2011/02/17 by M. A. Duchaineau, Mark A. Duchaineau, J. B. Elliott +11 · 1 citation
Engineering · Materials Science · Physics and Astronomy · #Block Copolymer Self-Assembly #Enhanced Oil Recovery Techniques #Pickering emulsions and particle stabilization #cond-mat.mtrl-sci #cond-mat.other
paper · pdf · doi:10.48550/arxiv.1102.3718
7 page, 14 figures, submitted to Phys. Rev. E
arxiv created 2011/02/17 · arxiv updated 2011/02/21
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.