A Deformation Plasticity Analysis of the Blunted Crack Tip in Plane Strain
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
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This paper presents a deformation plasticity analysis or the tip region of a blunted crack in plane strain. The power hardening material is incompressible both elastically and plastically, in order to simulate behavior of a stress freezing material above critical temperature. The study represents a full field, finite difference solution to the Mode 1 problem. Stress and displacement fields surrounding the crack tip are presented. The results of this study indicate that the maximum stress seen at the crack tip is indeed limited and is determined by the tensile properties however, the scale over which the stresses act is dependent on the loading. Comparisons are good between the forward crack tip displacement and micro-fractographic measurements of stretch zones observed in plane strain fracture toughness tests.