JPH05459A - Structure component using fiber reinforced resin composite material - Google Patents

Abstract

PURPOSE:To strengthen a plate end section by forming a curved face of large diameter on the plate end section of a component or forming a beading shape so that the fiber is not cut by the plate end section. CONSTITUTION:A side beam consist of a web 11a formed by FRP, a flange 11b and a plate-shaped core 12 with folded both ends forming a curved face. FRP is formed by rotating cloth-shaped prepregs. composed of fibers in one direction by 45 deg. and laminating the same in multi-folds in the four directions, and side beams, transverse beams and end beams are arranged as if integrated and wound in a manner of not cutting the fibers in the prepregs. As the core material 12 is put in so that the curvature radius of fibers is not getting smaller at the plate end section of the component, the fibers have not to be cut at the plate end section even if the prepregs in which fibers are arranged with resin are laminated in multi-folds in the four directions while being shifted by approximately 45 deg., and the strength at the plate section of FRP is not at all lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural member made of a fiber reinforced resin composite material (hereinafter referred to as "FRP"), and more particularly to a beam or frame structure.

[0002]

2. Description of the Related Art When weight reduction is required for main strength members of various structures, FRP using high-strength fiber is an object of consideration, and particularly for main members of traffic machines, weight reduction is strictly required. Therefore, FRP is frequently used. For example,
It is described in detail in “Next Generation Composite Material Technology Handbook” published by Japan Standards Association (published in 1990.31.31). Pg. 61, Figures 2, 1 and 24 of that publication, Angle, P. 255
2, 2, 166, I-shaped material of carbon fiber three-dimensional fabric,
Tables 4, 2 and 5 on page 518 describe various structural materials for aircraft. The tensile strength of the fiber that strengthens FRP is greater than that of metal, and continuous fibers must be used to take advantage of this feature. FR
The elongation of the fiber that strengthens P is much smaller than that of metal, so if the fiber is bent like a metal, the fiber will break. Since the FRP fiber cannot be bent with a small curve radius at the plate end of the beam or frame, it is often necessary to cut the fiber at the plate end that requires the most strength. A bogie frame of a railroad vehicle will be described as a representative of beams and frames using the conventional FRP which is the subject of the present invention.

FIG. 9 is a plan view and FIG. 10 is a front view of a bogie frame composed of a conventional beam made of FRP, and FIG. 11 is an enlarged cross-sectional view taken along line EE of FIG. An enlarged view of the FF section is shown in FIG. 12, and an enlarged view of the GG section of FIG. 9 is shown in FIG. 61 is a side beam made of FRP, 62 is a lateral beam made of FRP, 63 is an end beam made of FRP, and the side beam 61 is a web 61.
a beam having an I-shaped cross section composed of a and a flange 61b, a horizontal beam 62 being a beam having a groove-shaped cross section composed of a web 62a and a flange 62b, and an end beam 63 being a web 6.
It is a beam having a groove-shaped cross section constituted by 3a and a flange 63b.

A bogie frame made of a beam having an I-shaped section or a groove-shaped section made of FRP is intended mainly for weight reduction, and the plate thickness of the side beam 61, the lateral beam 62, and the end beam 63 is very large. The major premise is that it is composed of thin things. As a method of molding these members by FRP, a cloth-like tape in which fibers are arranged in one direction (“prepreg”)
It is called 45 degrees by 45 degrees and laminated in 4 directions (-45 degrees, 0 degrees, 45 degrees, 90 degrees 4
A stacking method in which multiple layers are stacked on the basis of stacking in the direction, and a property called pseudo-isotropic property) is widely used in various transportation members. The fiber itself that reinforces FRP has a very small elongation of the material and may differ by more than an order of magnitude compared with metal. The characteristic feature of these fibers used in FRP is that they have a very high tensile strength, and if they do not use continuous fibers, they will effectively use the large tensile strength that is most characterized compared to metals. Can't do it.

When a cloth-like prepreg in which fibers are arranged in one direction is rotated by 45 ° and laminated in four directions, a plate end portion,
That is, it is essential in terms of strength that the fibers are continuous between the front and back of the plate at the flange end. However, if the plate thickness of the member is made thin, the fiber may not be able to bend at the flange end due to the small elongation of the fiber, and the fiber end will come to the flange end and the flange end will not be strengthened. There was a problem. Therefore, in order to strengthen the flange end, it is necessary to have a structure in which the fibers can be continuous.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the beam and the frame constituted by, the fiber important for strength is cut at the plate end of the member, and there is a problem that the strength of the FRP is reduced.

An object of the present invention is to reinforce the plate ends of the members of the beam or frame mainly composed of FRP, thereby reducing the weight of the member and at the same time providing the beam or frame in which the strength is balanced. Is intended.

[0008]

In order to achieve the above object, a curved surface having a large radius is provided at the plate end of the member, or a bead shape is used so that the fiber is not cut at the plate end. It is a thing.

Further, in order to have a curved surface at the plate end portion, a core material is provided at the plate end portion and a cloth-like prepreg in which fibers are arranged in one direction is laminated on the outer periphery thereof.

Furthermore, in order to form a curved surface at the plate end and to reduce the weight, a hollow core material is used and a prepreg is laminated on the outer periphery thereof.

Then, in order to prevent the fibers from being cut at the plate ends and at the same time to make the inner surface side of the flange flat, a plate-shaped core material is put in the flange and a prepreg is laminated on the outer periphery thereof. .

[0012]

[Function] Since the core material is inserted so that the bending radius of the fiber does not become small at the plate end of the member, even if the prepregs in which the fibers are lined with the resin are shifted by about 45 ° and laminated in four directions There is no need to cut the fiber at the plate end, and the strength does not decrease at the plate end of the FRP.

As the core material, a round bar-shaped material may be used at the end of the plate, or a hollow cylindrical material may be used. Also,
In some cases, a plate-shaped core material is used in the flange or a hollow plate-shaped core material is used in order to make both front and back surfaces of the flange flat. Further, the core members may be joined together by thin plates or small needle-shaped core rods to maintain the dimension between the core members.

[0014]

The beam and frame of the present invention can be used as a strength member for all structures, but the most applicable object is a main member of a traffic machine. In particular, since weight reduction is rigorously pursued in major strength members such as aircraft and railway vehicles, weight reduction by FRP or the like has been studied and variously adopted as these strength members. In the present invention, an example of a bogie frame is shown in FIG.
It will be described with reference to FIG. It should be noted that the present invention is not necessarily limited to railway vehicles.

FIG. 1 is a plan view of the bogie frame of the present invention formed by FRP and FIG. 2 is a front view thereof. FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2 and enlarged sectional view taken along line BB of FIG. FIG. 4 is a diagram, FIG. 5 is an enlarged cross-sectional view taken along line CC of FIG.
FIG. 6 shows an enlarged view of the D cross section, FIG. 7 shows a hollow plate-shaped cross section of the core member, and FIG. 8 shows a hollow cylindrical cross section of the core member.

Reference numeral 11 is a side beam arranged in the longitudinal direction of the bogie frame, and the side beam 11 is a web 11a formed by FRP.
And a flange 11b and a plate-shaped core member 12 having both ends rounded to have a curved surface. Reference numeral 21 is a horizontal beam that connects the side beams 11 to the left and right, and the horizontal beam 21 is composed of a web 21a formed by FRP, a flange 21b, and a round bar-shaped core material 22. Reference numeral 31 is an end beam that connects the side beams 11 to the left and right, and the end beam 31 is made up of a web 31a formed by FRP, a flange 31b, and a plate-shaped core member 32 having both ends rounded to have a curved surface.

Web 11a, Flange 11b, Web 2
1a, flange 21b, web 31a, flange 31b
Is an FRP, and these are cloth-like prepregs in which fibers are arranged in one direction rotated by 45 ° and laminated in multiple layers in four directions. Side beams 11, lateral beams 21, end beams 31 The fibers in the prepreg are wound so as not to be cut because they can be made as one piece.
The prepreg is wound around the outer circumference of a plate-shaped core material 12 having rounded ends and a curved surface, a round bar-shaped core material 22, and a plate-shaped core material 32 having rounded ends and a curved surface. The core members 12, 22, 32 may be connected to each other to maintain the positional relationship between the core members, and the core members may be connected by thin plates or small needle-shaped core rods. In some cases, the positional relationship is retained. Since all the core members 12, 22, 32 are curved so that the plate ends of the side beams 11, the lateral beams 21, and the end beams 31 are curved, the core members 12, 22, 32 are wound around the outer periphery of the core members 12, 22, 32. All the fibers are bent with a large radius, and there is no choice but to cut the fibers.

In the cross-sectional view of the flange portion of the I-shaped cross section shown in FIG. 7 in which the core material is a hollow plate shape, the plate-shaped core material 41 having both ends rounded to have a curved surface is a hollow plate shape. In the cross-sectional view of the end portion of the plate shown in FIG. 8 in which the core material has a hollow cylindrical shape, the core material 51 has a hollow cylindrical shape. The core materials 41 and 51 are both hollow to reduce the weight. In FIG. 7, the FRP member 42 in which cloth-like prepregs in which fibers are arranged in one direction are rotated by 45 ° and stacked in multiple layers in four directions is arranged, and the core material 41 bends the fibers of the FRP member 42. A convex portion 41a having a large radius is provided. In FIG. 8, a cloth-like prepreg in which fibers are arranged in one direction is rotated by 45 °, and an FRP member 52 in which multiple layers are laminated in four directions is arranged, and the core material 51 bends the fibers of the FRP member 52. A convex portion 51a having a large radius is provided. A large concave curved surface is provided on each of the convex portions 41a and 51a so that the fiber can be bent with a large curve radius.

In this embodiment, the fiber is not bent at a small radius and the fiber itself is not cut.
The strength of the fibers used in the RP can be fully exerted. Therefore, according to the present embodiment, the strength desired for the FRP is maintained as it is, so that the weight of the member can be reduced without hesitation, and the strength member can be reduced by the FRP.

The beam or frame of the present invention can be applied to any beam as long as it requires weight reduction.

[0021]

Since the present invention is constructed as described above, it has the following effects.

Since the core having a curved surface is installed inside the plate end, it is not necessary to cut the fiber at the plate end.
The plate edge is strengthened. Furthermore, since the bead is provided at the plate end, the plate end is also strengthened by the bead itself.

Further, since the hollow core material is put in the plate end portion or the plate portion, the mass of the core material itself can be kept small, and further, the FRP itself causes a strong defect portion at the plate end portion. Without such a situation, the fibers in the FRP are effectively arranged, and the weight of the entire member can be reduced.

Therefore, the beam or frame using the FRP of the present invention eliminates variations in strength, which in turn has the effect of reducing the weight.

[Brief description of drawings]

FIG. 1 is a plan view of a bogie frame constituted by a beam of the present invention made of FRP.

FIG. 2 is a front view of FIG.

3 is an enlarged cross-sectional view taken along the line AA of FIG.

4 is an enlarged cross-sectional view taken along the line BB of FIG.

5 is an enlarged cross-sectional view taken along line CC of FIG.

FIG. 6 is a magnified view taken along the line DD of FIG.

FIG. 7 is a cross-sectional view of the core material of the present invention in the shape of a hollow plate.

FIG. 8 is a cross-sectional view in which the core material of the present invention has a hollow cylindrical shape.

FIG. 9 is a plan view of a bogie frame composed of conventional beams made of FRP.

FIG. 10 is a front view of FIG. 9.

11 is an enlarged cross-sectional view taken along line EE of FIG.

12 is an enlarged view taken along line FF of FIG.

FIG. 13 is an enlarged view taken along line GG of FIG.

[Explanation of symbols]

11, 61 ... Side beams, 11a, 21a, 31a ... Web,
11b, 21b, 31b ... Flange, 12, 22, 3
2, 41, 51 ... Core material 21, 62 ... Horizontal beam, 31, 63
... end beams, 41a, 51a ... convex portions, 42, 52 ... FRP members.

Claims (9)

[Claims] 1. A core material having a curved surface is provided inside a plate end,
A structural member using a fiber-reinforced resin composite material, characterized in that fibers are wound around the outer surface of the core material. 2. A structural member using the fiber reinforced resin composite material according to claim 1, wherein the core material is formed into a round bar shape. 3. A structural member using the fiber-reinforced resin composite material according to claim 1, wherein the core material is plate-shaped. 4. A structural member using the fiber reinforced resin composite material according to claim 1, wherein the core material is a hollow cylinder. 5. A structural member using the fiber-reinforced resin composite material according to claim 1, wherein the core material is a hollow plate. 6. A structural member using the fiber-reinforced resin composite material according to claim 1, wherein the core materials are bonded together. 7. A structural member using a fiber reinforced resin composite material according to claim 6, wherein the core members are joined together by a thin plate. 8. A structural member using a fiber-reinforced resin composite material according to claim 6, wherein the core members are connected by a needle-shaped core rod. 9. A structural member using the fiber-reinforced resin composite material according to claim 1, wherein a convex portion having a large concave curved surface is provided on the core material.