Abstract
The value of the J-integral is adopted as a plastic strain intensity factor which characterizes the crack tip deformation field in a power-law hardening material. For a planar fracture specimen containing an edge crack and subjected to loading which results in mode I deformations, the lateral contraction of the specimen in the crack tip region is calculated in terms of J from the plane stress HRR asymptotic field of nonlinear fracture mechanics. The caustic curve which would be generated by reflection of incident parallel light from points of the deformed specimen surface lying well within the crack tip plastic zone is thus determined fox different values of the hardening exponent n. The value of J is found to be proportional to the maximum transverse diameter of the caustic curve to the power (3n + 2)/n.
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