摘要
针对均质自由梁坠撞时局部发生较大的弹塑性变形而引起的材料非线性，提出了自由梁坠撞过程的力学模型，利用弹塑性有限元法模拟出了碰撞部位的非线性弹簧的力学特性曲线，求出了坠撞响应并可将此法推广应用于多体系统的坠落碰撞问题求解。
In the light of material's non-linear caused by plastoelastic deformation during free beams crashing against the ground, put forward a mechanics model of free beams crashing. By use of the plastoelastic method of finite element, simulate the mechanics curve of non-linear spring on the impact and obtain the crashing response, which can be used to solve impact problems occurred in the multi-body system crashing.
