JPH0436905Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a joint designed to improve the bonding strength between members in an integrally molded structure of fiber-reinforced composite material.

(Prior art) As shown in FIGS. 7 to 10, the conventional integrally molded joint structure of a fiber-reinforced composite material is devised in shape using only the fiber-reinforced composite material 10 (FIG. 7), and a thread 11. They can be sewn together (Fig. 8), joined with arrowhead-shaped fittings 12 (Fig. 9), or inserted into the corners with metal or hardened fiber-reinforced composite material 13 and bonded with adhesive 14 (Fig. 10). Ta.

(Problem to be solved by the invention) In the case where the shape is devised using only the fiber reinforced composite material 10 (Fig. 7), the load is withstood only by the resin between the members, so the parts where the peeling force is applied are The problem was that it easily peeled off. Further, in the case of inserting a metal or a hardened fiber-reinforced composite material into the corner (FIG. 10), only an adhesive was used instead of the resin, but the same drawbacks as those described above existed. Furthermore, the methods of sewing with thread (Figure 8) and connecting with arrowhead-shaped metal fittings (Figure 9) not only require special equipment, but also have drawbacks such as being difficult to apply to actual structures. Ta.

The present invention attempts to solve the above-mentioned conventional problems, by adding whiskers such as silicon carbide to the resin part, and increasing the bonding strength between the parts by the whiskers.
The present invention aims to provide a joint with an integrally molded joint structure that is lighter and easier to apply to actual structures.

(Means for solving the problem) Therefore, the present invention provides a filler made of fiber reinforced composite material at the boundary of a joint made by laminating members made of fiber reinforced composite material, and An adhesive having a lattice-like or mesh-like base material sprinkled with whiskers such as silicon carbide, or a fiber-reinforced composite material impregnated with resin is inserted around or inside, and molded and hardened at the same time as the above-mentioned member and filler. This is done in such a way that it is used as a means to solve problems.

(Function) When molding and curing the fiber-reinforced composite material, excess resin is removed, but along with this resin, the adhesive fluid and whiskers flow and become entangled with the fibers at the joints of the parts.
Improve the strength of joints.

(Embodiments) The present invention will be described below with reference to embodiments of the drawings. FIGS. 1 to 6 show embodiments of the present invention. First, the first embodiment shown in Figs. 1 and 2 will be explained. Figs.
When applying an integrally molded structure to a part where peeling force such as fuel pressure or air pressure acts, filler 4 and member 1, member 2, member 3
An adhesive or resin-impregnated fiber-reinforced composite material 5 with whiskers 7 sprinkled thereon is inserted between the two and molded and cured at the same time, as shown in FIGS. 3 and 4.

Next, the second embodiment will be explained with reference to FIG. 5. In this embodiment, the width of the plate member 1 in FIG. 1 is shortened to form an I-shaped beam. An adhesive or resin-impregnated fiber-reinforced composite material 5 with whiskers sprinkled thereon is inserted into the same location as in the example, and is simultaneously molded and cured for reinforcement.

Next, the third embodiment will be explained with reference to FIG. 6. In this embodiment, when a joint having three or more arms 8 is made by laminating fiber reinforced composite materials, there is Then, the adhesive or resin-impregnated fiber-reinforced composite material 5 sprinkled with whiskers is inserted, and molded and cured at the same time.

(Effects of the invention) As explained in detail above, the present invention provides an adhesive or resin-impregnated fiber reinforced composite material sprinkled with whiskers.
Insert it into the integrally molded joint or inside the filler,
By molding and curing at the same time, a reinforcing effect by whiskers can be obtained, making it easy to apply to actual structures.

[Brief explanation of the drawing]

Fig. 1 is a side view of a joint showing an embodiment of the present invention, showing the arrangement of each member in the first embodiment before assembly; Fig. 2 is a side view of the joint after molding and hardening;
The figure is a side view of an adhesive or resin-impregnated fiber reinforced composite material with whiskers sprinkled on it, FIG. 4 is a front view of the same, and FIGS. 5 and 6 are joints showing the second and third embodiments of the present invention, respectively. The side view, FIG. 7, FIG. 8, FIG. 9, and FIG. 10 are side views of a joint using a conventional fiber-reinforced composite material, respectively. Explanation of the main parts of the diagram, 1, 2, 3... members, 4
...Filler, 5...Resin-impregnated fiber reinforced composite material.

Claims (1)

[Scope of utility model registration request] A filling material made of fiber reinforced composite material is arranged at the boundary of a joint made by laminating members made of fiber reinforced composite material, and whiskers such as silicon carbide are scattered around or inside the filling material in a lattice shape or A joint characterized in that an adhesive having a mesh-like base material or a fiber reinforced composite material impregnated with a resin is inserted and molded and hardened simultaneously with the member and filler.