| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy automobile body reinforcing material such as a bumper reinforcing material and a door guarding bar, having a high bending strength against the bending load at the time of collision of the body and a high energy absorbing characteristic as bending collapse characteristics, excellent in the safety against the collision by itself without attaching an additional reinforcing material. SOLUTION: The automobile body reinforcing material 20 is made of an aluminum alloy hollow-extrusion having an approximately rectangular cross section. The automobile body reinforcing material 20 is excellent in the bending collapse characteristics because of the following structures a-d. (a) The cross section is approximately B-shaped consisting of a front wall 1, a rear wall 2, upper and lower side walls 3 and an intermediate wall 5. (b) The thicknesses of the front wall 1 and the rear wall 2 are at least 3 mm respectively. (c) The front wall 1 and the rear wall 2 are divided by the respective side walls 3 and 4, and flange parts 6-9 are disposed at ends of the front wall 1 and the rear wall 2. (d) A front wall side end 5a of the intermediate wall 5 is connected to a front wall center part 1e in such a way that the wall width of the front wall 1 is reduced, and a recess 10a is formed in the front wall center part 1e. COPYRIGHT: (C)2009,JPO&INPIT
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