Abstract
A procedure developed within the CEGB for assessing defective components operating in the creep range is described. The procedure utilises simplified methods based on reference stress techniques to estimate three significant times: the time for failure by continuum damage mechanisms without crack extension, the time for incubation prior to crack extension, and the subsequent time for growth to a final tolerable defect size. The materials data needed to perform the calculations are also described. Application of the procedure is illustrated by application to a cylindrical pressure vessel with a fully circumferential defect. It is shown that the use of mean values of material properties in conjunction with the procedure leads to a close prediction of the experimentally observed failure time. The sensitivity of the prediction to variations in assumed material properties is also examined. Current work addressing extension of the procedure to creep-fatigue loadings is briefly discussed.
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