基于LS-DYNA模拟碰撞诱发的裂纹扩展

Crack Propagation Simulation Caused by Collision Based on LSDYNA Software

以限位装置这一实例为研究对象,基于LS-DYNA有限元软件,根据材料的结构特性,选择了分段线性塑性材料模型,进而模拟了运动物体与限位装置碰撞产生的裂纹扩展路径.分析了不同裂纹角度、裂纹深度、失效应变以及冲击速度等4种工况下的裂纹扩展规律.研究结果表明针对本研究的限位装置,冲击速度和裂纹角度对裂纹扩展路径影响较大,而裂纹深度和失效应变对裂纹扩展路径影响较小.

The crack propagation path was simulated based on the piecewise linear plastic material model,which was caused by the collision between moving object and caging device using LSDYNA software. Furthermore,four cases related to crack angles,crack depths,failure strains,and impact velocities were presented to analyze the crack growth laws. The results showthat impact velocities and crack angles both have a great influence on crack propagation path,while crack depths or failure strains impacts relatively less.