2012/02/21 by Farid F. Abraham, Abraham, Farid F., Mark A. Duchaineau +2
Chemical Engineering · Engineering · Materials Science · Physics and Astronomy · #Enhanced Oil Recovery Techniques #Polymer Foaming and Composites #Rheology and Fluid Dynamics Studies #cond-mat.mtrl-sci #physics.comp-ph
paper · pdf · doi:10.48550/arxiv.1202.4650
arXiv admin note: substantial text overlap with arXiv:1102.3718
arxiv created 2012/02/21 · arxiv updated 2012/02/22
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 "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.