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Distortional strain energy density criterion: the Y-Criterion

✍ Scribed by Nabil A.B. Yehia

Publisher: Elsevier Science
Year: 1991
Tongue: English
Weight: 582 KB
Volume: 39
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(91)90060-e

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✦ Synopsis

The complete formulation of the distortional strain energy density criterion is presented. The criterion minimizes the distortional strain energy density component to predict the propagation direction. It further postulates that propagation will commence when this minimum reaches the material critical distortional strain energy density determined through the implementation of the proper yield condition. The criterion defines the crack tip core region as the distance determined m pure mode I; this distance is considered an intrinsic material property. LEFM concepts are used through the singular elastic stress field at a crack tip. Predictions of the presented fracture criterion regarding crack propagation angle and fracture load are compared to the predictions of other criteria as well as the available experimental data.

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