Using the finite element software Abaqus, the present study utilized explicit flaw modeling techniques to compute nozzle corner crack stress intensity factors for a range of semi-elliptical and sawcut cracks in a nozzle and semi-elliptical cracks in a flat plate. Additionally, a weight function method (WFM) for a semi-elliptical crack in a flat plate was evaluated. Stress intensity factors were computed for a number of loading conditions. A transient thermal stress analysis was performed for the nozzle explicit flaw models and discussed. Results of this study indicate that stress intensity factors at the bisecting position of the elliptical crack front from the flat plate model agree well with the analogous nozzle crack bisector position results and WFM solution.

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