On Size Effects in Plane Stress Crack-Growth Resistance,
HARVARD UNIV CAMBRIDGE MA DIV OF APPLIED SCIENCES
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For a ductile material, the tearing resistance curve represented by the dependence of the fracture parameter J on crack extension deltaa is a material property only for the small-scale yielding conditions that are approached for very large specimen size. In this paper the influence of size on crack-growth resistance is studied theoretically for single-edge-notch SEN specimens of ideally-plastic materials in plane stress. The calculations are based on the Dugdale model in conjunction with a crack-growth criterion defined by and invariant crack-opening shape. Over a large range of specimen sizes, results are exhibited for materials having low-to-moderate values of initial tearing resistance.