高g值冲击下圆柱壳缓冲数值仿真

Numerical Simulation of Cylindrical Shell Buffer Under the High g Value Impact

圆柱壳在高g值冲击下具有潜在的缓冲吸能作用,利用大型有限元分析软件LS-DYNA对圆柱壳在高g值冲击下的缓冲过程进行了数值仿真。通过仿真,发现在高g值冲击下圆柱壳能够起到较好的缓冲效果。改变壳的几何物理参数,通过比较得出:在相同初始冲击加速度下,壁厚相同时,随着圆柱壳的直径减小其缓冲效果越来越明显;直径相同时,随着圆柱壳壁厚的减小,缓冲效果越来越明显。还提取了圆柱壳在某时刻的屈曲模态,与以往研究壳在轴向冲击载荷下屈曲模态的结论基本一致。

Cylindrical shell has the potential value of suction buffer in high g shock, by using large-scale finite element analysis software ls-dyna for cylindrical shell under the cushion process of numerical simulation by the high g values impact. It found by simulation that under the high g value impact of cylindrical shell it can play a good buffer effect. When changing shell geometric physical parameters, it compares the draw, under the same initial impact acceleration, when the wall thickness is the same, along with the reducing of diameter of the cylindrical shellthe buffering effect becomes more obvious; when the diameter is the same, with the decrease of the cylindrical shell wall thickness, the buffer effect is more obvious. It also extracts the cylindrical shell buckling mode in a certain time. The conclusions are basically identical with mode of sheU under axial impact load with buckling.