泡沫铝填充薄壁圆管吸能特性优化

Optimization on energy absorption performance of thin-walled pipe filled with aluminum foam

为获得最大比吸能(Specific Energy Absorption,SEA)的泡沫铝填充薄壁圆管结构,以动态显式有限元分析为基础,结合响应面法(Response Surface Method,RSM),建立结构的SEA优化函数;利用MSCDytran进行碰撞仿真,得出薄壁构件的SEA随构件薄壁厚度和截面直径变化的规律;以最大SEA为优化函数,对泡沫铝填充薄壁圆管的直径和壁厚进行优化.轨道列车吸能装置的实际应用表明,该方法在降低吸能装置质量且优化模型不超出原模型最大压缩力的条件下,可以提高结构的变形能和SEA.

Based on dynamic explicit finite element algorithm and Response Surface Method（RSM）, the optimization function of Specific Energy Absorption （SEA） is established to get the thin-walled pipe filled with aluminum foam with the maximum SEA; the variation of SEA with respect to the thickness and section diameter of the thin-walled pipe is obtained through the crash simulation by using MSC Dytran ; and the thickness and diameter of the thin-walled pipe filled with aluminum foam are optimized by taking the maximum SEA as the optimization function. The practical application in the energy-absorbing device of railway vehicle shows that the method can improve the structure deformation energy and SEA under the conditions that the mass of energy-absorbing devices is reduced and the maximum compression force of the optimized model is less than the one of the original model.