【摘要】 采用落锤及空气动力枪作为加载装置对铜、铝及钢质圆管进行了轴向冲击实验,得到了丰富的屈曲模态及冲击力时程曲线,并从应力波的角度定性地讨论了材料特性对圆柱壳出现塑性动力屈曲或渐进屈曲的影响,指出了高速撞击不是产生动力塑性屈曲的充要条件,对某些韧性材料撞击速度不很高时也能出现动力塑性屈曲。动力塑性屈曲和动力渐进屈曲形成条件应该是:前者仅仅是在一个持续的轴向塑性流动内能够产生,后者是塑性应变局部化的结果。更多还原

【Abstract】 The experimental investigation on dynamic buckling of copper,aluminum and steel cylindrical shell under axial impact were carried out using Hopkinson bar and Drop hammer as the loading apparatus.Multiple buckling models are observed and the time histories of impact force were recorded.The theory of the stress wave is used to explain the effect of material parameter of the shell on the different buckling phenomena.The initial dynamic plastic buckling pattern forms within a sustained axial plastic flow while the localization of plastic strain results the dynamic progressive buckling.更多还原