JP5357586B2 - FRP molded product - Google Patents

Description

  The present invention relates to an FRP molded product having a joint between FRP and a metal.

  FRP (Fiber Reinforced Plastic) is light weight and excellent in tensile strength, weather resistance, and the like, and has been conventionally used as an external component material for ships.

  When the FRP is applied to a ship, it is necessary to fix the end of the FRP to a hull structural member made of a steel plate or the like. For this purpose, conventionally, the end of the FRP is hung using a fastener such as a bolt. It was fixed to. However, in this method, since a fastener such as a bolt is passed through the FRP and fixed to the hull structural member, stress is concentrated on the fastening portion of the FRP, and the fastening strength is significantly reduced due to damage to the FRP. Had a problem.

  For this reason, an FRP molded product having an FRP-metal joint part in which a part of metal is embedded in FRP and integrated has been proposed. FIG. 9 shows an example of the FRP molded product. In FIG. 9, 1 is a metal such as a steel plate, 2 is a core material made of a resin having a plate shape thicker than the metal 1, and the core The material 2 includes a tapered surface 3 that is inclined so that the thickness decreases toward the end portion on the surface (upper surface) in order to join the metal 1 having different thicknesses in a butt-contact state. The end face 4 having a thickness equivalent to the thickness of the metal 1 is formed at the end of the tapered face 3.

  In order to manufacture the FRP molded product, a lower fiber reinforcing material 6 is laminated on a forming table 5 as shown in FIG. 9, and the end surface 4 of the core material 2 is formed on the fiber reinforcing material 6. The core material 2 and the metal 1 are disposed so that the end portions of the metal 1 are in contact with each other, and then the upper fiber reinforcing material 7 is formed to have a required thickness so as to extend over the core material 2 and the metal 1. Laminated and arranged. At this time, the fiber reinforcing materials 6 and 7 are arranged so as to cover all the front and back surfaces of the core material 2, and a part of the metal 1 in the width direction is exposed to the metal 1. Arrange as follows. In such a state, the FRP is formed by impregnating the resin in the fiber reinforcing materials 6 and 7 and the core material 2 and curing them, thereby forming the FRP, and thereby the FRP molding having the joint 8 in which the FRP and the metal 1 are integrated. Forming a thing.

  As a method of impregnating the fiber reinforcing materials 6 and 7 and the core material 2 with the resin, all the portions of the core material 2 and the metal 1 covered with the fiber reinforcing materials 6 and 7 are wrapped with the surrounding film, and the inside of the surrounding film is vacuumed. Vacuum impregnation method in which the resin is impregnated by injecting the resin into the surrounding film, and the press-impregnation in which the resin is placed in the mold and impregnated by pressure injection of the resin. In general, a vacuum impregnation method is preferred from the viewpoints of work efficiency, uniformity of resin impregnation, and the like.

  As a prior art document showing an FRP molded product having a joint where FRP and metal are integrated as described above, there is Patent Document 1 and the like.

JP 2007-015187 A

  However, as shown in FIG. 9, in order to abut against the metal 1 the core material 2 whose thickness is increased with respect to the metal 1 in order to increase the rigidity strength, It is necessary to provide the taper surface 3 so that the end surface 4 equivalent to the thickness of the metal 1 is formed. For this reason, the taper of the core material 2 is formed at the joint 8 between the FRP and the metal 1 formed by resin impregnation. A dog-shaped shape changing portion 9 extending from the surface 3 to the surface of the metal 1 is formed, and for this reason, stress is concentrated near the joint portion 10 between the core material 2 and the metal 1. There is. Therefore, when a force in the direction of bending the joint portion 10 acts on the joint portion 8 of the FRP molded product, between the core material 2 and the fiber reinforcements 6 and 7 in the vicinity of the joint portion 10 and between the metal 1 and the fiber. There is a problem that peeling occurs between the reinforcing materials 6 and 7, and when the peeling occurs, there is a problem that the strength of the joint portion 8 is remarkably lowered.

  Further, since a reverse-shaped shape changing portion 12 is formed in the vicinity of the start portion 11 of the taper surface 3 where the taper surface 3 is formed from the upper surface of the core material 2, the start portion of the taper surface 3 is formed. There is a problem that stress is concentrated also in the vicinity of 11, and therefore there is a problem that separation occurs particularly between the core material 2 and the upper fiber reinforcing material 7 in the vicinity of the start portion 11 where stress is concentrated. When it occurred, the strength of the joint 8 was lowered.

  Further, Patent Document 1 describes that the strength of the joint is increased by providing an opening in the metal and arranging a fiber reinforcing material in the opening. In this structure, a plurality of openings are formed in the metal. There is a problem that the cost increases because the work and the work of arranging the fiber reinforcing material in each opening are necessary. Further, even if configured in this way, as shown in FIG. 1 is not strengthened at all, stress concentrates on the joint 10, and between the core material 2 and the fiber reinforcements 6 and 7 in the vicinity of the joint 10, and the metal 1. The problem of delamination between the fiber reinforcements 6 and 7 cannot be prevented. Therefore, Patent Document 1 has a problem that the strength of the joint cannot be increased.

  An object of the present invention is to provide an FRP molded article having an FRP-metal joint that can increase the strength of the FRP-metal joint at low cost.

According to the present invention, an end of a plate-like metal is close to an end of a core material having a plate shape thicker than the metal and having a tapered surface that decreases in thickness toward the end. An FRP molded article having a joint part in which FRP obtained by forming a FRP by resin impregnation and a metal are integrated, and a fiber reinforcing material is arranged on the front and back so as to extend from the core material to a part of the metal. And
A diamond-shaped additional core material arranged in conformity with the shape change portion formed by the tapered surface and the upper surface of the metal, and an additional material arranged so as to cover the outer surface of the additional core material and the core material and the metal surface The present invention relates to an FRP molded product having a fiber reinforcement and an FRP reinforcing layer formed by resin impregnation .

  Moreover, in the FRP molded product, it is preferable that the end portion of the metal is disposed so as to wrap on the back surface corresponding to the tapered surface of the core material.

  Further, in the FRP molded product, a notch portion capable of fitting the end portion of the metal is provided on the back surface corresponding to the tapered surface of the core material, and the end portion of the metal is fitted into the notch portion, thereby forming the core material. It is preferable to wrap.

  According to the FRP molded product of the present invention, FRP molding having a joint portion in which FRP obtained by forming a metal and a core material thicker than the metal by resin impregnation using a fiber reinforcing material and the metal is integrated. Since the FRP reinforcement layer that is reinforced by FRP molding is provided in the shape change part formed in the joint part by the taper surface of the core material, the stress of the core material and the metal joint part where stress is particularly concentrated As a result, it is possible to effectively reduce the strength of the joint between the FRP and the metal.

  Further, as described above, in addition to providing the FRP reinforcing layer in the shape change portion, the metal end portion is wrapped on the back surface corresponding to the taper surface of the core material, so that the joint portion between the FRP and the metal is provided. This has the effect of further improving the strength.

It is a cutting | disconnection side view which shows the reference example of the FRP molded product in this invention. It is a manufacturing process figure which shape | molds the FRP reinforcement layer of FIG. It is a cutting | disconnection side view which shows the modification of FIG. It is a cut side view which shows the other reference example of the FRP reinforcement layer with which FIG. 1 was equipped. It is a cutting | disconnection side view which shows the Example of this invention . It is a cutting | disconnection side view which shows the form applicable to this invention . It is a cutting | disconnection side view which shows the different form applicable to this invention . It is a cut side view which shows another reference example of a FRP molded product . It is a cutting | disconnection side view which shows an example of the conventional FRP molding which has a junction part of FRP and a metal.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a cut side view showing a reference example of the FRP molded product in the present invention. In FIG. 1, the same components as those in FIG.

  In FIG. 1, as shown in FIG. 9, in the FRP molded product having the joint portion 8 in which the FRP and the metal 1 are integrated, the shape-shaped shape change portion 9 formed in the joint portion 8 by the tapered surface 3 is formed. The FRP reinforcing layer 100 is provided to be reinforced by FRP molding.

  That is, in the FRP molded product of FIG. 1, first, as shown in FIG. 2, the lower fiber reinforcing material 6 is laminated on the forming table 5 so as to have a required thickness. The core material 2 and the metal 1 are disposed on the upper portion so that the end face 4 of the core material 2 and the end of the metal 1 are in contact with each other. The fiber reinforcing material 7 is laminated and disposed so as to have a required thickness. Next, FRP is formed by impregnating and hardening the fiber reinforcing materials 6 and 7 and the core material 2 with resin. Thereby, the FRP molding which has the junction part 8 which FRP and the metal 1 integrated is formed.

Subsequently, an additional fiber reinforcing material 101 that covers the joint portion 10 with a required width is formed on the rectangular shape change portion 9 formed in the joint portion 8 by the tapered surface 3 of the core material 2. Laminate them so that they are thick. Next, the additional fiber reinforcing material 101 is impregnated with resin and cured to form the FRP reinforcing layer 100 reinforced by FRP molding including the additional fiber reinforcing material 101. Therefore, in the reference example of FIG. 1, the joint portion 8 in which the FRP reinforcing layer 100 made of the additional fiber reinforcing material 101 is integrally provided is formed in the dog-shaped shape changing portion 9 having the joint portion 10.

In addition, for the resin impregnation performed in the reference example of the present invention, any method such as the vacuum impregnation method, the press-fitting impregnation method, and the hand-coating impregnation method can be used. It is preferable to use a vacuum impregnation method in consideration of the above. Further, the fiber reinforcing materials 6 and 7 and the additional fiber reinforcing material 101 used in the reference example of the present invention include sheet fibers such as glass fibers and aramid fibers, mats, etc. in addition to carbon fibers, and required strength. Depending on the thickness, it can be used by being laminated to an arbitrary thickness. Further, as the core material 2, in addition to polyurethane, polystyrene, polyethylene, polypropylene, silicon, polyvinyl chloride, wood (such as a balsa material), or the like can be used. Further, as the resin to be impregnated, it becomes a matrix resin of the FRP molded product, and a thermosetting resin such as an epoxy resin, a vinyl ester resin, an unsaturated polyester resin, or the like can be used. Furthermore, as the metal 1, an aluminum plate or the like can be used in addition to the steel plate described above.

On the other hand, in the reference example , after forming the FRP molded product having the joint 8 of FRP and metal 1, the additional fiber reinforcing material 101 is disposed in the U-shaped shape change portion 9 and the FRP is reinforced by resin impregnation. Although the case where the layer 100 is formed integrally has been described, as another method, as shown in FIG. 2, the lower fiber reinforcement 6 is disposed on the molding table 5, and the upper part of the fiber reinforcement 6 is The core material 2 and the metal 1 are arranged in a state where the end face 4 of the core material 2 and the end of the metal 1 are in contact with each other, and then the upper fiber reinforcing material extends over the core material 2 and the metal 1. 7, and further, the additional fiber reinforcement 101 is disposed on the shape change portion 9 in the shape of a dog on the upper fiber reinforcement 7, and then the fiber reinforcements 6, 7, the additional fiber reinforcement 101 and the core. By simultaneously impregnating the material with a single operation, The RP reinforcing layer 100 may be formed of FRP having integrally.

In the reference example shown in FIG. 1, the FRP reinforcing layer 100 reinforced by FRP molding using the additional fiber reinforcing material 101 is integrally provided on the U-shaped change shape portion 9 of the joint portion 8. The strength of the joint-shaped portion 8 between the FRP and the metal 1 can be greatly increased.

  FIG. 3 shows a modification of FIG. 1. In FIG. 3, there is no sudden change in thickness at the start portion 11 of the tapered surface 3 formed by the upper surface of the core material 2 and the tapered surface 3. Further, a curved surface portion R formed in advance in a curved surface gently curved from the upper surface of the core material 2 to the tapered surface 3 or a shape close to a curved surface is provided.

  Thus, by forming the curved surface portion R at the start portion 11 of the taper surface 3, the problem of stress concentration on the start portion 11 of the taper surface 3 can be reduced, and thus the strength of the joint portion 8 between the FRP and the metal 1 can be reduced. Can be increased. Further, as described above, the work of processing the curved surface portion R on the start portion 11 of the tapered surface 3 of the core material 2 can be performed relatively easily.

FIG. 4 shows another reference example of the FRP reinforcing layer 100 provided in FIG. 1, with respect to the additional fiber reinforcement 101 that covers the U-shaped shape changing portion 9 as shown in FIG. 1. Further, a wide additional fiber reinforcing material 102 is arranged so as to cover from the V-shaped shape changing portion 9 to the inverted V-shaped shape changing portion 12 having the start portion 11 of the tapered surface 3. Next, the FRP reinforcing layer 100 reinforced by FRP molding including the additional fiber reinforcement 102 is formed by impregnating the additional fiber reinforcement 101 with resin and curing. Therefore, in the reference example shown in FIG. 4, an additional fiber reinforcing material is added to the V-shaped change portion 9 having the joint portion 10 and the V-shaped change portion 12 having the start portion 11 of the tapered surface 3. The joint portion 8 in which the FRP reinforcing layer 100 made of 102 is integrally provided is formed.

In the reference example shown in FIG. 4, the FRP reinforcing layer reinforced by the wide additional fiber reinforcing material 102 covering the joint 8 from the letter-shaped change part 9 to the letter-shaped change part 12. Since the joint 100 is provided integrally, the joint 8 is strongly reinforced, and the stress applied to the V-shaped shape changing portion 9 and the reverse V-shaped shape changing portion 12 is reduced. The strength of the joint 8 of the metal 1 can be further increased.

Figure 5 shows an example of FRP reinforcing layer 100 of the present invention, as described above, the state in which the upper portion of the fiber reinforcement 6, butt so that an end portion of the end surface 4 and the metal of the core material 2 abuts The FRP and metal obtained by arranging the core material 2 and the metal 1 and further arranging the upper fiber reinforcing material 7 so as to extend over the core material 2 and the metal 1 and forming FRP by resin impregnation. In an FRP molded product having a joint 8 in which 1 is integrated, a U-shaped change portion 9 formed by the tapered surface 3 and the upper surface of the metal 1 has a U-shaped change portion in cross section. 9 is disposed, and an additional fiber reinforcement 104 is also disposed so as to cover the outer surface of the additional core material 103 and the surfaces of the core material 2 and the metal 1. Next, the additional fiber reinforcement 104 and the additional core material 103 are impregnated with resin and cured to form the FRP reinforcing layer 100 reinforced by FRP molding including the additional core material 103 and the additional fiber reinforcement 104. Therefore, in the embodiment 3 shown in FIG. 5, the joint portion in which the FRP reinforcing layer 100 made up of the additional core material 103 and the additional fiber reinforcing material 104 is integrally provided in the U-shaped shape changing portion 9 having the joint portion 10. 8 is formed.

In the embodiment shown in FIG. 5, the additional core material 103 that covers the U-shaped shape change portion 9 is added to the joint portion 8, and the outer surface of the additional core material 103 and the surface of the core material 2 and the metal 1 are added. Since the FRP reinforcing layer 100 reinforced by the fiber reinforcing material 104 is integrally provided, the stress applied to the U-shaped shape changing portion 9 and the U-shaped shape changing portion 12 is further reduced. Therefore, the strength of the joint 8 between the FRP and the metal 1 can be further increased.

The present inventors have taken the cases of FIGS. 1, 4, and 5 as examples, and the maximum in-plane stress value (tensile / compressive stress) of the FRP in the joint portion 10 between the core material 2 and the metal 1 and the taper. The result of the maximum shear stress value obtained by carrying out the strength analysis of the core material 2 at the start portion 11 of the surface 3 is 1.00 as the conventional example shown in FIG.

  According to Table 1, according to Embodiments 1 to 3 of the present invention, the maximum in-plane stress of FRP in the joint portion 10 is reduced by 15% to 20% compared to the conventional example of FIG. The maximum shear stress of the core material 2 at the start portion 11 of 3 is reduced by 39% to 43% as compared with the conventional example of FIG. It is clear that the strength of the joint 8 of the metal 1 can be greatly increased.

FIG. 6 is a cut side view showing a form applicable to the FRP molded product of the present invention. In the form of FIG. 6, a case where the joint portion 8 is formed by arranging the end portion of the metal 1 so as to wrap on the back surface corresponding to the tapered surface 3 of the core material 2 is shown. That is, the lower fiber reinforcing material 6 is arranged on the molding table 5, the metal 1 is arranged on the upper part of the fiber reinforcing material 6, and the core material 2 is placed so as to be wrapped on the metal 1, and subsequently. Then, the upper fiber reinforcing material 7 is disposed so as to extend over the core material 2 and the metal 1, and in this state, the fiber reinforcing materials 6, 7 and the core material 2 are impregnated with resin and cured. By forming the FRP, the joint portion 8 in which the FRP and the metal 1 are integrated is formed.

  As described above, when the metal 1 is placed on the back surface of the core material 2 so as to be wrapped, the metal 1 protrudes downward from the middle of the back surface of the core material 2 by the thickness. It is preferable that a step 5 a having a depth corresponding to the thickness of the metal 1 is provided on the base 5. Moreover, although the edge part of the metal 1 may be the surface cut | disconnected at right angle, as shown in FIG. 6, providing the inclined surface 1a which thickness decreased gradually toward the back surface of the core material 2 may be provided. preferable.

  As shown in FIG. 6, since the metal 1 is wrapped on the back surface of the core material 2, it is not necessary to provide the end surface 4 as described above on the core material 2, and the sharp tip with the tapered surface 3 extended. Therefore, there is an advantage that the core material 2 can be easily processed.

FIG. 7 is a cut side view showing a different form from the FRP molded product shown in FIG. 6 applicable to the present invention . In the form of FIG. 7, a notch 2 a into which the end of the metal 1 can be fitted is provided on the back surface corresponding to the tapered surface 3 of the core material 2. And the metal 1 is made to wrap to the core material 2 by fitting the edge part to the said notch part 2a. In the form of FIG. 7, the metal 1 is fitted and wrapped in the notch 2a formed on the back surface of the core material 2, so that the back surface of the core material 2 and the back surface of the metal 1 become a uniform surface. The upper surface of 5 can be a flat surface.

  In the form of FIG. 6 and FIG. 7, since the joining portion 8 is formed so that the end portion of the metal 1 is wrapped on the back surface of the core material 2, the stress applied to the shape changing portions 9 and 11 due to this shape. Therefore, the strength of the joint 8 between the FRP and the metal 1 can be increased.

  Therefore, any one of the configurations of the FRP reinforcing layer 100 shown in the first to third embodiments of FIGS. 1 to 5 is selected with respect to the configuration of the joint portion 8 of the FRP and the metal 1 shown in FIGS. Apply. Then, the FRP and the metal 1 are joined by the synergy of the effect of improving the strength by wrapping the end portion of the metal 1 on the back surface of the core material 2 and the effect of improving the strength by providing the FRP reinforcing layer 100. The strength of the portion 8 can be significantly increased.

FIG. 8 is a cut side view showing another reference example of the FRP molded product in the present invention. FIG. 8 shows the reference example of FIG. 1 as an example , and the fiber reinforcements 6, 7 are formed at the end positions of the fiber reinforcements 6, 7 formed integrally with the metal 1 by forming FRP. In this case, a fastening bolt 13 is provided that is penetrated through the metal 1 and fastened. This configuration can be applied to any reference example other than FIG.

  As shown in FIG. 8, by fastening the end positions of the fiber reinforcements 6 and 7 together with the fastening bolts 13 penetrating with the metal 1, there is a problem that the ends of the fiber reinforcements 6 and 7 are separated from the metal 1. It can be prevented in advance.

  In each of the above embodiments, the end of the metal 1 exposed from the joint 8 on the side opposite to the joint is fixed to a hull structural member or the like by welding or bolting. Accordingly, the metal 1 may have a flat plate shape or a bent shape due to the engagement with the hull structural member or the like, and furthermore, a metal fitting having an arbitrary shape such as a T-shape may be attached. In addition, a mounting hole may be further formed.

  In addition, the FRP molded product of the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  The FRP molded product of the present invention can be used for various FRP molded products having a joint between FRP and metal in order to fix the FRP to a structural member or the like.

DESCRIPTION OF SYMBOLS 1 Metal 2 Core material 2a Notch 3 Tapered surface 6 Lower fiber reinforcement (fiber reinforcement)
7 Upper fiber reinforcement (fiber reinforcement)
8 Joint 9 Shape change part (shape change part)
10 Start portion of taper surface 12 Shape change portion in the shape of a letter (shape change portion)
DESCRIPTION OF SYMBOLS 100 FRP reinforcement layer 101 Additional fiber reinforcement 102 Additional fiber reinforcement 103 Additional core material 104 Additional fiber reinforcement R Curved surface part

Claims (3)

An end portion of the plate-like metal and an end portion of the core material having a plate shape having a thickness thicker than the metal and having a tapered surface whose thickness decreases toward the end portion are arranged close to each other, A fiber reinforced material is arranged on the front and back so as to cover a part of the metal from the core material, and is an FRP molded product having a joint part in which FRP and metal obtained by forming FRP by resin impregnation are integrated,
A diamond-shaped additional core material arranged in conformity with the shape change portion formed by the tapered surface and the upper surface of the metal, and an additional material arranged so as to cover the outer surface of the additional core material and the core material and the metal surface An FRP molded product comprising a fiber reinforced material and an FRP reinforcing layer formed by resin impregnation .   2. The FRP molded product according to claim 1, wherein the end portion of the metal is disposed so as to wrap on the back surface corresponding to the tapered surface of the core material.   A notch part into which the end of the metal can be fitted is provided on the back surface corresponding to the taper surface of the core material, and the end of the metal is fitted into the notch and wrapped with the core material. Item 2. The FRP molded article according to Item 1.

Images