Abstract
The size requirement for applying the stress intensity factor K I under biaxial loading in plane strain and plane stress conditions is studied by performing a two-dimensional elastic-plastic finite element analysis. The extent to which K I is validly used is determined by comparing the energy release rate G, a linear elastic fracture mechanics parameter, with the J-integral, an elastic-plastic fracture mechanics parameter. The result shows that the minimum value of the remaining uncracked ligament and the crack length for ensuring K-controlled crack tip characteristics is (0.5∼1.0)(K I/σ ys )2, where σ ys is yield stress depending on the load biaxiality, while ASME suggests 2.5(K I/σ ys )2 for uniaxial loading.
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