The focus of this work is to investigate spall fracture in polycrystalline materials under high-speed impact loading by using an atomistic-based interfacial zone model. We illustrate that for polycrystalline materials, increases in the potential energy ratio between grain boundaries and grains could cause a fracture transition from intergranular to transgranular mode. We also found out that the spall strength increases when there is a fracture transition from intergranular to transgranular. In addition, analysis of grain size, crystal lattice orientation and impact speed reveals that the spall strength increases as grain size or impact speed increases.

中文翻译：

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通过基于原子的界面区模型对多晶固体中的剥落断裂进行计算建模和模拟

这项工作的重点是通过使用基于原子的界面区模型研究在高速冲击载荷下多晶材料的剥落断裂。我们说明对于多晶材料，晶界和晶粒之间势能比的增加可能导致从晶间模式到穿晶模式的断裂转变。我们还发现，当断裂从晶间过渡到穿晶时，剥落强度会增加。此外，对晶粒尺寸、晶格取向和冲击速度的分析表明，剥落强度随着晶粒尺寸或冲击速度的增加而增加。