Compaction dynamics of metallic nano-foams: A molecular dynamics simulation study

Details Compaction dynamics of metallic nano-foams: A molecular dynamics simulation study Compaction dynamics of metallic nano-foams: A molecular dynamics simulation study

2011-02-17

arxiv.org/abs/1102.3718v1

Physics

Condensed Matter

Materials Science

7 page, 14 figures, submitted to Phys. Rev. E

Scientific paper

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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