Three-dimensional elastic-plastic j-integral calculations for semielliptical surface cracks in a tensile plate

G. P. Nikishkov, S. N. Atluri

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Using a finite element method, in conjunction with an equivalent domain integral approach, the elastic-plastic crack-tip J-integral is computed for semielliptical surface flaws in a plate under a remote tensile load. The computed elastic-plastic values of the J-integral are compared to the elastic ones. It is concluded that a linear elastic fracture mechanics approach can be used for semielliptical cracks of relative depth of a/t = 0.25 and aspect ratio of c/a ≦ 3, up to load levels of 0.9δy with an error of no more than 10% in the (equivalent) elastic-plastic stress intensity factor. A simple empirical equation for evaluating the elastic-plastic J-integral for surface flaws is proposed.

Original languageEnglish
Pages (from-to)81-87
Number of pages7
JournalEngineering Fracture Mechanics
Volume29
Issue number1
DOIs
StatePublished - 1988

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