IMPACT ABSORBING STRUCTURE

Abstract

An impact absorbing structure for a vehicle wherein the impact absorbing structure includes a metal beam and a resin crash pad installed on a side of the metal beam where an external impact is received, the resin crash pad is installed within a range in a longitudinal direction of the metal beam, the range including a site including a longitudinal direction center of the metal beam and receives the external impact, the resin crash pad is composed of a thermoplastic resin composition, and the thermoplastic resin composition constituting the resin crash pad has a flexural modulus if 1 to 20 GPa as measured using an ISO test piece obtained by injection molding, a bending test is performed in accordance with ISO 178 at a strain rate of 2 mm/min in an atmosphere at a temperature of 23° C. and a humidity of 50% to measure the flexural modulus.

Claims

1-9. (canceled)

10. An impact absorbing structure for a vehicle wherein the impact absorbing structure comprises a metal beam and a resin crash pad installed on a side of the metal beam where an external impact is received, the resin crash pad is installed within a range in a longitudinal direction of the metal beam, the range including a site including a longitudinal direction center of the metal beam and receives the external impact, the resin crash pad is composed of a thermoplastic resin composition, and the thermoplastic resin composition constituting the resin crash pad has a flexural modulus if 1 to 20 GPa as measured using an ISO test piece obtained by injection molding, a bending test is performed in accordance with ISO 178 at a strain rate of 2 mm/min in an atmosphere at a temperature of 23° C. and a humidity of 50% to measure the flexural modulus.

11. The impact absorbing structure according to claim 10, wherein a length of the resin crash pad is ⅛ to ½ of a total longitudinal length of the metal beam.

12. The impact absorbing structure according to claim 10, wherein the metal beam has an open cross section perpendicular to the longitudinal direction and has a length of 50 to 200 cm and a width of 5 cm or more.

13. The impact absorbing structure according to claim 10, wherein the metal beam has a closed cross section perpendicular to the longitudinal direction and has a length of 50 to 200 cm and a cross-sectional area of 10 cm.sup.2 or more.

14. The impact absorbing structure according to claim 10, wherein the thermoplastic resin composition constituting the resin crash pad has a tensile elongation at break of 1% or more as measured by using an ISO test piece obtained by injection molding, a tensile test is performed in accordance with ISO527-1 and -2 at a strain rate of 10 mm/min in an atmosphere at a temperature of 23° C. and a humidity of 50% to measure the tensile elongation at break.

15. The impact absorbing structure according to claim 10, wherein an increase in weight ΔW.sub.H and an increase in energy absorption amount ΔEA.sub.H due to addition of the resin crash pad to the metal beam alone satisfy equation (1) with respect to an increase in weight ΔW.sub.S and an increase in energy absorption amount ΔEA.sub.S due to an increase in thickness of the metal beam alone: $\Delta {\text{EA}}_{\text{H}}/\Delta {\text{W}}_{\text{H}}>\Delta {\text{EA}}_{\text{S}}/\Delta {\text{W}}_{\text{S}}$ wherein ΔW.sub.H = W.sub.H - W.sub.S (increase in weight due to addition of the crash pad to the metal beam with the same thickness) W.sub.H: weight of the impact absorbing structure comprising the metal beam and the resin crash pad W.sub.S: weight of an impact absorbing structure comprising the metal beam alone ΔEA.sub.H = EA.sub.H - EAs (increase in energy absorption amount due to addition of the crash pad to the metal beam with the same thickness) EA.sub.H: energy absorption amount of the impact absorbing structure comprising the metal beam and the resin crash pad EA.sub.S: energy absorption amount of an impact absorbing structure comprising the metal beam alone ΔW.sub.S =W.sub.SX -W.sub.SY (increase in weight due to an increase in thickness when using only the metal beam) (X > Y) Wsx: weight of an impact absorbing structure comprising a metal beam alone with a thickness of X (mm) W.sub.SY: weight of an impact absorbing structure comprising a metal beam alone with a thickness of Y (mm) ΔEA.sub.S = EA.sub.SX - EA.sub.SY (increased in energy absorption amount due to an increase in thickness when using only the metal beam) (X > Y) EA.sub.SX: energy absorption amount of an impact absorbing structure comprising a metal beam alone with a thickness of X (mm) EA.sub.SY: energy absorption amount of an impact absorbing structure comprising a metal beam alone with a thickness of Y (mm).

16. A side door of a vehicle comprising the impact absorbing structure according to claim 10.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIGS. 1(A) - 1(B) show a perspective view (A) and a side view (B) of an impact absorbing structure of when a metal beam has an open cross section, according to an example.

[0037] FIGS. 2(A) - 2(B) show an impact absorbing structure of when a metal beam has a closed cross section, according to another example, and show perspective views of (A) when a metal beam has a circular cross section and (B) when a metal beam has an elliptical cross section.

[0038] FIG. 3 is a perspective view showing an analysis model of when a pole collision is added as an external impact input for analysis of energy absorption by the impact absorbing structure shown in FIGS. 1(A) - 1(B).

[0039] FIGS. 4(A) - 4(B) show examples of deformation in the analysis model shown in FIG. 3, and shows schematic side views of (A) a metal beam only and (B) provided with a resin crash pad.

[0040] FIG. 5 is a graph showing the control characteristics of the collision speed of the pole in the analysis model shown in FIG. 3.

TABLE-US-00001 Explanation of Symbols 1, 11, 14: impact absorbing structure 2, 12, 15: metal beam 3, 13, 16: resin crash pad 21, 22: fulcrum 23: pole

DETAILED DESCRIPTION

[0041] Hereinafter, the impact absorbing structure will be explained in detail together with examples.

[0042] The impact absorbing structure is installed at a location that receives an impact stress from the outside and, concretely, there are a structure installing it on bumper reinforcement parts provided to front and rear sides of a vehicle and a structure installing it on a side impact beam part provided in a side door.

Metal Beam

[0043] A member constituting the metal beam can be applied to both an open cross section and a closed cross section as a cross section perpendicular to the longitudinal direction, and preferably have a length of 50 to 200 cm. In an open cross section, a wavy shape such as a W shape, an H shape or a hat shape is preferably used to improve the moment of inertia of area, and the width is preferably 5 cm or more, and generally about 5 to 20 cm. FIG. 1 shows an example of a concrete cross-sectional shape and an example of a positional relationship with the crash pad.

[0044] In an impact absorbing structure 1 shown in FIG. 1, a resin crash pad 3 is installed on the side of a metal beam 2 that receives an external impact and has a W-shaped cross section perpendicular to the longitudinal direction as an open cross section. The resin crash pad 3 is installed within the range in the longitudinal direction of the metal beam 2 at a site that receives an external impact, including the longitudinal direction center.

[0045] On the other hand, when the cross section perpendicular to the longitudinal direction of the metal beam has a closed cross-sectional shape, the hollow closed cross-sectional shape includes circular, elliptical and square cross-sectional shapes, and the cross-sectional shape and cross-sectional area may change in the middle of the longitudinal direction. As a general cross-sectional area, one having a cross-sectional area of 10 cm.sup.2 or more is preferably used. FIG. 2 shows examples of the concrete cross-sectional shape and examples of the positional relationship with the crash pad.

[0046] In an impact absorbing structure 11 shown in FIG. 2(A), a resin crash pad 13 is installed on the side of a metal beam 12 formed in a circular shape with a cross section perpendicular to the longitudinal direction as a closed cross-sectional shape, on the side receiving an external impact. The resin crash pad 13 is installed within the range of the metal beam 12 in the longitudinal direction, at a site of the side receiving an external impact including the longitudinal direction center.

[0047] In an impact absorbing structure 14 shown in FIG. 2(B), a resin crash pad 16 is installed on the side of a metal beam 15 formed in an elliptical shape with a cross section perpendicular to the longitudinal direction as a closed cross-sectional shape, on the side receiving an external impact. The resin crash pad 16 is installed within the range of the metal beam 15 in the longitudinal direction, at a site of the side receiving an external impact including the longitudinal direction center.

[0048] As materials for the metal beam, steels, aluminum alloys, titanium alloys, magnesium alloys, copper alloys, nickel alloys, cobalt alloys, zirconium alloys, zinc, lead, tin and alloys thereof are preferably exemplified. In particular, when the impact absorbing structure is used as a structure for a vehicle, as the materials for the metal member, high-strength high-tensile steel plates and lightweight and relatively inexpensive aluminum alloys are preferred.

Resin Crash Pad

[0049] Although the shape of the resin crash pad is not particularly limited, it is preferred that the resin crash pad is provided at a position including the central portion in the longitudinal direction (X direction) of the metal beam, and its length is ⅛ to ½ of the total length of the metal beam. It is preferred that the height (Y direction) is 1 to 100 mm from the design allowable space, and the width (Z direction) covers 90% or more of the entire width of the metal beam (for example, FIG. 2). Further, the average thickness of the crash pad is desirably 1.0 to 5.0 mm and, therefore, it is desirable to provide a honeycomb-shaped cavity from the viewpoints of moldability and weight (weight reduction).

[0050] It is necessary that the resin crash pad is not completely cut or crushed by an external impact and the external impact does not directly act on the metal beam, and it is preferably composed of a thermoplastic resin composition from the viewpoint of the molding method.

[0051] As concrete resin materials, for example, preferably exemplified are a polyamide resin, a polyester resin, a polyphenylene sulfide resin, a polyphenylene oxide resin, a polycarbonate resin, a polylactic resin, a polyacetal resin, a polysulfone resin, a tetrafluoropolyethylene resin, a polyetherimide resin, a polyamideimide resin, a polyimide resin, a polyethersulfone resin, a polyetherketone resin, a polythioetherketone resin, a polyetheretherketone resin, a polyethylene resin, a polypropylene resin, a polystyrene resin, and styrene-based resins such as an acrylonitrile/butadiene/styrene copolymer (ABS resin) , a polyalkylene oxide resin and the like. In addition, two or more of these may be mixed to form an alloy (mixture) as long as the properties are not impaired.

[0052] Among the above-described resin materials, a polyamide resin, a polyester resin, a polyphenylene sulfide resin, a polyphenylene oxide resin, a polycarbonate resin, an ABS resin, and a polypropylene resin are preferably used. In particular, a polyamide resin, a polyamide/polyolefin alloy resin, and a polycarbonate/polybutylene terephthalate alloy resin are preferred because of their excellent balance between tensile strength and tensile elongation.

[0053] The thermoplastic resin composition of the resin crash pad preferably has a tensile elongation at break of 1% or more from the viewpoint of excellent energy absorption performance of the impact absorbing structure provided with the resin crash pad. 2% or more is more preferable, and 5% or more is most preferable. It is preferably 200% or less, more preferably 100% or less.

[0054] The thermoplastic resin composition of the resin crash pad preferably has a flexural modulus of 1 GPa or more, more preferably 2 GPa or more, in the point that the energy absorption amount per weight increase of the impact absorbing structure provided with the resin crash pad is high. Further, it is preferably 20 GPa or less, more preferably 10 GPa or less.

[0055] Although the thermoplastic resin composition of the resin crash pad preferably has a tensile elongation at break of 1% or more and a flexural modulus of 1 to 20 GPa, one having a high tensile elongation at break and a high flexural modulus is preferable. Concretely, it is more preferred that the tensile elongation at break is 2% or more and the flexural modulus is 2 to 10 GPa.

[0056] It is possible to blend 10 to 100 parts by weight of fibrous filler with respect to 100 parts by weight of the thermoplastic resin within the range that satisfies the above-described properties. 20 to 90 parts by weight is more preferred, and 30 to 80 parts by weight is further preferred and is particularly preferred for achieving both mechanical strength and moldability.

[0057] As concrete fibrous fillers, exemplified are a glass fiber, a carbon fiber, a potassium titanate whisker, a calcium carbonate whisker, a wollastonite whisker, an aluminum borate whisker, an aramid fiber, an alumina fiber, a silicon carbide fiber, an asbestos fiber, and a gypsum fiber, and these can be used in combination of two or more. Further, pretreatment of these fibrous fillers with a coupling agent such as an isocyanate-based compound, an organic silane-based compound, an organic titanate-based compound, an organic borane-based compound or an epoxy compound is preferable from the viewpoint of obtaining a more excellent mechanical strength. Among them, a glass fiber is most preferably used.

[0058] The resin crash pad is made by molding a resin composition. As the molding method, a molding method using a mold is preferable, and various molding methods such as injection molding, extrusion molding and press molding can be used. In particular, by a molding method using an injection molding machine, it is possible to continuously obtain stable molded articles. Although the conditions for the injection molding are not particularly limited, for example, a condition of injection time: 0.5 seconds to 10 seconds, back pressure: 0.1 MPa to 10 MPa, holding pressure: 1 MPa to 50 MPa, holding pressure time: 1 second to 20 seconds, cylinder temperature: 200° C. to 340° C., and mold temperature: 20° C. to 150° C. is preferred. The cylinder temperature indicates a temperature of the part of the injection molding machine that heats and melts the molding material, and the mold temperature indicates a temperature of the mold into which the resin is injected to form a desired shape. By appropriately selecting these conditions, particularly the injection time, the injection pressure (back pressure and holding pressure), and the mold temperature, it is possible to appropriately adjust the appearance of the resin crash pad, sink marks and warpage.

Joining

[0059] When an external impact is inputted, because the resin crash pad is stressed to be pressed in the direction of the metal beam, a strong joint is not required. In the range of normal use, the crash pad may be joined within the range where it does not fall off from the metal beam.

[0060] As the joining method, an adhesive, bolt fastening, a method of inserting a metal beam into the mold and overmolding the crash pad and the like can be employed. Moreover, it is also possible to join them after chemically or physically treating the surface of the metal beam.

Examples

[0061] By showing Examples hereinafter, our structures will be explained in more detail, but this disclosure is not limited to the description of these examples. First, the materials used in these examples and methods of evaluating various properties will be explained.

Analysis Software and Constraint Conditions

[0062] Analysis software: LS-DYNA version R10.1 supplied by Livermore Software Technology Corporation

[0063] Constraint conditions: As shown in FIG. 3, a structure (structure 1) comprising the metal beam 2 and the resin crash pad 3 was supported by two fulcrums 21 and 22, and set to be movable in the X and Y directions, and to be positionally fixed in the Z direction. The collision of the pole 23 was added as an external impact input, and the pole intrusion amount (distance) and the energy absorption amount of the structure at that time were analysed.

[0064] FIGS. 4(A) - 4(B) show examples of the analysis in the metal beam only and when a crash pad made of PC/PBT (polycarbonate resin/polybutylene terephthalate resin) are provided. In either instance, the metal beam bends due to the external impact, while the metal beam alone (FIG. 4(A)) causes a local bending, by providing the crash pad (FIG. 4(B), it is understood that the external impact energy is dispersed and transmitted over a wide range of the beam, and a local bending is suppressed.

Pole for Applying External Impact

[0065] The pole diameter is 305 mm. The initial velocity of the collision is referred to be 0 when the pole contacts the metal beam or crash pad, and therefrom, as the velocity profile is shown in FIG. 5, the horizontal axis is taken as the intrusion distance of the pole, while increasing the pole impact velocity, it is maintained as a constant velocity at 2.3 m/sec.

Metal Beam

[0066] It is made of a ultra-high tensile steel, length = 1000 mm, width = 127 mm, height: 30 mm, cross section: W shape. Thicknesses are 1.0, 1.3 and 1.5 mm. Ultimate tensile strength (UTS) = 1500 MPa, and Yield stress (YS) = 1100 MPa.

Resin Crash Pad

[0067] A honeycomb shape with a width of 125 mm, a height of 35 mm and an average thickness of 3 mm.

Resin Material

[0068] PC/PBT: alloy material of a polycarbonate resin and a polybutylene terephthalate resin, grade name “8207X01B” (supplied by Toray Industries, Inc.), tensile elongation at break = 50%, flexural modulus = 2.3 GPa.

[0069] PA66: 30% glass fiber-reinforced polyamide 66 resin, grade name “CM3001G30” (supplied by Toray Industries, Inc.), tensile elongation at break = 2.5%, flexural modulus = 9.5 GPa.

[0070] PPS resin: filler-reinforced polyphenylene sulfide resin, grade name “A310MX04” (supplied by Toray Industries, Inc.), tensile elongation at break = 0.9%, flexural modulus = 22 GPa.

[0071] Foam material: polyurethane resin foam having a tensile elongation at break of 95% and a flexural modulus of 100 MPa.

[0072] CF-SMC: thermosetting carbon fiber-reinforced sheet molding compound supplied by Toray Industries, Inc., tensile elongation at break = 0.9%, flexural modulus = 37 GPa.

Evaluation of Tensile Elongation

[0073] For PC/PBT, PA66 and PPS resin, using ISO test pieces prepared by injection molding, based on ISO527-1 (2012) and ISO527-2 (2012), a tensile test was performed at a strain rate of 10 mm/min in an atmosphere of a temperature of 23° C. and a humidity of 50% to measure the tensile elongation at break.

[0074] For the foam material, using an ISO test piece prepared by foam molding, based on ISO 1798 (2008), a tensile test was performed at a strain rate of 10 mm/min in an atmosphere of a temperature of 23° C. and a humidity of 50% to measure the tensile elongation at break.

[0075] For CF-SMC, using a test piece prepared by press molding, based on ISO527-1 (2012) and ISO527-4 (1997), a tensile test was performed at a strain rate of 2 mm/min in an atmosphere of a temperature of 23° C. and a humidity of 50% to measure the tensile elongation at break.

Evaluation of Flexural Modulus

[0076] For PC/PBT, PA66 and PPS resin, using ISO test pieces prepared by injection molding, based on ISO 178 (2010), a bending test was performed at a strain rate of 2 mm/min in an atmosphere of a temperature of 23° C. and a humidity of 50% to measure the flexural modulus.

[0077] For the foam material, using an ISO test piece prepared by foam molding, based on ISO 178 (2010), a bending test was performed at a strain rate of 2 mm/min in an atmosphere of a temperature of 23° C. and a humidity of 50% to measure the flexural modulus.

[0078] For CF-SMC, using an ISO test piece prepared by press molding, based on ISO 14125 (1998), a bending test was performed at a strain rate of 2 mm/min in an atmosphere of a temperature of 23° C. and a humidity of 50% to measure the flexural modulus.

Comparative Examples 1, 2, 3

[0079] Table 1 shows the weights and the energy absorption amounts analysed for single steel beams with thicknesses of 1.0, 1.3 and 1.5 mm. As the thickness increases, the weight and the energy absorption amount increase. At that time, increase in energy absorption amount per increase in weight ΔEA.sub.s/ΔW.sub.s is 1.0 for both 1.3 mm thickness and 1.5 mm thickness, based on that for 1 mm thickness.

Examples 1 and 2

[0080] The weight and energy absorption amount were analysed when a PC/PBT crash pad was provided on the impact side of a steel beam having a thickness of 1.0 mm (Table 2). At that time, increase in energy absorption amount per increase in weight ΔEA.sub.H/ΔW.sub.H was 2.2 at ¼ of the crash pad length and 2.9 at ⅛ of the crash pad length, based on Comparative Example 1 of steel only having the same thickness, and any one of them is high as compared to the steel only. Examples 3, 4, 10

[0081] The weight and energy absorption amount were analysed when a PC/PBT crash pad was provided on the impact side of a steel beam having a thickness of 1.3 mm (Table 3). At that time, increase in energy absorption amount per increase in weight ΔEA.sub.H/ΔW.sub.H was 2.6 at ¼ of the crash pad length, 4.6 at ⅛ of the crash pad length, and 2.1 at 1/16 of the crash pad length, based on Comparative Example 2 of steel only having the same thickness, and any one of them is high as compared to the steel only.

Examples 5, 6, 7, 12

[0082] The weight and energy absorption amount were analysed when a PC/PBT crash pad was provided on the impact side of a steel beam having a thickness of 1.5 mm (Table 4). At that time, increase in energy absorption amount per increase in weight ΔEA.sub.H/ΔW.sub.H was 1.3 at ½ of the crash pad length, 2.7 at ¼ of the crash pad length, 4.8 at ⅛ of the crash pad length, and 2.2 at 1/16 of the crash pad length, based on Comparative Example 3 of steel only having the same thickness, and any one of them is high as compared to the steel only.

Example 8

[0083] The weight and energy absorption amount were analysed when a PA66 crash pad was provided on the impact side of a steel beam having a thickness of 1.5 mm (Table 4). At that time, increase in energy absorption amount per increase in weight ΔEA.sub.H/ΔW.sub.H was 2.5 at ¼ of the crash pad length, based on Comparative Example 3 of the steel only having the same thickness, and it is high as compared to the steel only.

Example 9

[0084] The weight and energy absorption amount were analysed when a PC/PBT crash pad was provided on the impact side of a steel beam having a thickness of 1.5 mm without being joined to the metal beam (Table 4). At that time, increase in energy absorption amount per increase in weight ΔEA.sub.H/ΔW.sub.H was 2.6 at ¼ of the crash pad length, based on Comparative Example 3 of the steel only having the same thickness, and it is high as compared to the steel only.

Example 11

[0085] The weight and energy absorption amount were analysed when a crash pad made of PPS resin A310MX04 supplied by Toray Industries, Inc. was provided on the impact side of a steel beam having a thickness of 1.5 mm (Table 4). At that time, increase in energy absorption amount per increase in weight ΔEA.sub.H/ΔW.sub.H was 1.0 at ¼ of the crash pad length, based on Comparative Example 3 of the steel only having the same thickness, and it is equivalent to that of the steel.

Reference Example 1

[0086] As a result of analysing the weight and energy absorption amount when a urethane foam crash pad was provided on the impact side of a steel beam having a thickness of 1.5 mm (Table 4), improvement in the energy absorption amount due to the crash pad was not shown. Reference Example 2

[0087] The weight and energy absorption amount were analysed when a CF-SMC crash pad was provided on the impact side of a steel beam having a thickness of 1.5 mm (Table 4). At that time, increase in energy absorption amount per increase in weight ΔEA.sub.H/ΔW.sub.H was 0.9 at ¼ of the crash pad length, based on Comparative Example 3 of the steel only having the same thickness, and it is low as compared to the steel only.

Comparative Example 4

[0088] As a result of analysing the weight and energy absorption amount when a PC/PBT crash pad was provided on the opposite impact side of a steel beam having a thickness of 1.5 mm (Table 4), improvement in the energy absorption amount due to the crash pad was not shown.

TABLE-US-00002 Metal beam only Thickness of steel (mm) crash pad Length of crash pad Position of crash pad Energy absorption amount (J) Increase in energy absorption amount ΔEA.sub.S Weight (g) Increase in weight ΔW.sub.S ΔEA.sub.S/ ΔW.sub.S Comparative Example 1 1.0 none – – 901 – 1561 – – Comparative Example 2 1.3 none – – 1,374 472 2030 469 1.0 Comparative Example 3 1.5 none – – 1,707 806 2342 781 1.0

TABLE-US-00003 Metal beam + Resin crash pad (Metal thickness = 1.0 mm Thickness of steel (mm) crash pad Length of crash pad Position of crash pad Energy absorption amount (J) Increase in energy absorption amount AEA.sub.H Weight (g) Increase in weight ΔW.sub.H ΔEA.sub.H/ ΔW.sub.H Comparative Example 1 1.0 none – – 901 – 1561 – – Example 1 1.0 PC/PBT ¼ impact side 1,540 638 1849 288 2.2 Example 2 1.0 PC/PBT ⅛ impact side 1,366 465 1720 159 2.9

TABLE-US-00004 Metal beam +Resin crash pad (Metal thickness = 1.3 mm Thickness of steel (mm) crash pad Length of crash pad Position of crash pad Energy absorption amount (J) Increase in energy absorption amount AEA.sub.H Weight (g) Increase in weight ΔW.sub.H ΔEA.sub.H/ ΔW.sub.H Comparative Example 2 1.3 none – – 1,374 – 2030 – – Example 3 1.3 PC/PBT ¼ impact side 2,122 749 2318 288 2.6 Example 4 1.3 PC/PBT ⅛ impact side 2,110 737 2189 159 4.6 Example 10 1.3 PC/PBT 1/16 impact side 1,547 173 2114 84 2.1

TABLE-US-00005 Metal beam +Resin crash pad (Metal thickness = 1.5 mm Thickness of steel (mm) crash pad Length of crash pad Position of crash pad Energy absorption amount (J) Increase in energy absorption amount AEA.sub.H Weight (g) Increase in weight ΔW.sub.H ΔEA.sub.H/ ΔW.sub.H Comparative Example 3 1.5 none - - 1,707 – 2342 – – Example 5 1.5 PC/PBT ½ impact side 2,458 751 2908 566 1.3 Example 6 1.5 PC/PBT ¼ impact side 2,487 780 2630 288 2.7 Example 7 1.5 PC/PBT ⅛ impact side 2,466 759 2501 159 4.8 Example 8 1.5 PA6 GF30% ¼ impact side 2,523 816 2663 321 2.5 Example 9 1.5 PC/PBT ¼ impact side (not joined) 2,443 736 2630 288 2.6 Reference Example 1 1.5 Foam ¼ impact side 1,707 1,707 2351 2,351 0.7 Reference Example 2 1.5 CF-SMC ¼ impact side 2,014 2,014 2682 2,682 0.8 Comparative Example 4 1.5 PC/PBT ¼ opposite impact side 1,707 0 2583 241 0.0 Example 11 1.5 PPS MD60% ¼ impact side 2,304 597 2750 408 1.5 Example 12 1.5 PC/PBT 1/16 impact side 1,893 186 2427 85 2.2

[0089] Thus, by providing a predetermined resin crash pad at the site specified for the metal beam, a high impact energy absorption performance was obtained while suppressing a weight increase.

INDUSTRIAL APPLICABILITY

[0090] Our impact absorbing structures can be applied to any part of a vehicle such as front and rear parts and side parts where impact absorption is required, and is particularly suitable for being installed inside the side door of the vehicle.