CUED Publications database

The role of homogeneous nucleation in planar dynamic discrete dislocation plasticity

Gurrutxaga-Lerma, B and Balint, DS and Dini, D and Eakins, DE and Sutton, AP (2015) The role of homogeneous nucleation in planar dynamic discrete dislocation plasticity. Journal of Applied Mechanics, Transactions ASME, 82. ISSN 0021-8936

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Abstract

© 2015 by ASME. Homogeneous nucleation of dislocations is the dominant dislocation generation mechanism at strain rates above 10 < sup > 8 < /sup > s < sup > -1 < /sup > ; at those rates, homogeneous nucleation dominates the plastic relaxation of shock waves in the same way that Frank-Read sources control the onset of plastic flow at low strain rates. This article describes the implementation of homogeneous nucleation in dynamic discrete dislocation plasticity (D3P), a planar method of discrete dislocation dynamics (DDD) that offers a complete elastodynamic treatment of plasticity. The implemented methodology is put to the test by studying four materials - Al, Fe, Ni, and Mo - that are shock loaded with the same intensity and a strain rate of 10 < sup > 10 < /sup > S < sup > -1 < /sup > . It is found that, even for comparable dislocation densities, the lattice shear strength is fundamental in determining the amount of plastic relaxation a material displays when shock loaded.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:39
Last Modified: 17 Aug 2017 01:25
DOI: