屈服强度失配对异种金属焊接接头裂纹扩展的影响分析
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摘要
为了解含缺陷核电关键构件的裂纹扩展情况,以核电一回路安全端异种金属焊接接头为研究对象,建立了符合工程实际的核电焊接接头材料模型,基于XFEM分析了屈服强度失配对裂纹扩展力学场和路径的影响。结果表明:屈服强度对裂尖力学场的梯度变化影响较小;而屈服强度的高组配形式在一定范围内能够抑制裂纹的萌生,等组配形式有利于裂纹的扩展,屈服强度的增大会使裂纹启裂所需应力值增大而裂纹扩展长度减小。研究结果为异种金属焊接接头的安全性评价提供了依据。
To understand the crack propagation of key component of nuclear power,the dissimilar metal weld joint in primary circuit was chosen as the research object,and a nuclear power welded joint material model was established based on engineering practice.The effects of yield strength mismatch on the mechanical filed and path of the crack propagation were analyzed based on the XFEM in ABAQUS.Results show that the yield strength has little effect on the gradient change of the crack tip mechanical field;the yield strength overmatch can to some extent inhibit the crack initiation,while the yield strength equal match can contribute to the crack propagation.The increase of the yield strength will enhance the resistance required for crack growth and decrease the crack propagation length.The research results can provide valuable references for the safety assessment of dissimilar metal welded joints.
To understand the crack propagation of key component of nuclear power,the dissimilar metal weld joint in primary circuit was chosen as the research object,and a nuclear power welded joint material model was established based on engineering practice.The effects of yield strength mismatch on the mechanical filed and path of the crack propagation were analyzed based on the XFEM in ABAQUS.Results show that the yield strength has little effect on the gradient change of the crack tip mechanical field;the yield strength overmatch can to some extent inhibit the crack initiation,while the yield strength equal match can contribute to the crack propagation.The increase of the yield strength will enhance the resistance required for crack growth and decrease the crack propagation length.The research results can provide valuable references for the safety assessment of dissimilar metal welded joints.
引文
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[2]赵凌燕,崔英浩,薛河,等.扩展初始角对镍基合金焊接过渡区裂纹应力腐蚀行为的影响[J].中国科技论文,2016,11(16):1864-1866.ZHAO Lingyan,CUI Yinghao,XUE He.Effect of crack propagation initiation angle on the stress corrosion cracking behavior in welding transition zone of Ni-based alloy[J].China Sciencepaper,2016,11(16):1864-1866.(in Chinese)
[3]UYULGAN B,CETINEL H,AKSOY T.Effect of constraint on fracture behavior of welded 17mn4and aisi304steels[J].Journal of Mechanical Science and Technology,2011,25(9):2171-2177.
[4]王海涛,王国珍,轩福贞,等.核压力容器异种金属焊接接头延性断裂行为的数值研究[J].核动力工程,2012,33(5):36-40.WANG Haitao,WANG Guozhen,XUAN Fuzhen,et al.Numerical research of ductile crack growth behavior for dissimilar metal welded joint of nuclear pressure vessel[J].Nuclear Power Engineering,2012,33(5):36-40.(in Chinese)
[5]熊林玉,张彦华.含裂纹强度失配焊接接头弹塑性变形分析[J].中国机械工程,2012,23(6):733-738.XIONG Linyu,ZHANG Yanhua.Effect of strength mis-matching on elastic-plastic deformation behaviors of welded joints with cracks[J].China Mechanical Engineering,2012,23(6):733-738.(in Chinese)
[6]李录贤,王铁军.扩展有限元法(XFEM)及其应用[J].力学进展,2005,35(1):5-20.LI Luxian,WANG Tiejun.The extended element finite method and its applications-a review[J].Advances in Mechanics,2005,35(1):5-20.(in Chinese)
[7]卢宇.AP1000核电安全端异种金属焊接接头结构的局部断裂和力学行为[D].上海:华东理工大学,2012.LU Yu.Local fracture and mechanical behavior in a safe-end dissimilar meta welded joint in AP1000nuclear power plant[D].Shanghai:East China University of Science and Technology,2012.(in Chinese)
[8]赵凌燕,薛河,方秀荣,等.焊接力学不均匀性对316L焊缝扩展裂纹端部场的影响[J].热加工工艺,2015,44(9):181-184.ZHAO Lingyan,XUE He,FANG Xiurong,et al.Effect of welded mechanical heterogeneity on local stress and strain ahead of propagating crack tips in 316L piping welds[J].Hot Working Technology,2015,44(9):181-184.(in Chinese)
[9]ONIZAWA K,NISHIKAWA H,ITOH H.Development of probabilistic fracture mechanics analysis codes for reactor pressure vessels and piping considering welding residual stress[J].Intemational Journal of Pressure,2010,87(1):2-10.
[10]方修君,金峰,王进廷.用扩展有限元方法模拟混凝土的复合型开裂过程[J].工程力学,2007,24(S1):46-52.FANG Xiujun.JIN Feng,WANG Jinting.Simulation of mixed-mode fracture of concrete using extended finite element method[J].Engineering Mechanics,2007,24(S1):46-52.(in Chinese)
[11]杨志锋,周昌玉,代巧.基于扩展有限元法的弹塑性裂纹扩展研究[J].南京工业大学学报(自然科学版),2014,36(4):50-57.YANG Zhifeng,ZHOU Changyu,DAI Qiao.Elasticplastic crack propagation based on extended finite element method[J].Journal of Nanjing University of Technology(Natural Science Edition),2014,36(4):50-57.(in Chinese)
[12]WANG H T,WANG G Z,XUAN F Z,et al.An experimental investigation of local fracture resistance and crack growth paths in a dissimilar metal welded joint[J].Materials &Design,2013,44:179-189.