This paper investigated the applicability of the differential function of J-integral Resistance (J-R) curves, that is, dJ/da to predict the leak/rupture limit on X65 and X80 line pipes. The leak/rupture limit depended on the J-R curves of line pipes and was estimable using the dJ/da approach irrespective of the levels of the Charpy impact energy. It is noted that the dJ/da approach enables us to evaluate the leak/rupture limit of pipelines having a high Charpy impact energy, to which the Charpy impact energy-based equation is inapplicable.

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