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Analysis and modification of fracture criteria for mixed-mode crack

✍ Scribed by Xuefeng Wu; Xinming Li

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 797 KB
Volume: 34
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(89)90242-7

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✦ Synopsis

In this paper the four common-used criteria for a mixed-mode crack are analysed and modified using the first two terms of Williams' stress series. In the new criteria the singular core is substituted by a plastic zone. These modified criteria take into account the influence of the plastic zone on crack propagation by means of the radius of the zone. The modified strain energy density factor criterion (&,-theory) unifies the different criteria for crack propagation under different stress conditions. Comparison with the experimental data shows that the maximum tangential strain [(&t&J criterion gives a good prediction of initial extension angle and is suitable for a wide range of problems.

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