Development of constitutive models for fast breeder reactor design; Multi-linear kinematic hardening model with stress reversal-on resetting

Iwata, Koji; Tsukimori, Kazuyuki; Kawasaki, Nobuchika ; Yada, Hiroki ; Kasahara, Naoto

A multilinear kinematic hardening model with stress reversal-on resetting is proposed as an idealized nonlinear elastic-plastic model which can represent material behavior more realistically than conventional models such as elastic perfectly plastic model, or bilinear elastic plastic model. The results of analyses for a uniaxial cyclic material behavior test and a two-bar thermal ratcheting test suggested the possibility that this model could be used in structural design of fast breeder reactors to predict thermal ratchet strain conservatively.