文献类型：期刊文献

英文题名：Fracture strain model for hydrogen embrittlement based on hydrogen enhanced localized plasticity mechanism

作者：Huang, Song[1];Zhang, Yalin[1];Yang, Chao[1];Hu, Hui[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：45

期号：46

起止页码：25541

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20203008962884);WOS:【SCI-EXPANDED(收录号:WOS:000569373200001)】；

基金：This work was supported by the National Natural Science Foundation of China-Natural Science Foundation for youth scientist(Grand No. 51905173).

语种：英文

外文关键词：Hydrogen embrittlement; HELP; Fracture strain model; Void growth and coalescence; Continuum damage model

摘要：Hydrogen energy is a candidate of the "ultimate energy". However, the quantified evaluation of hydrogen embrittlement phenomenon remains to be a challenging topic. This paper provides a continuum damage model to quantify hydrogen embrittlement. Firstly, theoretical model of the proposed method was introduced. The proposed model applied multi-axial fracture strain based ductile damage evolution law coupled with HELP mechanism to evaluate hydrogen accelerated micro-void coalescence (MVC) fracture. Void growth and coalescence were described by hydrogen enhanced plastic strain and hydrogen reduced fracture strain. Then, the proposed method was implemented on commercial finite element software package. Compact tensile (CT) test and slow strain rate tensile (SSRT) test of two commercial steels were investigated numerically and compared with available experimental results to verify the rationality of the proposed model. The results indicated the proposed method reproduced CT and SSRT tests result with different hydrogen concentrations precisely. Hydrogen's effect on MVC process was discussed. It is suggested HELP based MVC could be a viable model to quantify hydrogen embrittlement. The proposed method was also highlighted with the advantage of describing hydrogen's effect with only one parameter. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.