A combined numerical/experimental study of ductile crack growth after a large unloading, using T*, J and CTOA criteria

F. W. Brust, J. J. McGowan, S. N. Atluri

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59 Scopus citations

Abstract

The J-integral is commonly used to determine the resistance of plastically deformed structures to continued crack growth. This approach is only valid for monotonic loading and small crack growth; yet it is believed conservative for all general loadings. Another parameter, T*, has been formulated, which is theoretically valid under a wide range of conditions. These two plastic fracture criteria, along with CTOA (crack tip opening angle), were examined after a cycle of loading/unloading to zero load followed by reloading. The results of the numerical/ experimental study showed that the T* parameter accurately predicted the behavior (crack growth after 50% reloading), while the other parameters (J and CTOA) were seriously anticonservative.

Original languageEnglish
Pages (from-to)537-550
Number of pages14
JournalEngineering Fracture Mechanics
Volume23
Issue number3
DOIs
StatePublished - 1986

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