冲击载荷下软钢梁早期响应的数值模拟和简化模型

冲击载荷作用下，梁的早期响应既有弹性变形也有塑性变形，两者相互耦合．有限元数值模拟的结果表明，弹性弯曲波的传播是梁早期变形的主要机制，刚塑性简化理论预言的初始阶段中梁的“移行塑性铰”实际上是不存在的．本文提出的弹性 理想塑性简化模型可以很好地模拟固支软钢梁的早期响应

NUMERICAL SIMULATION AND A SIMPLIFIED MODEL FOR THE EARLY STAGE RESPONSE OF A MILD STEEL BEAM UNDER IMPACT LOADING

There are both elastic and plastic deformation coupled in the early stage response of a beam under impact loading. The results of finite element simulation indicate that the travelling plastic hinge predicted by the rigid plastic idealisation actually does not exist. The propagation of elastic flexural waves is the dominant deformation mechaism in the early stage. In this paper, a simplified elastic perfectly plastic coupled model is proposed which gives an excellent prediction of the early stage response of a mild steel beam under transverse impact loading.