A three constants kinematic hardening law for simulating low cycle fatigue and ratcheting behavior of SA333 steel

摘要

Cyclic plasticity models are used for simulating low cycle fatigue (LCF) and ratcheting behavior of materials, so that expensive experimentation can be reduced. Armstrong and Frederick (AF), Chaboche, Ohno and Wang (OW) laws are few such popular models. It has been demonstrated that AF and Chaboche laws are able to simulate LCF to a large extent, whereas they over predict the accumulation of strain during ratcheting. A three constant kinematic hardening law has been developed to simulate LCF to a better extent and represent ratcheting strain accumulation accurately. The proposed law is formulated on the assumption that the constant of the linear hardening term in AF law is variable, so that the dynamic recovery term of AF law is reduced. The simulated results of LCF at different strain range and ratcheting at different mean stress match well with experiments on SA333 steel at room temperature.