Abstract
The J-R curves determined with high constraint specimens can be overly conservative for structural integrity analyses of cracks in pipes and pressure vessels. In this investigation, J-R curves are determined experimentally with low-constraint single edge tension (SE(T)) specimens of a HSLA-steel and an Alloy 52 dissimilar metal weld (DMW) and the quality of the data is analysed. The results show that the CANMET crack length prediction gives a good fit to the measured data within the validity limits of the prediction, the stress in the remaining ligament does not exceed the true tensile strength, and the increase in the J-R curve due to loss of constraint was predicted analytically.
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