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Expansions for the linear-elastic contribution to the self-interaction force of dislocation curves

Part of: Dynamical problems Plastic materials, materials of stress-rate and internal-variable type

Published online by Cambridge University Press:  20 October 2021

PATRICK VAN MEURS Open the ORCID record for PATRICK VAN MEURS [Opens in a new window]
PATRICK VAN MEURS*
Affiliation:
Faculty of Mathematics and Physics, Kanazawa University, Kanazawa, Japan email: [email protected]
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Abstract

The self-interaction force of dislocation curves in metals depends on the local arrangement of the atoms and on the non-local interaction between dislocation curve segments. While these non-local segment–segment interactions can be accurately described by linear elasticity when the segments are further apart than the atomic scale of size $\varepsilon$ , this model breaks down and blows up when the segments are $O(\varepsilon)$ apart. To separate the non-local interactions from the local contribution, various models depending on $\varepsilon$ have been constructed to account for the non-local term. However, there are no quantitative comparisons available between these models. This paper makes such comparisons possible by expanding the self-interaction force in these models in $\varepsilon$ beyond the O(1)-term. Our derivation of these expansions relies on asymptotic analysis. The practical use of these expansions is demonstrated by developing numerical schemes for them, and by – for the first time – bounding the corresponding discretisation error.

Keywords

dislocation curvesasymptotic expansiondiscretisation error

MSC classification

Primary: 74H10: Analytic approximation of solutions (perturbation methods, asymptotic methods, series, etc.)
Secondary: 74C10: Small-strain, rate-dependent theories (including theories of viscoplasticity)
Type
Papers
Information
European Journal of Applied Mathematics , Volume 33 , Issue 6 , December 2022 , pp. 1032 - 1061
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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