Work

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

Year: 2025

Type: article

Abstract: Nonequilibrium molecular dynamics simulations of shock loaded single-crystal Al in the ⟨100⟩, ⟨110⟩, ⟨111⟩, and ⟨123⟩ 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 ⟨100⟩ and ⟨111⟩ 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.

Source: Journal of Applied Physics

DOI: 10.1063/5.0239019

Authors: Andre Archer, Kaitlyn Campbell, Douglas E. Spearot

Institution: University of Florida

Language: English

Topic: High-Velocity Impact and Material Behavior

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,500

Funder: National Nuclear Security Administration