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In this paper, a failure criterion applicable to large strain finite element analysis results is proposed to predict the limit bending load of the wall-thinned straight pipes. The criterion, named as the “Domain Collapse Criterion”, can handle cases for both collapse and cracking. The criterion evaluates the limit load corresponding to collapse as the load when the Mises stress exceeds the true yield strength of a material for whole "volume" with the nominal wall thickness of the straight pipe. On the other hand, the criterion evaluates the limit load corresponding to cracking as the load when the volume where Mises stress exceeds the true tensile strength penetrates the wall thickness. Results showed that the proposed criterion can estimate the experimental limit moment within approximately 20% difference, regardless of the flaw aspect ratio.
Ito et al. (2011) studied this question.