On modelling of kinematic hardening for ratcheting behaviour Original Research Article

A kinematic hardening rule is formulated on the assumption that each component αi of back stress has a critical state for its dynamic recovery to be fully activated. The rule has a feature that only the projection of plastic strain rate to the direction of αi contributes to the dynamic recovery. This is in contrast with previous rules in which the accumulated plastic strain rate enters into the dynamic recovery term. Applying the present and previous rules to experiments of modified 9Cr-1Mo steel at 550°C, we discuss effects of the feature mentioned above on simulating the multiaxial as well as uniaxial ratcheting behaviour.