柱壳在轴向冲击载荷作用下动态塑性屈曲的实验研究

Dynamic Plastic Buckling of Cylindrical Shell Under Axial Impact-An Experimental Study

圆柱壳的动态塑性屈曲问题的研究主要是集中在屈曲模态方面，至于屈曲的临介载荷与临介时间则研究的较少，ＳＨＰＢ用于研究材料在高应变率下动态力学性能已为大家所熟悉，但用于研究结构的动态屈曲则未见报道。本文利用这一装置对柱壳的动态塑性屈曲进行了实验研究，测出了壳体屈曲过程的载荷，轴向缩短量与时间的关系曲线，得到屈曲时的临介载荷与临介时间。同时发现壳体屈曲变形的一些规律，并与静态实验的结果进行了比较，为理论分析和建模提供了依据。

The research of dynamic plastic buckling of circular cylindrical shell has been mainiy concentrat-ed on bucklins mode from 1960s to now. and the investigation of buckling load and buckling time isvery little. Studying dynamic buckling of structure on SHPB system. which is widely used in meassur-ing material behavior at high strain rate. is not reported until now.Thi snow.This paper uses the SHPB systemto study dynamic plastic buckling of small size cylindrical shell under rectangular pulse loads. It mea-sures out the relation curve of load. axial shortening and time of buckling process. and gets critical de-formation process. Dynamic experimental results are compared with static results and supply basis oftheoretical modeling and analysis.