A dynamic discrete dislocation plasticity study of elastodynamic shielding of stationary cracks

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Imperial College London

Abstract

Employing Dynamic Discrete Dislocation Plasticity (D3P), an elastodynamic analysis of the shielding of a stationary crack tip by dislocations is studied. Dislocations are generated via Frank–Read sources, and make a negligible contribution to the shielding of the crack tip, whereas dislocations generated at the crack tip via homogeneous nucleation dominate the shielding. Their effect is found to be highly localised around the crack, leading to a magnification of the shielding when compared to time-independent, elastostatic predictions. The resulting attenuation of KI(t) is computed, and is found to be directly proportional to the applied load and to √t.

Details

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalJournal of the Mechanics and Physics of Solids
Volume98
Early online date13 Sep 2016
Publication statusPublished - 1 Jan 2017