Abstract
A plate containing a semi-elliptical surface crack is selected as a typical surface crack case to investigate the effects of the bending stress parallel to the crack plane on the limit load and elastic-plastic J. Elastic and elastic-plastic FE analyses are used to obtain J values for the surface-cracked plate under stress normal to the crack plane or under biaxial stress plus through-thickness bending with/without bending stress parallel to the crack plane. The results show that the applied bending stress parallel to the crack plane does not affect the elastic J, and, therefore, the stress intensity factor (SIF), but it does affect the elastic-plastic J. A reference stress estimation method considering the bending stress parallel to the crack plane is developed, which shows good correlation to the elastic-plastic J for cases with/without the bending stress parallel to the crack plane. This method is then used to extend the developed local limit load model to include the effect of the bending stress parallel to the crack plane.
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