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Elastic-plastic behavior of a cracked structure subjected to cyclic loading is evaluated through a series of finite element analyses of a test specimen geometry. A specimen of an extremely ductile material (Type 304 stainless steel) is loaded to just below the Ji value at crack initiation, then unloaded and reloaded using R-ratios of 0.0, -0.5, and - 1.0 including the effects of crack face contact. The crack-tip asymptotic fields, tensile and compressive plastic zones, and crack-tip parameters such as crack-tip-opening displacement and the J- and T*-integrals are evaluated and discussed in the context of cyclic loading for a stationary crack.
elastic-plastic behavior, cyclic loading, crack closure, J, -integral, T, *, -integral, asymptotic fields, crack initiation, fracture mechanics, fatigue (materials)
Senior research scientist, Battelle Memorial Institute, Columbus, OH
Director of research, Ad Tech Systems Research, Dayton, OH
Graduate student, The Ohio State University, Columbus, OH