中文摘要：

基于显式有限元技术，采用响应面法，以结构的比吸能为优化函数，以提高吸能原件的抗撞性为目的，研究正方形截面金属薄壁构件的长度对抗撞性的影响；经过数值分析，得出正方形截面薄壁构件的比吸能关于构件长度和截面边长的变化规律，这些规律可以用于实际吸能原件的设计，并为进一步研究奠定基础。

英文摘要：

The influence of length of the metal thin-walled component with a square cross-section on the crashworthiness is studied, where the specific energy absorption （SEA） is taken as the objective function by using the response surface method （RSM） on a basis of the explicit finite element （FE） algorithm. The main purpose of the research is to improve the crashworthiness of the thin-walled component for energy-absorption. The response surface of SEA with respect to the totallength and sectional side length of the square cross-sectional thin-walled component is obtained through the numerical analysis. The conclusions can be thus used to the optimal design of the practical energy-absorbing element and the further study.