Assessment of low cycle fatigue crack growth under mixed-mode loading conditions by using a cohesive zone model

摘要

Most cohesive zone models were used to reproduce fatigue crack growth under small scale yielding and failed to predict elastic-plastic fatigue crack growth. In the present work a new cohesive zone model is introduced to give a uniform description of both fatigue crack growth and elastoplastic rupture. Damage accumulation of the cohesive model contains both monotonic damage as well as cyclic damage and validated by corresponding mixed-mode fracture and fatigue experiments of an austenitic stainless steel. Computations confirm that the present cohesive zone model may provide a uniform description for the whole fatigue crack growth regimes.