Spatial description of dislocation nucleation in the shock response of single-crystal aluminum

Archer, Andre; Campbell, Kaitlyn; Spearot, Douglas E.

doi:10.1063/5.0239019

Spatial description of dislocation nucleation in the shock response of single-crystal aluminum

Journal Article · Wed Feb 26 00:00:00 EST 2025 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0239019· OSTI ID:2524582

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University of Florida, Gainesville, FL (United States); University of Florida
University of Florida, Gainesville, FL (United States)

Nonequilibrium molecular dynamics simulations of shock loaded single-crystal Al in the $$\langle$$100$$\rangle$$, $$\langle$$110$$\rangle$$, $$\langle$$111$$\rangle$$, and $$\langle$$123$$\rangle$$ orientations are conducted to study elastic and plastic shockwave formation and details associated with dislocation activity. A computer vision-based approach is implemented to capture the presence of dislocations and describe their spatial characteristics in the zone of nucleation behind the propagating shockwave. The methodology developed relies on the sequences of images extracted during shock loading that show dislocation activity within a cross section of the sample. Results reveal that the spacing between activated slip systems is orientation dependent and exhibits a modest reduction for the $$\langle$$100$$\rangle$$ and $$\langle$$111$$\rangle$$ orientations as shock pressure increases. Comparisons are made to existing theoretical models. Such relationships between shock pressure and dislocation activity, extracted from molecular dynamics simulations, can be used to inform higher length scale simulations or modeling of dislocation-based plasticity during shock.

View Accepted Manuscript (DOE)

Research Organization:: University of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0004088

OSTI ID:: 2524582

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 137; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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