JPS63247025A - Joint structure for metal cylinder and fiber reinforced plastic cylinder - Google Patents

Abstract

PURPOSE:To enhance the strength of bonding section of a metal cylinder and a FRP cylinder by inserting a projected section of the metal cylinder into a channel section of the FRP cylinder, and bonding the outer surface of a FRP ring integrated with the outer periphery of said projected section to the inner surface of said channel. CONSTITUTION:A projected section 6 is formed by shaving the inner and outer peripheral surfaces of ends of a metal cylinder 5, and a channel 7 of U-shaped section is formed on the end surface of a FRP cylinder 1. Recessed sections 9 are formed respectively on the inner and outer peripheral surfaces of the projected section 6, and fiber reinforced plastic ring 10 of thermoplastic resin is inserted into said recessed sections 9, outside of which a fiber reinforced plastic ring 8 of U-shaped section prepared by thermoplastic resin is covered. The ring 8 and the ring 10 are heated and integrated with the projected section 6, and said projected section 6 is inserted into the channel 7, while the outer surface of the integrated ring 8 is bonded to the inner periphery of the channel section 7. By said arrangement, the bonding section of the metal cylinder and the FRP cylinder is constituted of FRP to enhance the bonding strength.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a metal cylinder and a fiber-reinforced plastic (hereinafter referred to as
This relates to a cylindrical joint structure (called FRP).

[Conventional technology]

Conventionally, in order to reduce the weight of the FRP cylinder 1, there is a structure in which a buoyant body 4 with a small specific gravity is sandwiched between an inner cylinder 2 and an outer cylinder 3 of FRP.

When connecting the metal cylinder 5 to such an FRP cylinder 1,
If the two are connected by bolting or the like, the fibers of the FRP will be cut, which will significantly reduce the strength of the FRP.

For this reason, conventionally, when connecting the FRP cylinder 1 and the metal cylinder 5, the following joint structure has been adopted.

That is, as shown in FIGS. 2 and 3, the inner circumferential surface and outer circumferential surface of the end of the metal cylinder 5 are shaved to form protrusions 6, and the FRP is
A groove 7 having a U-shaped cross section is formed on the end surface of the cylinder 1, and an FRP ring 8 having a U-shaped cross section is adhered to the inner surface of the groove 7, and the projection 6 of the metal cylinder 5 is fitted into this FRP ring 8. The outer surface of the projection 6 is bonded to the inner surface of the FRP ring 8.

[Problem that the invention seeks to solve]

By the way, joining different materials such as metal and FRP,
Bonding strength varies depending on the surface condition of the metal, and FR
The shear strength is weaker than that of P-to-P bonding.

Therefore, when a bending moment is applied to an FRP cylindrical container using the above joint structure due to an impact, an external force in a direction perpendicular to the axis of the cylinder acts, and the outer surface of the protrusion 6 of the metal cylinder 5 is The adhesive part between the inner surface of the FRP IJ song and the protrusion 6 of the metal cylinder 5 is peeled off due to shear force.
is extracted from the inner surface of the FRP ring 8, and the metal cylinder 5 and the FR
There is a risk that the P cylinder 1 will separate.

Therefore, the present invention aims to increase the bonding strength between the metal cylinder 5 and the FRP cylinder 1.

[Means for solving problems]

In order to solve the above problems, the present invention forms recesses 9 on the inner and outer peripheral surfaces of the protrusion 6, respectively, and fills the four parts 9 with thermoplastic resin, as shown in FIG. The used fiber-reinforced plastic ring 10 is fitted, and a fiber-reinforced plastic ring 8 made of thermoplastic resin and having a U-shaped cross section is placed on the outside thereof, and this fiber-reinforced plastic ring 8 having a U-shaped cross section and the fiber-reinforced plastic ring 10 are combined. is heated and integrated with the projection 6, and this projection 6
was fitted into the groove 7 of the fiber-reinforced plastic cylinder 1, and the outer surface of the fiber-reinforced plastic ring 8 integrated with the outer periphery of the projection 6 was adhered to the inner periphery of the groove 7.

[Effect]

In the joint structure configured as described above, since the FRP IJ song 0.8 is integrally bonded to the outer surface of the protrusion 6 of the metal cylinder 5, the bond between the metal cylinder 5 and the FRP cylinder 1 is This will increase the strength of the joint.

〔Effect of the invention〕

As described above, according to the joint structure of the present invention, since the joint portion between the metal cylinder 5 and the FRP cylinder 1 is made of FRP, the joint strength between the two is high.

Therefore, the metal cylinder 5 and the FRP cylinder 1 connected by the joint structure of the present invention have the effect of withstanding a large bending moment. For example, as shown in FIG.
When a three-point bending test was carried out by connecting metal cylinders 5 to both sides of the cylinder 1, the results showed that the joint structure of the present invention was superior to the conventional joint structure as shown in the table below. It had about twice the bending strength.

Therefore, by using the joint structure of this invention,
Since the joint strength between the metal cylinder and the FRP cylinder is increased, it becomes possible to apply it to fields that require more severe usage conditions than conventional joint structures.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view of a joint structure between a metal cylinder and a fiber-reinforced plastic cylinder according to the present invention, FIG. 2 is a sectional view showing a conventional joint structure, and FIG. 3 is a partially enlarged sectional view of FIG. 2. , FIG. 4 is a schematic diagram showing a joint strength test method.

Claims (1)

[Claims] A protrusion 6 is formed by scraping the inner and outer circumferential surfaces of the end of the metal cylinder 5, a groove 7 having a U-shaped cross section is formed on the end face of the fiber-reinforced plastic cylinder 1, and the protrusion 6 is inserted into the groove 7. In a joint structure of a metal cylinder and a fiber-reinforced plastic cylinder formed by fitting and bonding the outer surface of the projection 6 to the inner surface of the groove 7, recesses 9 are formed on the inner and outer peripheral surfaces of the projection 6, respectively.
A fiber-reinforced plastic ring 10 made of thermoplastic resin is fitted into the recess 9, and a fiber-reinforced plastic ring 8 made of thermoplastic resin with a U-shaped cross section is placed on the outside of the ring 8. The fiber-reinforced plastic ring 8 and the fiber-reinforced plastic ring 10 are heated and integrated with the projection 6, and the projection 6 is fitted into the groove 7 of the fiber-reinforced plastic cylinder 1.
A joint structure of a metal cylinder and a fiber-reinforced plastic cylinder, characterized in that the outer surface of a fiber-reinforced plastic ring 8 integrated on the outer periphery is adhered to the inner surface of the groove 7.