【摘要】 把损伤度函数模型嵌入到二维有限元程序DEFEL中,并对3种钢(HR-2钢、2169钢及45钢)的平板撞击层裂实验进行了数值模拟,在模拟中计及材料的屈服硬化效应和Bauschinger效应的影响,较好地再现了实测自由面的速度历史,同时给出了样品中的损伤分布及其发展。在数值模拟中发现,断裂面附近所受最大拉应力介于由声学近似解析计算的层裂强度和从三项式固体状态方程出发得出的断裂理论值之间,并对三者之间的差异作了分析,表明数值模拟结果是合理的。更多还原

【Abstract】 A damage function model is implemented in 2D finite element code-DEFEL,with which the simulation of plate surface spallation testing is performed by using the material parameters of three type steel,HR-2,2169 and 45.The effect of strain-hardening and Bauschinger are taken into account.The calculated free-surface velocity-time relation curves are consistent with the experimental results.The damage distribution and its development in the spalled layers are also given from the numerical results.The spall strength of materials from simulation is higher than that from acoustical approximation,but lower than theoretical spall strength.The analysis of the differences among them shows that the simulation is reasonable.更多还原