文献类型：期刊文献

英文题名：Effect of cyclic loadings on stress relaxation behaviors of 9-12%Cr steel at high temperature

作者：Wang, Cheng[1];Xuan, Fu-Zhen[1];Zhao, Peng[1];Guo, Su-Juan[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, MOE, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2021

卷号：156

外文期刊名：MECHANICS OF MATERIALS

收录：;EI(收录号：20210709924327);WOS:【SCI-EXPANDED(收录号:WOS:000632947200002)】；

基金：The work was supported by the National Natural Science Foundation of China (Grant numbers 51835503).

语种：英文

外文关键词：Stress relaxation; Cyclic loading; Constitutive model

摘要：Stress relaxation experiments of 9-12%Cr steel were conducted under static and cyclic straining controlled fatigue. It has been found that the stress relaxation will be restrained where the cyclic strain values are fluctuated below the initial strain. By contrast, when the dynamic loading repeated around or fluctuated above the value of the initial strain, the stress relaxation becomes more severe or even relaxed completely for the strain amplitude being large enough. On the whole, the acceleration or deceleration behavior of stress relaxation depends on the mean strain and the strain amplitude. An analysis of the stress-strain loops shows that the stress relaxation is mainly due to the relaxation of back-stress. Accordingly, a micromechanical constitutive model was developed by improving the kinematic hardening rule with a modified static recovery term. As expected, stress relaxation behaviors under both the static and cyclic loading are reproduced reasonably.