摘要
本文对一种铝合金薄扁球壳进行了动力实验研究,用45号钢的平头圆柱弹体对壳顶以不同速度进行撞击。实验结果表明壳体上所形成的塑性环随时间的增长由其中心沿壳体子午线向其外围扩展;当弹体速度低于某一极限速度时,壳体顶点的残余变形和塑性变形区半径随弹体动能的增加近似成线性增大;弹速在62m/s的邻域,壳体发生屈曲。
The quasi-static and dynamic responses of a shallow spherical shell which is made of an aluminium alloy is studied. The load exerts on the center of the shell,and the edge of the shell is fixed. Cylinders with plane ends are used as forcing bodies. In the quasi-static experiments,the local buckling load is P_(scγ)=0.7,and the penetrating load is around 180kg.The impact load is exerted by a cylinder proiectile,It is discovered that the plastic hinge circle extends out from the center of the shell along the meridian with the increase of time. The remaining displacement (deflection) of the apex of the shell and the radius of the plastic area increase linearly with kinetic energy of the bullet.When the velocity is as high as 82m/s, The shell is penetrated and has a smaller plastic area. Dynamic buckling occurs when the velocities of the bullets are about 62.0m/s.
关键词
扁球壳
壳体
冲击
屈曲
动态行为
shallow spherical shell
impact
buckling
dynamie response
