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.
@article{arxiv.1202.4650,
title = {Compaction Dynamics Of Metallic Nano-Foams},
author = {Farid F. Abraham and M. A. Duchaineau},
journal= {arXiv preprint arXiv:1202.4650},
year = {2012}
}
Comments
arXiv admin note: substantial text overlap with arXiv:1102.3718