Abstract
Abstract The paper presents the results of a theoretical investigation whose objective has been to see whether there are advantages to be gained from using the modified J-integral in procedures for estimating the critical crack length for CANDU pressure tubes. For typical operation conditions, and with irradiated tubes having critical crack lengths over a wide range, it is shown that the slope of the modified J-integral JM-Δa crack growth resistance curve for a pressure tube crack is only marginally greater than the slope of the corresponding deformation J-integral JD-Δa curve; the results are expressed in terms of the parameter Z ∗ , which is dJM/da − dJD/da and the parameter Q, which is the fractional difference between dJM/da and dJD/da. In the light of these findings, there would appear to be little advantage to be gained in using JM, rather than JD, as a characterizing parameter for crack growth in a CANDU pressure tube.
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