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Bifurcation predictions for moving cracks by theT-criterion

✍ Scribed by P. S. Theocaris; H. G. Georgiadis

Publisher: Springer Netherlands
Year: 1985
Tongue: English
Weight: 532 KB
Volume: 29
Category: Article
ISSN: 1573-2673
DOI: 10.1007/bf00125469

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✦ Synopsis

The directional instability of moving cracks was studied within the context of the maximum dilatational energy density, or T-criterion. To make bifurcation predictions according to the T-criterion theory it suffices to consider only the singular stress field. In this paper the stress field for a non-uniformly propagating crack under mode-I deformation was adopted. Predictions concerning both the critical crack velocity and the bifurcation angle was given. In this way, not only totally brittle fractures described previously by the S-criterion were correctly encountered, but also the results were extended to initially ductile materials where the T-criterion conserves its total efficiency.

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