Numerical methodology for treating static and dynamic dislocation problems near a free surface

Siddique, Abu Bakar; Khraishi, Tariq

doi:10.1088/2399-6528/ab8ff9

Title: Numerical methodology for treating static and dynamic dislocation problems near a free surface

Journal Article · 12 May 2020 · Journal of Physics Communications

DOI: https://doi.org/10.1088/2399-6528/ab8ff9 · OSTI ID:1618156

Siddique, Abu Bakar;

Abstract Simulation of dislocation dynamics enables researchers and scientists to explore the plastic behavior of crystalline materials under loading. Analytic solutions for the stress field due to a linear dislocation segment near a free surface are case-specific, e.g. dealing with either a horizontal segment or a vertical segment, and therefore hard to implement in time-dependent dislocation dynamics simulations as different dislocation segments could be differently oriented. This article presents a generalized numerical framework to find the stress field beneath a free surface due to the presence of a dislocation segment. The framework can be expanded to non-flat surfaces. Also, three-dimensional discrete dislocation dynamics simulations are performed here, which clearly show the effect of free surfaces on the flow stress of a material.

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Sponsoring Organization:: USDOE

OSTI ID:: 1618156

Journal Information:: Journal of Physics Communications, Journal Name: Journal of Physics Communications Journal Issue: 5 Vol. 4; ISSN 2399-6528

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

References (19)

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