Fatigue crack initiation and growth of 16MnR steel with stress ratio effects

摘要: Abstract The effects of stress ratio on the fatigue crack initiation and growth were investigated by a newly developed unified model, which is based cyclic plasticity property material multiaxial damage criterion in incremental form. elastic–plastic stress–strain field was analyzed using general-purpose finite element software (ABAQUS) with implementation robust theory. determined applying calculated responses to criterion. rates then obtained model. Six compact specimens thickness less than 3.8 mm used for testing under various ratios (−1.0, 0.05, 0.1, 0.2, 0.3 0.5). Finite results indicated that closure occurred specimen whose 0.3. combined accumulated induced plastic deformation possible contact cracked surfaces responsible growth. predicted agreed benchmark mode I experiments very well.