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Acta Mechanica
Erschienen in: Acta Mechanica 6/2020

07.03.2020 | Original Paper

A molecular dynamics study of effects of crystal orientation, size scale, and strain rate on penetration mechanisms of monocrystalline copper subjected to impact from a nickel penetrator at very high strain rates

verfasst von: Yangqing Dou, Yucheng Liu, Bradley Huddleston, Y. Hammi, M. F. Horstemeyer

Erschienen in: Acta Mechanica | Ausgabe 6/2020

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Abstract

This paper presents a systematic computational study to investigate the effects of crystal orientation, strain rate (impact velocity), and size (thickness) on plasticity and damage behavior of copper single crystals during the penetration process at the atomistic scale. For the penetration analysis, copper single crystals with different crystal orientations and thicknesses were impacted and penetrated by a cylindrical nickel penetrator at different initial velocities. Modified embedded atom method potentials were used to develop atomistic models, and over 250 molecular dynamics simulations were performed to fully reveal the effects of influence parameters on plasticity and damage behavior of the copper single crystals. The results show that the copper single crystal with an octal slip orientation exhibits the greatest strength and penetration resistance, while the copper crystal with the single slip orientation exhibits the lowest strength and resistance. The results further show that the strength and penetration resistance of the target increase as the thickness of the copper single crystals increases. Furthermore, as the impact velocity increases, damage and fragmentation increase. Conclusions drawn from this computational study are consistent with macroscale plasticity theories of metals and reaffirm the conclusions drawn by other researchers in previous experimental studies.
Vorheriger Artikel On primitive formulation in fluid mechanics and fluid–structure interaction with constant piecewise properties in velocity–potentials of acceleration
Nächster Artikel Torsional surface wave propagation in a transversely isotropic FG substrate with piezoelectric over-layer within surface/interface theory
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Metadaten
Titel
A molecular dynamics study of effects of crystal orientation, size scale, and strain rate on penetration mechanisms of monocrystalline copper subjected to impact from a nickel penetrator at very high strain rates
verfasst von
Yangqing Dou
Yucheng Liu
Bradley Huddleston
Y. Hammi
M. F. Horstemeyer
Publikationsdatum
07.03.2020
Verlag
Springer Vienna
Erschienen in
Acta Mechanica / Ausgabe 6/2020
Print ISSN: 0001-5970
Elektronische ISSN: 1619-6937
DOI
https://doi.org/10.1007/s00707-020-02632-8

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