a set of first fiber reinforced rod members including a resin and a fiber bundle, and a second fiber reinforced composite member that is a set of second fiber reinforced rod members including a resin and a fiber bundle. A butting step of matching the end,
    Joining the end of the first fiber reinforced composite member and the end of the second fiber reinforced composite member; and
    The end surface of at least one first fiber reinforced rod member is recessed with respect to the end surface of the surrounding first fiber reinforced rod member, and the end portion of the first fiber reinforced composite member has the at least one first fiber reinforced rod member. 1st recessed part is formed of 1 fiber reinforced rod member,
    At least one end face of the second fiber reinforced rod member protrudes from an end face of the surrounding second fiber reinforced rod member, and the end portion of the second fiber reinforced composite member has the at least one second end. The 2nd convex part is formed with 2 fiber reinforced rod members,
    In the butting step, the second convex portion of the second fiber-reinforced composite member is fitted into the first concave portion of the first fiber-reinforced composite member,
    In the joining step, the end portion of the first fiber reinforced composite member and the second fiber reinforced composite member in a state where the end portions of the first fiber reinforced composite member and the second fiber reinforced composite member are abutted with each other. Injecting resin into the gap between the end of the, and curing the resin ,
    In the first fiber reinforced composite member, a plurality of the first fiber reinforced rod members are arranged in the width direction and the thickness direction, respectively.
    The said 2nd fiber reinforced composite member WHEREIN: The said 2nd fiber reinforced rod member is arranged in the width direction and the thickness direction, respectively , The joining method of the fiber reinforced composite member characterized by the above-mentioned.
  2. At the end of the first fiber reinforced composite member, a plurality of the first recesses are formed by the at least one first fiber reinforced rod member recessed with respect to the end surface of the surrounding first fiber reinforced rod member. Formed,
    At the end of the second fiber reinforced composite member, a plurality of the second protrusions are formed by the at least one second fiber reinforced rod member protruding relative to the end surface of the surrounding second fiber reinforced rod member. Formed,
    2. The fiber-reinforced composite member joining method according to claim 1, wherein, in the abutting step, the second convex portions are fitted into the plurality of first concave portions, respectively.
  3. At least one first protrusion is formed by the surrounding first fiber-reinforced rod member,
    At least one second recess is formed by the surrounding second fiber-reinforced rod member;
    3. The fiber-reinforced composite member according to claim 2, wherein in the butting step, the first convex portion of the first fiber-reinforced composite member is fitted into the second concave portion of the second fiber-reinforced composite member. Joining method.
  4. Wherein an end portion of the first fiber-reinforced composite member, said first recess with respect to the thickness direction of the first fiber-reinforced composite member and said first protrusion is provided alternately,
    Wherein the end of the second fiber-reinforced composite member, in claim 3, wherein the second recess with respect to the thickness direction of the second fiber-reinforced composite member and the second convex portions are provided alternately The joining method of the fiber reinforced composite member of description.
  5. An end portion of a first fiber reinforced composite member that is a set of first fiber reinforced rod members including a resin and a fiber bundle, and a second fiber reinforced composite member that is a set of second fiber reinforced rod members including a resin and a fiber bundle. A butting step of matching the end,
    Joining the end of the first fiber reinforced composite member and the end of the second fiber reinforced composite member; and
    The end surface of at least one first fiber reinforced rod member is recessed with respect to the end surface of the surrounding first fiber reinforced rod member, and the end portion of the first fiber reinforced composite member has the at least one first fiber reinforced rod member. 1st recessed part is formed of 1 fiber reinforced rod member,
    At least one end face of the second fiber reinforced rod member protrudes from an end face of the surrounding second fiber reinforced rod member, and the end portion of the second fiber reinforced composite member has the at least one second end. The 2nd convex part is formed with 2 fiber reinforced rod members,
    In the butting step, the second convex portion of the second fiber-reinforced composite member is fitted into the first concave portion of the first fiber-reinforced composite member,
    In the joining step, the end portion of the first fiber reinforced composite member and the second fiber reinforced composite member in a state where the end portions of the first fiber reinforced composite member and the second fiber reinforced composite member are abutted with each other. Injecting resin into the gap between the end of the, and curing the resin,
    A plurality of said first fiber-reinforced rod member forming the first fiber-reinforced composite member, the being coupled to each other at the base side of the first fiber-reinforced composite member, said end portion of said first fiber-reinforced composite member Are not bound to each other,
    A plurality of said second fiber-reinforced rod member forming the second fiber-reinforced composite member, the being coupled to each other at the base side of the second fiber-reinforced composite member, said end portion of said second fiber-reinforced composite member The fiber-reinforced composite member joining method according to any one of claims 1 to 4, wherein the fiber-reinforced composite members are not restricted to each other.
  6. A first fiber-reinforced composite member that is a set of first fiber-reinforced rod members including a resin and a fiber bundle;
    A second fiber reinforced composite member that is a set of second fiber reinforced rod members including a resin and a fiber bundle, and is joined to the first fiber reinforced composite member,
    In the first fiber reinforced composite member, a plurality of the first fiber reinforced rod members are arranged in the width direction and the thickness direction, respectively.
    In the second fiber reinforced composite member, a plurality of the second fiber reinforced rod members are arranged in the width direction and the thickness direction, respectively.
    The end face of at least one of the first fiber reinforced rod members is recessed with respect to the end face of the surrounding first fiber reinforced rod member, and the end of the first fiber reinforced composite member has the at least one of the first fiber reinforced rod members. The first recess is formed by the fiber reinforced rod member,
    The end face of at least one second fiber reinforced rod member protrudes from the end face of the surrounding second fiber reinforced rod member, and the at least one second fiber reinforced composite member is formed at the end of the second fiber reinforced composite member. The second convex part is formed by the fiber reinforced rod member,
    The ends of the first fiber reinforced composite member and the second fiber reinforced composite member so that the second convex portion of the second fiber reinforced composite member is fitted in the first concave portion of the first fiber reinforced composite member. A fiber-reinforced composite member joined body characterized in that the parts are butted together and joined.
  7. A method of manufacturing a wind turbine blade including an outer skin material and a spar cap provided to extend in the blade length direction,
    The spar cap is a first fiber reinforced composite member that is a set of first fiber reinforced rod members that include a resin and a fiber bundle, and a second fiber reinforced composite that is a set of second fiber reinforced rod members that include a resin and a fiber bundle. Including parts,
    A butting step of abutting the end of the first fiber reinforced composite member and the end of the second fiber reinforced composite member;
    Joining the end of the first fiber reinforced composite member and the end of the second fiber reinforced composite member; and
    The end surface of at least one first fiber reinforced rod member is recessed with respect to the end surface of the surrounding first fiber reinforced rod member, and the end portion of the first fiber reinforced composite member has the at least one first fiber reinforced rod member. 1st recessed part is formed of 1 fiber reinforced rod member,
    At least one end face of the second fiber reinforced rod member protrudes from an end face of the surrounding second fiber reinforced rod member, and the end portion of the second fiber reinforced composite member has the at least one second end. The 2nd convex part is formed with 2 fiber reinforced rod members,
    In the butting step, the second convex portion of the second fiber-reinforced composite member is fitted into the first concave portion of the first fiber-reinforced composite member,
    In the joining step, the end portion of the first fiber reinforced composite member and the second fiber reinforced composite member in a state where the end portions of the first fiber reinforced composite member and the second fiber reinforced composite member are abutted with each other. Injecting resin into the gap between the end of the, and curing the resin ,
    In the first fiber reinforced composite member, a plurality of the first fiber reinforced rod members are arranged in the width direction and the thickness direction, respectively.
    In the second fiber reinforced composite member, a plurality of the second fiber reinforced rod members are arranged in the width direction and the thickness direction, respectively .
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US7959058B1 (en) * 2005-01-13 2011-06-14 The United States Of America As Represented By The Secretary Of The Navy Hybrid composite welded joint
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