Abstract
The J integral evaluation is carried out for the surface cracks of a pressure vessel under thermal transient loadings. First a semi-elliptical surface crack existing on the inner surface of the vessel shell is treated and the effect of the aspect ratio of the crack on the J integral distribution along the crack front is studied. It is shown that the J integral value becomes nearly equal for a shallow crack when considering the thermal loading. Then the effect of cladding is studied by analyzing the surface crack existing on the nozzle surface through the phase boundary between the base metal and the cladding. The result show that the J value becomes smaller if the existence of the cladding is assumed rather than neglected.
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