| 摘要 |
PCT No. PCT/NO91/00034 Sec. 371 Date Aug. 31, 1992 Sec. 102(e) Date Aug. 31, 1992 PCT Filed Mar. 6, 1991 PCT Pub. No. WO91/14110 PCT Pub. Date Sep. 19, 1991.An energy absorbing structure is employed in a front or rear portion of a vehicle body. The structure is in the form of a unitary and one-piece longitudinally extending aluminum or aluminum alloy member that is extruded to have a substantially uniform cross section. The member is subjected to an aging heat treatment operation to impart a material strength to the member. Subsequently, at least one longitudinal zone of the member is subjected to an overaging heat treatment to thereby lower the material strength of such zone. As a result, by the member being subjected to longitudinally differential heat treatment, the member has material strengths differing longitudinal of the member. Upon an impact being imparted to the portion of the vehicle body, a force acting on the member will cause the zone thereof to be subjected to axial compression deformation.
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