文献类型：期刊文献

英文题名：Local failure behavior of a dissimilar metal interface region with mechanical heterogeneity

作者：Fan, K.[1];Wang, G. Z.[1];Xuan, F. Z.[1];Tu, S. T.[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2016

卷号：59

起止页码：419

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20155101681845);WOS:【SCI-EXPANDED(收录号:WOS:000366667800034)】；

基金：This work is supported by the Projects of the National Natural Science Foundation of China (Grant Nos: 51575184, 51375165, 51325504).

语种：英文

外文关键词：Local failure behavior; Mechanical heterogeneity; Dissimilar metal interface region; Fracture resistance; Crack growth path

摘要：Failure analyses and assessments for dissimilar metal welded joints are usually conducted by simplified interface regions without considering actual mechanical heterogeneity and limited crack positions. In this work, the finite element simulations based on Gurson-Tvergaard-Needleman damage mechanics model are used to investigate local failure behavior of a dissimilar metal interface region with mechanical heterogeneity and a series of initial crack positions. The results show that the fracture resistance and crack growth paths of the cracks in different locations of the interface region are significantly affected by mechanical heterogeneity. The interactions of different local mechanical (strength and work hardening properties) mismatches and intrinsic toughness around cracks determine the distributions and evolution of plastic strain, stress triaxiality and damage ahead of crack tips, which cause larger variations in fracture resistance and crack growth paths. For accurate and reliable failure analyses and assessments for the cracks in dissimilar metal interface regions with mechanical heterogeneity, it is recommended to obtain and use local fracture resistance properties related to crack locations. (C) 2015 Elsevier Ltd. All rights reserved.