ARTICLE
Effect of cyclic hardening on stress relaxation in SUS316HTP under creep-fatigue loading at 700ºC: experiments and simulations
 
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1
Nagoya Industrial Science Research Institute, Nagoya
2
Department of Computational Science and Engineering, Nagoya University, Nagoya
3
IHI Corporation, Yokohama
4
Osaka University
Submission date: 2017-12-28
Acceptance date: 2018-03-01
Online publication date: 2018-04-15
Publication date: 2018-04-15
 
Journal of Theoretical and Applied Mechanics 2018;56(2):497–510
 
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ABSTRACT
Cyclic hardening and stress relaxation experiments of SUS316HTP were performed under creep-fatigue loading with tensile strain holding at 700◦C. Experiments revealed that under strain holding, the slow stress-relaxation stage satisfying Norton’s law with slight cyclic hardening followed a rapid stress-relaxation stage that was noticeably affected by cyclic hardening. This suggests that in the slow stress-relaxation stage, inelastic deformation mechanisms different from that of viscoplasticity occurred. Experiments were simulated using a cyclic viscoplastic-creep model in which the inelastic strain-rate was decomposed into viscoplastic and creep components that were affected differently by cyclic hardening. The simulation accurately reproduced the experiments.
eISSN:2543-6309
ISSN:1429-2955