Ratchetting characteristics of 316FR steel at high temperature, part I: Strain-controlled ratchetting experiments and simulations

摘要

The paper is concerned with characteristics in ratchetting of 316FR steel at high temperature. In Part I, first, by discussing isothermal and nonisothermal "strain-controlled'' ratchetting experiments, it is shown that 316FR steel exhibits the almost perfect closure of stress and strain hysteresis loops as well as the isotropic hardening depending on maximum plastic strain rather than accumulated plastic strain. Second, it is demonstrated that the experiments are simulated well using the nonlinear kinematic hardening model proposed in 1993 by Ohno and Wang (Int. J. Plasticity 9, 375-403) if the model is extended by taking account of the isotropic hardening depending on maximum plastic strain. On the basis of these findings, thermal ratchetting of 316FR steel cylinders subjected to the axial variation of temperature is analyzed in Part II. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 20]