文献类型：期刊文献

中文题名：焊接接头延性裂纹扩展的数值模拟

英文题名：Numerical simulation of ductile crack propagation in weld joint

作者：孙慧敏[1];王国珍[1];轩福贞[1];刘长军[1]

机构：[1]华东理工大学承压系统安全科学教育部重点实验室,上海200237

年份：2010

卷号：31

期号：8

起止页码：105

中文期刊名：焊接学报

外文期刊名：Transactions of The China Welding Institution

收录：CSTPCD;;EI(收录号：20104113293373);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家高技术研究发展计划基金资助项目(2009AA04Z409;2009AA04Z421)

语种：中文

中文关键词：裂纹扩展;焊接接头;损伤模型;阻力曲线

外文关键词：crack propagation; weld joint; damage model; resistance curve

摘要：用GTN损伤模型对30Cr2Ni4MoV转子钢焊接接头延性裂纹的扩展进行了有限元模拟.模拟得到的焊缝、母材和热影响区断裂韧性试样的载荷—位移曲线和J-△a阻力曲线与试验曲线吻合良好,以此确定了GTN模型中的材料损伤参数.结果表明,焊缝的裂纹扩展阻力最低,热影响区最高,母材居中;当初始裂纹位于母材和热影响区界面时,裂纹偏向强度和扩展阻力较低的母材一侧扩展,其阻力曲线和母材相似;当初始裂纹位于热影响区和焊缝界面时,裂纹向焊缝一侧偏离且沿着界面扩展,阻力曲线较焊缝稍有降低.
The ductile crack propagation in the welded joint of turbine rotor steel is simulated by using the finite element method (FEM) with the GTN model, and the curve of loading-displacement and the J-△a crack resistance curves of fracture toughness for base metal (BM), heat-affected zone (HAZ) and weld are simulated by using the GTN model, which fit well with the experiment. The results show that the weld has lowest crack propagation resistance, and the HAZ has the highest resistance. When the initial crack is located at the interface between the BM and HAZ, the crack tends to propagate towards the BM side with lower strength and growth resistance, and its resistance curve is similar to the BM. When the initial crack is located at the interface between the HAZ and weld, the crack growth path deviates from the interface and propagates along the interface, and the resistance curve of interface crack propagation is slightly lower than that of the weld.