文献类型：期刊文献

英文题名：A modified kinematic hardening model considering hetero-deformation induced hardening for bimodal structure based on crystal plasticity

作者：Zhang, Yong[1];Chen, Hao[1];Jia, Yun-Fei[1];Li, Dong-Feng[2];Yuan, Guang-Jian[1];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Pressure Syst & Safety, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen 518055, Peoples R China

年份：2021

卷号：191

外文期刊名：INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES

收录：;EI(收录号：20204209358005);WOS:【SCI-EXPANDED(收录号:WOS:000608117400017)】；

基金：This work was sponsored by the National Key Research and Development Program of China (2018YFC1902404), the National Natural Science Foundation of China (51725503, 51975211), Innovation Program of Shanghai Municipal Education Commission (2019-01-07-00-02E00068), and Shanghai Rising-Star Program (20QA1402500).

语种：英文

外文关键词：Hetero-deformation induced (HDI) hardening; Bimodal structure; Back stress; Crystal plasticity

摘要：Heterogeneous structures (HS) have been reported to overcome the longstanding challenge of the trade-off between strength and ductility in metallic materials. The deformation incompatibility between the fine grains (FG) and coarse grains (CG), producing hetero-deformation induced (HDI) hardening, is the primary mechanism for superior mechanical properties of HS. In this paper, a kinematic hardening law within the framework of crystal plasticity is modified to quantify the HDI hardening of HS in which a new parameter is established to consider the strength mismatch between FG and CG. Taking bimodal structure (BS) as an example of HS, the good agreement between the experimental and numerical results show that the proposed model can successively predict the mechanical properties, including the evolution of back stress, yield strength and strain hardening of BS with various grain size distributions. Furthermore, the underlying strengthening mechanisms are revealed by switching the HDI hardening term and analyzing the partitioning of the strain and stress in different components of BS. By manipulating the grain size ratio of BS, it is found that the effect of HDI hardening is more sensitive to the size of FG than that of CG. The proposed hardening law can provide a significant guide for heterogeneous material design.