Dislocation pile-ups in stress gradients revisited

Autor:	Sreekanth Akarapu, J.P. Hirth
Rok vydání:	2013
Předmět:	Dislocation creep Materials science Polymers and Plastics Metals and Alloys Mechanics Electronic Optical and Magnetic Materials Stress (mechanics) Condensed Matter::Materials Science Crystallography Distribution (mathematics) Peierls stress Ceramics and Composites Dislocation Pile
Zdroj:	Acta Materialia. 61:3621-3629
ISSN:	1359-6454
DOI:	10.1016/j.actamat.2013.02.049
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a5c2e195134535dfc7cc12e581bb72cb https://doi.org/10.1016/j.actamat.2013.02.049 Zobrazit plný text záznamu Full Text from ScienceDirect