The effects of initial temperature on shock-induced spalling behavior and damage evolution of single-crystal Tantalum were investigated using molecular dynamics simulation. The wave profiles show that shock pressure and temperature increment rise as initial temperature increases, which can be explained utilizing the Rankine-Hugoniot relationship. It is found that strain rate and the initial temperature has a substantial effect on the spall strength. The spall strength will decrease with initial temperature increases, and the competition between the strain rate hardening and temperature softening effect on spall strength is discussed. The radial distribution function analysis reveal that the classical spallation occurs under shock velocity 1.5 km/s and micro-spalling state with material partially melted or melted happened in higher shock velocity. The simulations show that shock-induced spalling of Tantalum is characterized by void nucleation, growth, and coalescence. The void evolution characteristics in classical spallation and micro-spalling are discussed. Furthermore, it is found that the initial temperature has a dramatic effect on the void evolution. The total voids number increases as the initial temperature rises. The characteristics of the free surface velocity profile are also disscussed.

使用分子动力学模拟研究了初始温度对单晶钽的冲击引起的剥落行为和损伤演变的影响。波形显示冲击压力和温度增量随着初始温度的升高而升高，这可以利用 Rankine-Hugoniot 关系来解释。发现应变速率和初始温度对剥落强度有显着影响。剥落强度会随着初始温度的升高而降低，讨论了应变率硬化和温度软化对剥落强度的影响之间的竞争。径向分布函数分析表明，经典散裂发生在1.5 km/s的冲击速度下，材料部分熔化或熔化的微观剥落状态在更高的冲击速度下发生。模拟表明，冲击引起的钽剥落的特征是空隙成核、生长和聚结。讨论了经典剥落和微剥落中的空隙演化特征。此外，发现初始温度对空隙演化有显着影响。总空隙数随着初始温度的升高而增加。还讨论了自由表面速度剖面的特性。