JP2001208120A - Shock energy absorbing member made of fiber reinforced plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock energy absorbing member capable of effectively absorbing shock energy of the multi-directional shock, and reducing damage of a transport member, a building and the like to the utmost to protect an occupant in the transport member even if a moving body such as an automobile collides while spinning. SOLUTION: In this column-like energy absorbing member formed of fiber reinforced fiber made of reinforced fiber and matrix resin, a fiber content varies with a region of the member. According to one embodiment, the shock energy absorbing member is provided with an energy absorbing part 4 on the surface thereof having a grid-shaped plane 7 formed by at least three grid points 6 different in a fiber content.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact energy absorbing member used in the technical field of vehicles such as automobiles and electric trains, and more particularly, to damage to occupants and vehicles during collision or rear-end collision of these vehicles. The present invention relates to improvement of a fiber reinforced plastic impact energy absorbing member for reducing and protecting the impact energy.

[0002]

2. Description of the Related Art As a conventional impact energy absorbing member made of a fiber reinforced plastic, an energy absorbing member made of a fiber reinforced resin is used, for example, as shown in FIG. A device to which an absorbing member 3 is attached is known (for example,
No. 6-300068).

The absorbing member 3 not only absorbs impact energy well, but also has a light weight for mounting on an automobile.
High rigidity is required, and a material made of fiber-reinforced resin is suitable as a constituent material. Further, in order to absorb energy efficiently at the time of collision, the absorbing member 3 is formed with a tapered portion serving as a start (trigger) of destruction on the side where a load is applied, so that destruction occurs successively. Some of them are described (for example, JP-A-8-219215).

[0004] However, in the case of these FRP shock absorbing members, it is necessary to dispose a plurality of shock absorbers in multiple directions when the impact force acting on the transport body extends in multiple directions. Also,
If the vehicle is an automobile, the vehicle often spins and collides.If an impact force is applied in an unexpected direction, the vehicle will not be sequentially destroyed, and the energy absorption of the absorbing member will not be sufficient. Was.

[0005] As described above, the conventional FRP energy absorber has a structure in which the energy absorbing member is sequentially broken and a predetermined energy absorbing characteristic is exhibited. No consideration was given to the impact from the vehicle.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and can effectively absorb impact energy even from impacts from multiple directions and is a condition for starting destruction. Provided is an impact energy absorbing member that does not require the tapered portion and that can minimize damage to a transport body or a building and protect an occupant in the transport body even if a mobile body such as an automobile collides while spinning. The purpose is to do.

[0007]

In order to achieve the above object, the present invention comprises the following first and second inventions.

A first aspect of the present invention is a columnar energy absorbing member made of a fiber reinforced resin comprising a reinforced fiber and a matrix resin, wherein the fiber content varies depending on the location of the absorbing member. It is an impact energy absorbing member.

[0009] In a second aspect, the surface of the absorbing member is provided with
An impact energy absorbing member made of fiber reinforced plastic, comprising an energy absorbing portion having a lattice-shaped plane formed from at least three lattice points.

The portions having different fiber contents are, depending on the shape of the member, cross-sections of the columnar body, where the thickness changes, for example, intersections and non-intersections (see FIG. 2) in the case of a lattice. And it is preferable to make the difference in this part within the range of 1.2 times to 3.0 times. By providing a portion where the fibers intersect in the absorbing member, the destruction proceeds stably and the amount of energy absorption increases. A more preferable specific member shape is to provide an energy absorbing portion in a lattice-shaped plane formed from at least three lattice points on the surface. Here, the reason why at least three lattice points are required is that the three lattice points form an energy absorbing member having an energy absorbing portion of one lattice shape plane. With such a configuration, each of the grid points has the same effect of reducing the impact energy as the conventional columnar and cylindrical shock absorbers, and the grid points in each grid are located in the matrix resin. Since the reinforcing fibers of (1) and (2) intersect to form a laminated structure, the fiber content is higher than that of other parts, and as a result, the rigidity is high and the energy absorption efficiency is high. In addition, since the lattice points in each energy absorbing portion have a three-dimensional shape and a plurality of lattice points, it is possible to effectively absorb impact energy with respect to impacts from a wide range of directions. In addition, as another independent effective means, by having a void in the member as a trigger for sequential destruction, energy can be favorably absorbed even in the event of an oblique impact.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

2 to 5 are perspective views of one embodiment of the impact energy absorbing member according to the present invention, and FIG. 2 shows an energy absorbing portion 4 having grid points having a grid-like outer shape. This is an example in which the number of lattice points 6 is four. At these lattice points, the amount of reinforcing fibers is greater than at other sites, and the strength is non-uniform. For this reason, the member is not entirely destroyed by the impact force from the oblique direction, but is sequentially destroyed, and exhibits high energy absorption characteristics. That is, there is a mechanism in which a portion having a small number of reinforcing fibers serves as a trigger for destruction, and a portion having a large number of reinforcing fibers is sequentially broken to absorb energy. Of course, the amount of the reinforcing fiber can be increased other than at the lattice point, but from the viewpoint of manufacturing a member using a continuous fiber having a higher energy absorption described later, the reinforcing fiber is crossed at the lattice point. It is economically preferable to increase the fiber content at lattice points.

As a method for increasing the fiber content other than at lattice points, for example, a method of inserting a separately molded or separately preformed base material may be used.

FIG. 3 shows an absorbing portion 8 having a cross-shaped lattice point, FIG. 4 shows an absorbing portion 9 in which a large number of curvilinear, rather than rectangular, lattices are gathered at random, and FIG. Is an absorber 10 in which a plurality of rectangular cylindrical bodies are assembled and integrated to form lattice points.

As shown in each figure, there are various lattice points such as a cross-girder, a cross, a curve, and an aggregate, but these are merely examples. In the embodiment of FIG. As the energy absorbing section 4, the projections 5 project in the traveling direction of the moving body (the direction of the arrow in the figure), and collectively form a plurality of lattice points 6 (intersections of the projections 5). Should be formed. Although not shown, the absorbing section 4 is fixed to the above-described bumper 2 of FIG. 1, a dedicated base body, or the like to constitute an impact energy absorbing member of the present invention.

Here, the plane area of one lattice 7, that is, the plane area of a portion surrounded by four lattice points 6 is 1
It is preferably in the range of 〜1000 cm 2. The thickness is more preferably 5 to 500 cm 2 in consideration of effective absorption of impact energy and production cost. Lattice area is 1c
If it is less than m2, the production cost is high, and since the distance between the lattice points is small, the sequentially destroyed FRP enters the lattice, which makes it difficult to successively destroy, and there is a problem that the impact energy cannot be efficiently absorbed. With a certain amount of reinforcing fiber used, the member may be insufficient in rigidity, and may not sufficiently exhibit the energy absorbing effect.

The thickness (t) of the projection 5 is 0.1 to 5
It is preferably within the range of 0 mm. The reason is that if it is less than 0.1 mm, the rigidity becomes insufficient, and the lattice points 6 become small, so that sufficient impact energy cannot be absorbed. On the other hand, if it exceeds 50 mm, the production cost is high due to the large amount of fiber, and the weight is also large, so that it is difficult to install it on a transportation body or the like.
In consideration of the production cost and the impact absorption energy per unit weight, it is more preferably in the range of 3 to 30 mm. The plane area of one grid 7 is as described above, but the specific size of one side is 10 to 300 mm.
Is preferable. More preferably, it is 30 to 200 mm. The absorbing section as shown in FIG. 2 is suitable for attaching to a large area such as a door or a side wall.

In the case of the column-shaped absorbing portion 8 in the shape of a cross as shown in FIG. 3, the length of one side is preferably in the range of 10 to 300 mm. More preferably, it is 30 mm to 200 mm.

The columnar absorbing portion 8 has a relatively high directionality, such as a bumper located before and after the transporting body, and is suitable for mounting to a place where large impact energy absorption is required.

In the case of the absorber 9 having the curved projections 10 as shown in FIG. 4, the plane area of the lattice is 1 to 1000 cm 2.
Is preferably within the range. More preferably 5 to 500 cm2
It is. This embodiment requires a design, such as an outer wall of a transport body or bumpers located in front and rear, and is suitable for installation in a place where it is difficult to install the absorbers 4 and 8 as shown in FIGS. ing.

The plane area 7 of these gratings and the thickness t of the projections, that is, the size of the grating, is determined by the magnitude of the impact energy to be absorbed and the mounting area. Each energy absorbing portion is preferably a board-shaped one having a ratio (H / L) of a height (t) at a lattice point to a width (L) of a side adjacent to the lattice point (1/2) or more. Also, of course, the absorbing section 4
Since the rigidity is increased by the lamination structure of the reinforcing fibers (described later in detail) in which the lattice points 6 forming the lattice are present, the energy absorption rate is high. Therefore, the absorption energy increases as the number of lattice points 6 increases. That is, according to the knowledge of the inventor, the absorption energy per unit area can be increased by reducing the lattice area A and increasing the number of lattice points 6. On the other hand, when the grid is small, the lay-up of the base material becomes complicated, so that the manufacturing cost increases. The size of the grid depends on the required absorbed energy and installation area,
Adjust according to manufacturing cost. As described above, the energy absorbing member can increase the amount of absorbed energy per unit area as compared to the case where the energy absorbing member does not have a lattice shape,
Also, the energy absorption amount can be adjusted by appropriately adjusting the number of lattice points. Specifically, according to the knowledge of the inventor, the absorbed energy per unit area is 90%.
J / cm2 or more, absorption energy per weight is 40
Those having J / g or more are preferred. If the absorbed energy per unit area is 90 J / cm2 or less and the absorbed energy per weight is 40 J / g or less, a predetermined impact energy is absorbed, but the volume becomes large and the weight becomes heavy.

The absorbing portion 10 shown in FIG. 5 is formed by gathering and integrating columnar impact energy absorbing portions into a lattice shape. In order to produce many kinds of energy absorbing parts 4, 8, and 9 of FIGS. 2 to 4 having different overall sizes, preparation of a mold and production of a preform of a base material are troublesome, and the integral molding is difficult. Although it is often difficult, in the case of the collecting part 10 of the collective type shown in FIG. 5, the manufacture is remarkably facilitated. In any of the above types, the shape, size, thickness, height, and the like of the grating that constitutes the absorbing portion need not be constant, and may differ partially depending on the shape of the mounting portion. It does not matter.

FIG. 6 shows an example of mounting the various impact energy absorbing parts 4, 8, 9 and 10 described above. In the figure, the absorbing part 10 of the embodiment shown in FIG.
Is provided with the absorbing portion 4 of the embodiment of FIG. That is, by fixing in a board shape, it is possible to easily cover the surface of a large-area structure such as a side wall of a railway vehicle or an airplane, a side wall of a door of an automobile, or a bumper. Further, even in the case where the structure is considered to be difficult to mount normally, including polygons and curved surfaces, a plurality of predetermined small pieces are cut out from the large-area lattice-shaped absorbing member, and these are appropriately assembled to obtain a desired shape. An absorbing member can be easily obtained. In addition, there is also an advantage that the replacement area in the case where the member is damaged by an impact can be minimized by making the pieces smaller. Furthermore, even when the structure has irregularities, the length of the lattice can be adjusted and attached to the structure by simple machining. In addition, a cushioning material made of a polymer material such as a foamed foam material, a cushioning material made of a ceramic such as foam mortar and cement, and a cushioning material made of a metal such as aluminum foam or aluminum honeycomb are partially provided in the lattice of the absorbing member. Or, it may be filled entirely. Further, by covering a part, one side, or both sides of the grid with a board made of the above-mentioned polymer material or ceramic material, impacts from various directions can be transmitted uniformly or over a wide range. That is, the above-mentioned organic or inorganic material board is attached to the upper, lower, or upper and lower portions in the axial direction (collision direction) of these energy absorbing portions, and can be easily attached to the installation target with an adhesive or the like. .

Each of the above-mentioned absorbers according to the present invention comprises a reinforcing fiber and a matrix resin.

The reinforcing fibers are not particularly limited, but inorganic fibers such as carbon fibers, glass fibers, alumina fibers and silicon nitride fibers, and organic fibers such as aramid fibers can be used.

As the inorganic fiber, the carbon fiber may be any of PAN (polyacrylonitrile) type and pitch type. Among them, PAN type carbon fiber is preferable because it has excellent compression characteristics. The glass fiber is preferably a general-purpose product which is inexpensive and has a basis weight of 20 to 400 g / m 2 for reasons such as moldability and impact energy absorption.

Specific examples of the organic fibers include polyamide synthetic fibers, polyolefin synthetic fibers, polyester synthetic fibers, polyphenylsulfone fibers, polybenzoxazine fibers, acetate, acrylonitrile synthetic fibers, modacrylic fibers, and polyvinyl chloride. Synthetic fiber,
Examples include polyvinylidene chloride-based synthetic fibers, polyvinyl alcohol-based synthetic fibers, polyurethane fibers, polyclar fibers, protein-acrylonitrile copolymer fibers, fluorine-based fibers, polyglycolic acid fibers, phenol fibers, and para-aramid fibers. Among these, for the absorbent member of the present invention, those having characteristics of a fiber tensile strength of 1.0 GPa or more and a tensile modulus of 70 Gpa or more are preferable. Considering that the absorbing member is attached to a transporter, the specific strength to weight, the specific elasticity is better,
Specifically, carbon fibers, glass fibers, and aramid fibers having a specific strength of 1.1 or more and a specific elasticity of 30 or more are preferable.

As the form of these reinforcing fibers, long fibers,
It is preferable that the fiber reinforced resin is formed by arranging short fibers, woven, mat, non-woven, or a mixture of these forms in a matrix resin regularly or irregularly. Most preferred is a long fiber form because of high energy absorption and ease of molding, and the arrangement direction is preferably randomly arranged in all directions. Further, a surface finish such as an oil agent, a coupling agent, a sizing agent, and a leveling agent may be applied to the surface of the reinforcing fiber in order to improve compatibility with the resin.

As the matrix resin, a thermosetting resin such as an unsaturated polyester resin, a vinyl ester resin, an epoxy resin, a phenol resin, and a benzoxazine resin;
Alternatively, thermoplastic resins such as polyethylene, polypropylene resin, polyamide resin, ABS resin, potybutylene terephthalate resin, polyacetal resin, polyphenylene sulfide resin, and resin such as polycarbonate;
And modified resins obtained by alloying these resins.
Among them, epoxy resin with excellent chemical resistance, weather resistance, etc.
Polyester resins, vinyl ester resins and modified resins of these resins are preferred. The above resins include, for example, known flame retardants such as phosphate esters, halogenated hydrocarbons, antimony oxide and zinc borate, phosphorus-containing polyols, bromine-containing polyols, phthalic anhydride tetrachloride, and phthalic anhydride tetrabromide. May be added to impart flame retardancy. The mixing ratio of the reinforcing fibers to the entire absorbent portion is preferably in the range of 10 to 70% by weight with respect to the resin. 10
%, The impact absorption performance may not be sufficient, and if it exceeds 70%, impregnation of the resin becomes difficult, and the impact energy absorption may also be insufficient. Void amount (volume content) is 1 to 102 to 6%
Is preferred. In general, the void content is preferably less than 1% in terms of mechanical properties. However, in the present invention, due to the existence of the void to some extent, the void functions as a trigger even in the case of an impact from an oblique direction, so that the sequential breakage is smooth. Proceed to Most preferred is 2-6%. The method for measuring voids conforms to JIS K7053 or K7075, but any 50 cross sections (area is 10 × 10 cm 2) with a microscope
May be obtained from the average area.
Note that the void is not an opening in the lattice, but an engineered M
aterial Handbook. Vol.1, "Composites", ASM Internat
As described in ional, 1987, etc., it is a pore contained in the resin, and often has a spherical shape. The size of the voids is preferable in a volume acts as the progressive failure of the trigger within the scope of 0.4 mm ³ to 5 mm ^3. If the volume is larger than this, the strength of the member may decrease and it may be difficult to break sequentially, and if it is less than this range, it may be difficult to act as a trigger for sequential damage to oblique low energy impact. Because there is a nature. The volume to the total void 0.4 mm ³ to 5 mm ³
Is more preferably 70% or more.

The method for producing voids within this range includes a method in which a resin used as a matrix is kneaded at a high speed in an air or nitrogen atmosphere, or a method in which a gas is dissolved by stirring, a method in which a foaming agent is used, and the like. There is. When the resin is cured under high pressure as in a conventional autoclave, the bubbles are dissolved in the resin, so if the void size is to be within the above range, molding should be performed under a pressure near normal pressure. Is preferred. Further, the amount of voids can also be adjusted by adding a surfactant or an antifoaming agent. Specifically, adding an antifoaming agent reduces the amount of voids,
As the amount of addition increases, the amount of voids decreases. These defoaming agents, surfactants, and the above-mentioned foaming agents may be mixed directly with the resin or may be previously attached to the fiber. Furthermore, the amount of voids is also affected by the morphology of the fiber. Specifically, since the size of the void increases with the diameter of the fiber, the diameter of the reinforcing fiber is preferably in the range of 5 to 20 microns. In addition, the amount of voids can be increased by twisting the fiber. Cloth (woven)
The braid or braid is a preferred form because it easily forms voids at the portion where the fiber is bent, such as the intersection of the warp and the weft.

Finally, in addition to the trigger by the void, a tapered portion may be provided at the tip of the lattice-like member as in the related art.

The method of forming the FRP shock absorbing member of the present invention includes a hand lay-up method, a pultrusion method (pull-out molding method), a resin transfer molding (RTM) method, a SCRIMP method, a pull wind method, and a filament wind method. Any known molding technique such as a pre-pre-gray-up method can be used. Above all, it is preferable in terms of performance to use a pull-out (pultruding) molding method in which the fiber bundle is integrally molded while being impregnated with a resin. The hand lay-up method is suitable for small-volume production and complex / special structures. In particular, in the lattice-shaped shock absorbing portion, the fibers are arranged in the lattice-shaped mold groove by the above-described hand lay-up method, and the resin is poured into the mold groove to have a desired lattice shape with high work efficiency. It is preferable to obtain a fiber-reinforced absorbent member. Molding under normal pressure is more preferable in terms of cost in forming the voids.

[0033]

Examples and Comparative Examples Example 1 Hereinafter, examples of the impact energy absorbing member according to the present invention will be described.

As the energy absorbing section 4 shown in FIG.
Using an unsaturated polyester resin as a matrix resin and a glass fiber as a reinforcing fiber, a cross-girder absorbent member (average fiber content is 30%, fiber content at lattice points is 56%) was prepared.

The specific dimensions are 40 mm per piece and 40 m in height.
m, a columnar absorber having four lattice points 2 having a thickness of 3 mm. A compression test was carried out at a load cell of 30 tons and a crosshead speed of 2 mm / min using Instron-1128 as the absorbing member.

The results are shown in FIG. 9 showing a load-displacement curve of the absorbing member. The area surrounding this curve and the x-axis is the absorbed energy. When the energy absorption amount of the present absorbing member is obtained from the area, it is 1800 J, the weight is 35 g, and the cross-sectional area is 16 cm.
² , the absorbed energy per unit weight and the absorbed energy per unit area are 51.4 J /
g, 410 J / cm ² . In addition, when the void amount of this member was measured by JISK7053, it was 3%.

COMPARATIVE EXAMPLE 1 For comparison, a cylindrical absorbent member (FIG. 10) having a uniform fiber content of 50% was similarly tested. As a result, a curve shown in FIG. 11 was obtained, and the energy absorbed per unit weight and the energy per unit area were obtained. The absorbed energy is 42 J / g and 160 J / c, respectively.
m ² , and the absorbed energy was lower than that of Example 1 above. That is, the lattice-shaped absorbing member of Example 1 in FIG. 2 has higher absorption energy per unit weight and area.

Example 2 A columnar member having the same structure as that of Example 1 was made of Instron-1128, a load cell was 30 tons, and a crosshead speed was 2
A compression load test was performed at an angle of 10 ° with respect to the height direction of the member at a rate of mm / min.

As a result, the member was sequentially broken, and the absorbed energy per unit weight and the absorbed energy per unit area were 49.7 J / g and 396 J / cm ² , respectively.

COMPARATIVE EXAMPLE 2 The same cylinder as in Comparative Example 1 was subjected to a compression test from a diagonal direction of 10 degrees, as in Example 2. As a result, the cylinder was sheared and broken into two pieces, and the absorbed energy per unit weight and the absorbed energy per unit area were 8 J / g and 30 respectively.
J / cm ² .

Examples 3 to 5 As the energy absorbing portion 4 shown in FIG. 2, an unsaturated polyester resin was used for the matrix resin and 1
Two-turn twisted glass fiber and carbon fiber (modulus of elasticity: 235 GPa, elongation: 2%) are used at a fiber ratio of 1: 1 to form a cross-girder member (size is 40 mm on a side and 5 mm in height).
(0 mm, thickness: 5 mm, average fiber content: 25%, fiber content at lattice points: 44%) were manufactured by the hand lay-up method (normal pressure). In this production process, the amount of voids is adjusted by kneading the unsaturated polyester resin in the air so as to foam it and changing the curing temperature to room temperature (25 ° C.), 40 ° C., 60 ° C., and 80 ° C. If it is too high, the viscosity of the resin decreases and the amount of voids decreases), and three types of cross-girder members having different void amounts shown in Table 1 were obtained. Note that the result of the cross section of the microscopic observation, voids spherical, size those 0.5 mm ³ to 2 mm ³ was almost (more than 70%). These well members were subjected to a compression test in the same apparatus as in Example 2 from an oblique direction of 30 ° C. The results are as shown in Table 1. Those having a void amount of 1.8% and 6.1% had the highest energy absorption amount against oblique collision. Table 1 below summarizes the above results.

[0042]

[Table 1]

[0043]

The impact energy absorbing member according to the present invention has the following remarkable functions and effects.

1) In a columnar energy absorbing member made of FRP made of a reinforcing fiber and a matrix resin, the fiber content is varied for each part of the member. In addition to the energy absorption, there is no need for a trigger such as chamfering to start destruction.

2) Since the impact energy absorbing portion has a lattice shape, the lattice points have a three-dimensional shape with the reinforcing fibers crossing each other, so that the rigidity against impacts from multiple directions is high and the energy absorption efficiency is high. Therefore, the absorbed energy per unit can be increased as compared with the conventional absorbing member.

3) Since the reinforcing fibers intersect at the lattice points as described above, the rigidity is high and the energy absorption efficiency is high. Therefore, by adjusting the number and arrangement of the lattice points, the amount of absorbed energy can be adjusted according to the purpose of use.

4) By arranging the grids in a plane and fixing the entire structure to a board-shaped or curved-shaped shock absorbing member, shock energy can be absorbed with respect to shocks from a wide range of directions.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a usage example of a conventional impact energy absorbing member.

FIG. 2 is a perspective view showing one embodiment of an impact energy absorbing member according to the present invention.

FIG. 3 is a perspective view of an impact energy absorbing member according to an embodiment of the present invention, which is different from the absorbing member of FIG. 2;

FIG. 4 is a perspective view of an impact energy absorbing member according to the present invention in an embodiment different from the absorbing members of FIGS.

FIG. 5 is a perspective view of an impact energy absorbing member according to the present invention in an embodiment different from the absorbing members of FIGS.

FIG. 6 is a perspective view showing an application example of the impact energy absorbing member according to the present invention.

FIG. 7 is a front view of a mounting example of the energy absorbing unit of the present invention.

FIG. 8 is a perspective view showing dimensions of an absorbing section in FIG. 2;

FIG. 9 is a diagram showing a load-displacement curve of the energy absorbing unit according to the present invention.

FIG. 10 is a perspective view of an absorbing section in a comparative example.

11 is a load-displacement curve diagram of an energy absorbing portion of the absorbing member of FIG.

[Explanation of symbols]

 1: Car 2: Bumper 3: Energy absorption part 4: Energy absorption part 5: Projection part 6: Lattice point 7: Lattice (lattice shape plane) 8: Absorption part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08J 5/04 CER C08J 5/04 CEZ CEZ B29K 101: 00 // B29K 101: 00 105: 06 105: 06 B29L 31:30 B29L 31:30 C08L 101: 00 C08L 101: 00 B29C 67/14 P

Claims (12)

[Claims] 1. A columnar energy absorbing member made of a fiber reinforced resin comprising a reinforcing fiber and a matrix resin,
An impact energy absorbing member made of fiber reinforced plastic, wherein the fiber content varies depending on the location of the absorbing member. 2. The impact energy absorbing member made of fiber reinforced plastic according to claim 1, wherein the fiber content varies within a range of 1.2 to 3.0 times at a portion where the thickness changes. 3. An impact energy absorbing member made of fiber-reinforced plastic, comprising an energy absorbing portion having a lattice-shaped plane formed by at least three lattice points on a surface of the absorbing member. 4. The fiber-reinforced plastic impact energy according to claim 3, wherein the fiber content of the lattice points is higher than that of the parts other than the lattice points within a range of 1.2 to 3.0 times. Absorbing member. 5. The impact energy absorbing member made of fiber reinforced plastic according to claim 3, wherein the area of the lattice-shaped plane formed by the three lattice points is in the range of 1 to 1000 cm ^2. . 6. The thickness of the energy absorbing portion in the collision direction is:
The impact energy absorbing member made of fiber reinforced plastic according to any one of claims 3 to 5, wherein the impact energy absorbing member is within a range of 0.1 to 50 mm. 7. The energy absorbing portion has a ratio (H / L) between a height (t) at a grid point and a width (L) of an adjacent side of the grid point.
The impact energy absorbing member made of fiber reinforced plastic according to any one of claims 3 to 6, wherein the member is a board having a shape of 1/2 or more. 8. The fiber-reinforced plastic impact energy absorbing member according to claim 3, wherein a part or all of the lattice is filled with a foamed foam or a foamed mortar. 9. An upper part, a lower part in an axial direction of the energy absorbing part,
9. The impact energy absorbing member made of fiber reinforced plastic according to claim 3, wherein an organic or inorganic material board is attached to the upper and lower portions. 10. The fiber-reinforced plastic impact energy according to claim 1, wherein the reinforcing fiber is a carbon fiber and its content is in a range of 10 to 70 wt%. A shock absorbing member. 11. The amount of voids in the energy absorbing portion is 2-6.
3. The composition according to claim 1, wherein the content is within the range of vol.
0. The impact energy absorbing member made of a fiber reinforced plastic according to any one of the above items. 12. The fiber-reinforced plastic impact energy absorbing member according to claim 1, wherein an energy absorption amount is 40 J / g or more.