Being a crash box with a transverse cross-sectional shape of a polygon, the innovation is designed to absorb impact energy by repeated buckling of the body in the lengthwise direction, which is induced by material strength enhancement of the crash box body and structure optimization, when impact load is exerted and eventually is compacted into a shape of bellow.
The invention improves the structure and material distribution of a crash box so that the crash box will be able to take up more energy during its plastic deformation as compared with other crash boxes of the same weight. In other words, the crash box weight can be reduced if the energy required to be absorbed is unchanged.
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