Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1446107 | Acta Materialia | 2013 | 9 Pages |
Abstract
The complete fields for a double-ended dislocation pile-up, or equivalently a crack, are derived for the situation where there is a gradient in applied stress. The dislocation content is smeared into a continuous, infinitesimal distribution. The effect of the gradient is to intensify the dislocation content near the pile-up tip and weaken it (or reverse it) near the center of the pile-up. For the same tip stress the thermodynamic force to propagate the pile-up/crack is less in the gradient cases. The results can be qualitatively understood in terms of superdislocation poles.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
S. Akarapu, J.P. Hirth,