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The role of the mobility law of dislocations in the plastic response of shock loaded pure metals

Published version
Peer-reviewed

Type

Article

Change log

Authors

Gurrutxaga-Lerma, B 

Abstract

This article examines the role that the choice of a dislocation mobility law has in the study of plastic relaxation at shock fronts. Five different mobility laws, two of them phenomenological fits to data, and three more based on physical models of dislocation inertia, are tested by employing dynamic discrete dislocation plasticity (D3P) simulations of a shock loaded aluminium thin foil. It is found that inertial laws invariably entail very short acceleration times for dislocations changing their kinematic state. As long as the mobility laws describe the same regime of terminal speeds, all mobility laws predict the same degree of plastic relaxation at the shock front. This is used to show that the main factor affecting plastic relaxation at the shock front is in fact the speed of dislocations.

Description

Keywords

dislocations, plasticity, mobility law, shock loading, elastic precursor decay

Journal Title

Modelling and Simulation in Materials Science and Engineering

Conference Name

Journal ISSN

0965-0393
1361-651X

Volume Title

24

Publisher

IOP Publishing
Sponsorship
The author acknowledges support by the EPSRC under the EPSRC Doctoral Prize Fellowship scheme. The author is indebted to D Dini, A P Sutton and D S Balint for their comments and useful discussions. The author reports no competing interests. This work did not involve any collection of human or animal data. This work does not have any experimental data.