Self-interaction of an arbitrary moving dislocation

TL;DR

This paper derives explicit formulas for the self-force on arbitrarily moving dislocations in an elastic medium, analyzing slow and near-sonic velocities, and reproduces known results for slow motions.

Contribution

It provides a comprehensive derivation of the self-force for curved dislocations with arbitrary velocities below shear wave speed, including near-sonic behavior.

Findings

Explicit expressions for self-force components are obtained.

Near-sonic limit behavior of dislocation self-force is characterized.

Effective equations of motion match known results for slow dislocations.

Abstract

The action functional for a linear elastic medium with dislocations is given. The equations of motion following from this action reproduce the Peach-K\"{o}hler and Lorentzian forces experienced by dislocations. The explicit expressions for singular and finite parts of the self-force acting on a curved dislocation are derived in the framework of linear theory of elasticity of an isotropic medium. The velocity of dislocation is assumed to be arbitrary but less than the shear wave velocity. The slow speed and near-sonic motions of a dislocation are investigated. In the near-sonic limit, the explicit expression for the leading contribution to the self-force is obtained. In the case of slowly moving dislocations, the effective equations of motion derived in the present paper reproduce the known results.