Abstract
Abstract— The J‐integral is an elastic‐plastic fracture mechanics parameter which can be regarded as a measure of the intensity of the crack tip stress and strain fields, irrespective of the plastic zone size. The value of J at the onset of stable crack extension, JIC, has been suggested as a fracture criterion for both large‐and small‐scale yielding conditions. In this work the value of JIC for an extruded, medium‐strength aluminium alloy, 2024‐T351 bar, was determined using; (i) the Hutchinson‐Rice‐Rosengren crack tip model and experimentally‐determined crack tip strain profiles; and (ii) the ASTM standard multiple‐specimen technique. Knowing the critical load for initial crack extension from the crack tip strain profile method also enabled JIC to be computed using a finite element‐hybrid contour method and a modified linear elastic fracture mechanics approach. Agreement between the JIC values obtained by the various methods was good.
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