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Discrete Dislocation Dynamics in Crystals

Ariza, M. P. and Ramasubramaniam, A. and Ortiz, M. (2008) Discrete Dislocation Dynamics in Crystals. In: Progress in Industrial Mathematics at ECMI 2006. Mathematics in Industry. No.12. Springer , Berlin, pp. 387-391. ISBN 978-3-540-71991-5.

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We present a study of 3D dislocation dynamics in BCC crystals based on discrete crystal elasticity. Ideas are borrowed from discrete differential calculus and algebraic geometry to construct a mechanics of discrete lattices. The notion of lattice complexes provides a convenient means of manipulating forms and fields defined over the crystal. Atomic interactions are accounted for via linearized embedded atom potentials thus allowing for the application of efficient fast Fourier transforms. Dislocations are treated within the theory as energy minimizing structures that lead to locally lattice-invariant but globally incompatible eigendeformations. The discrete nature of the theory automatically eliminates the need for core cutoffs. The quantization of slip to integer multiples of the Burgers vector along each slip system leads to a large integer optimization problem. We suggest a new method for solving this NP-hard optimization problem and the simulation of large 3D systems.

Item Type:Book Section
Related URLs:
URLURL TypeDescription ReadCube access
Ariza, M. P.0000-0003-0266-0216
Ortiz, M.0000-0001-5877-4824
Additional Information:© 2008 Springer-Verlag Berlin Heidelberg. We gratefully acknowledge the support of the Department of Energy through Caltech’s ASC Center for the Simulation of the Dynamic Response of Materials.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:Fast Fourier Transform; Slip System; Elastic Energy; Screw Dislocation; Slip Distribution
Series Name:Mathematics in Industry
Issue or Number:12
Record Number:CaltechAUTHORS:20200603-083049889
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103660
Deposited By: Tony Diaz
Deposited On:03 Jun 2020 16:04
Last Modified:16 Nov 2021 18:23

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