Atomistic simulations of shock induced microstructural evolution and spallation in single crystal nickel
Atomistic simulations of shock induced microstructural evolution and spallation in single crystal nickel
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DOI：
10.1063/1.2423084
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发表时间：
2007-02-15
影响因子：
3.2
通讯作者：
Wagner, G. J.
中科院分区：
文献类型：
--
作者：
Srinivasan, S. G.;Baskes, M. I.;Wagner, G. J.
采用分子动力学模拟方法研究了单晶镍中的Spectrophotin。冲击波-入射波、从样品自由表面反射的波以及反射波之间的干涉-产生并破坏许多微观结构特征。这些特征虽然在决定层裂强度方面不重要，但控制着层裂成核位置。在样品的冷的、有缺陷的、拉伸区域中，在晶界接合处通过空化发生剥落。原子的计算和实验，虽然在应变率上相隔六个数量级，但遵循普遍的应变率行为。
Spallation in single crystalline nickel was studied using molecular dynamics simulations. The shock waves-incident waves, the waves reflected from sample free surfaces, and interference between reflected waves-create and destroy many microstructural features. These features, though unimportant in determining the spall strength, control the spall nucleation site. Spall occurs by cavitation at a grain boundary junction in cold, defective, tensile regions of the sample. Atomistic calculations and experiments, though separated by six orders of magnitude in strain rates, follow a universal strain rate behavior.