Abstract:

Based on an analysis on the advantage of the scheme of energy absorption by material stretching, a pre?collapse tensile energy?absorbing structure is innovatively proposed, which can effectively enhance the impact energy absorption performance. Firstly, through the compression test of the energy?absorbing box and the tensile test of the standard tensile specimen, it is indicated that the energy absorption by material stretching has the advantages of higher specific energy absorption. Then, a pre?collapse tensile energy?absorbing structure is constructed, which utilizes the stretching of energy?absorbing bar to absorb energy. The characteristics of impact deformation and energy absorption of the structure are analyzed by finite element collision simulation, and an optimization is conducted on thickness parameters. The results show that the new structure takes full advantage of the principle of energy absorption by material stretching and achieves 40% higher specific energy absorption than traditional structure, enhancing its collision safety performance significantly.

Key words: energy absorption by material stretching, pre?collapse tensile energy?absorbing structure, crash simulation