Ratchetting characteristics of 316FR steel at high temperature, part II: Analysts of thermal ratchetting induced by spatial variation of temperature

On the basis of the material characteristics discussed in Part I, thermal ratchetting of 316FR steel cylinders subjected to the axial variation of temperature is analyzed by implementing in a finite element method three kinds of models, i.e. the elastic-perfectly plastic model, the Armstrong-Frederick model, and the first version of the Ohno-Wang model. The latter two models are specified in two forms, i.e. the combined hardening form verified in Part I and the kinematic hardening form with isotropic hardening neglected. It is shown that the analysis depends greatly on the models examined while it is influenced relatively little by the neglect of isotropic hardening, and that the Ohno-Wang model, which can express the closure of stress' and strain hysteresis loops, gives good simulations to experiments in the two cases of long and short travel distances of temperature distributions. (C) 1998 Elsevier Science Ltd. All rights reserved.