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

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 leadin...

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Bibliographic Details
Published in:arXiv.org 2011-02
Main Authors: Duchaineau, M A, Elliott, J B, Hamza, A V, Dittrich, T, T Diaz de la Rubia, Abraham, Farid F
Format: Article
Language:English
Subjects:
Ablation
Crushing
Filaments
Foamed metals
Hot atoms
Molecular dynamics
Precursors
Simulation
Online Access:Get full text
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Summary: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.
ISSN:2331-8422