文献类型：期刊文献

英文题名：Numerical investigation of ductile crack growth behavior in a dissimilar metal welded joint

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

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

年份：2011

卷号：241

期号：8

起止页码：3234

外文期刊名：NUCLEAR ENGINEERING AND DESIGN

收录：;EI(收录号：20113214210706);WOS:【SCI-EXPANDED(收录号:WOS:000294374600066)】；

基金：This work was financially supported by the Project of the National Natural Science Foundation of China (51075149, 50835003), and the National High Technology Research and Development Program of China (2009AA04Z409), and the Project from the Science and Technology committee of Shanghai (10521100507).

语种：英文

外文关键词：Finite element method - Welding - Fracture toughness - Strain hardening - Nuclear power plants - Dissimilar metals - Strain - Crack tips - Interfaces (materials) - Location - Nuclear fuels - Crack propagation - Yield stress

摘要：In this paper, the finite element method (FEM) based on GTN model is used to investigate the ductile crack growth behavior in single edge-notched bend (SENB) specimens of a dissimilar metal welded joint (DMWJ) composed of four materials in the primary systems of nuclear power plants. The J-Delta a resistance curves, crack growth paths and local stress-strain distributions in front of crack tips are calculated for eight initial cracks with different locations in the DMWJ and four cracks in the four homogenous materials. The results show that the initial cracks with different locations in the DMWJ have different crack growth resistances and growth paths. When the initial crack lies in the centers of the weld Alloy182 and buttering Alloy82, the crack-tip plastic and damage zones are symmetrical, and the crack grow path is nearly straight along the initial crack plane. But for the interface cracks between materials and near interface cracks, the crack-tip plastic and damage zones are asymmetric, and the crack growth path has significant deviation phenomenon. The crack growth tends to deviate into the material whose yield stress is lower between the two materials on both sides of the interface. The different initial crack locations and mismatches in yield stress and work hardening between different materials in the DMWJ affect the local stress triaxiality and plastic strain distributions in front of crack tips, and lead to different ductile crack growth resistances and growth paths. For the accurate integrity assessment for the DMWJ, the fracture toughness data and resistance curves for the initial cracks with different locations in the DMWJ need to be obtained. (C) 2011 Elsevier B.V. All rights reserved.