纳米泡沫金属压制动力学的分子动力学模拟研究
Compaction dynamics of metallic nano-foams: A molecular dynamics simulation study
摘要：
我们研究，分子动力学模拟，与动态压实的金属纳米泡沫在很高的应变率的一般特征。一个普遍的特点，强夯过程中揭示了两个不同的区域组成：一个不断增长的破碎区和领先的流体前体。压碎区域具有比固体材料低的密度，并且通过{ \it雪犁}随时间逐渐变厚。捕获的流体前体通过泡沫细丝的烧蚀和/或熔化以及随后将热原子限制在与泡沫的细丝长度相当的区域中而产生。定量表征了纳米泡沫的压实动力学，并讨论了压实形式的状态方程。我们认为，高能量泡沫破碎是不是一个冲击现象，即使两者共享扫雪功能。
英文摘要：
We investigate, by molecular dynamics simulation, the generic features associated with the dynamic compaction of metallic nano-foams at very high strain rates. A universal feature of the dynamic compaction process is revealed as composed of two distinct regions: a growing crushed region and a leading fluid precursor. The crushed region has a density lower than the solid material and gradually grows thicker in time by {\it snowplowing}. The trapped fluid precursor is created by ablation and/or melting of the foam filaments and the subsequent confinement of the hot atoms in a region comparable to the filament length of the foam. Quantitative characterization of nano-foam compaction dynamics is presented and the compacted form equation-of-state is discussed. We argue that high-energy foam crushing is not a shock phenomenon even though both share the snowplow feature.
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