SEDL / STP / STP1131-EB / STP23705S

Elastic-Plastic Crack-Tip Fields Under History-Dependent Loading

Brust, FW
Senior research scientist, Battelle Memorial Institute, Columbus, OH

Ahmad, J
Director of research, Ad Tech Systems Research, Dayton, OH

Naboulsi, S
Graduate student, The Ohio State University, Columbus, OH

Pages: 19    Published: Jan 1992

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Abstract

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.