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Publication 14-CNA-025

Dynamics for Systems of Screw Dislocations

Timothy Blass
Department of Mathematical Sciences
Carnegie Mellon University
Pittsburgh PA 15213-3890 USA

Irene Fonseca
Department of Mathematical Sciences
Carnegie Mellon University
Pittsburgh PA 15213-3890 USA

Giovanni Leoni
Department of Mathematical Sciences
Carnegie Mellon University
Pittsburgh PA 15213-3890 USA

Marco Morandotti
Departamento de Matematica
Instituto Superior Técnico
Lisbon, Portugal

Abstract: The goal of this paper is the analytical validation of a model of Cermelli and Gurtin [12] for an evolution law for systems of screw dislocations under the assumption of antiplane shear. The motion of the dislocations is restricted to a discrete set of glide directions, which are properties of the material. The evolution law is given by a "maximal dissipation criterion", leading to a system of di_erential inclusions. Short time existence, uniqueness, cross-slip, and fine cross-slip of solutions are proved.

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