文献类型：期刊文献

英文题名：Cyclic hardening/softening behavior of 316L stainless steel at elevated temperature including strain-rate and strain-range dependence: Experimental and damage-coupled constitutive modeling

作者：Xie, Xue-fang[1];Jiang, Wenchun[1,2];Chen, Jingkai[1];Zhang, Xiancheng[3];Tu, Shan-Tung[3]

机构：[1]China Univ Petr East China, Coll Chem Engn, State Key Lab Heavy Oil Proc, Qingdao 266580, Peoples R China;[2]China Univ Petr East China, Sch Petr Engn, Key Lab Unconvent Oil & Gas Dev, Qingdao 266580, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

年份：2019

卷号：114

起止页码：196

外文期刊名：INTERNATIONAL JOURNAL OF PLASTICITY

收录：;EI(收录号：20185006247938);WOS:【SCI-EXPANDED(收录号:WOS:000460718900012)】；

基金：The authors gratefully acknowledge the support provided by National Natural Science Foundation of China (51575531), Chang Jiang Scholars Program, Taishan Scholar Construction Funding (ts201511018) and National Key R&D Program of China (2018YFC0808800).

语种：英文

外文关键词：316L stainless steel; Elevated temperature; Cyclic hardening/softening; Damage-coupled cyclic constitutive model

摘要：In this study, the cyclic mechanical characters of 316L stainless steel at elevated temperature are extensively investigated by the experimental and cyclic constitutive models. The experiments include the monotonic tensile tests with different loading rates and the low cycle fatigue tests considering the effect of strain amplitudes, strain rates and loading sequences. The evolution of cyclic stress amplitudes, hysteresis loops and elastic modulus under various loading conditions are comprehensively analyzed. The experimental results show that the 316L steel at elevated temperature performs a typical three-stage cyclic mechanical response, i.e., initial hardening, subsequent saturation and final accelerated softening. The cyclic softening in both stiffness and flow stress is mainly caused by the nucleation of micro-voids or micro-cracks, and the subsequent coalesce and propagation. Furthermore, although the nearly rate-independent mechanical behavior is observed at monotonic tensile and first several fatigue cycles due to the DSA effect, the cyclic hardening/softening behavior shows a significant strain-rate and loading history dependence. Finally, inspired by the experimental observations and analyses, a damage-coupled cyclic elastic-viscoplastic constitutive model involving strain-range, strain-rate and loading history dependence is proposed to predict the complex cyclic behaviors of the material at elevated temperature. A hardening factor is incorporated into the Chaboche kinematic hardening equations to model the kinematic-induced hardening behavior. And the plastic strain memory surface and the maximum plastic strain rate are introduced to model the strain-range, strain-rate and loading history dependence of cyclic behavior. The proposed model is proved to effectively describe the complex evolution of not only cyclic stress amplitude but also hysteresis loops for the 316L steel at elevated temperature.