厚壁316LN不锈钢管焊接接头中残余应力的有限元模拟
Finite Element Modeling of Residual Stress in Welded Joint of Thick-Walled 316LN Stainless Steel Pipes
摘 要
采用有限元模拟的方法，对厚壁316LN不锈钢管焊接接头中的焊接残余应力进行研究，分析了焊道合并对模拟结果的影响，并采用X射线应力测试对模拟结果进行了验证。结果表明：在考虑钢管初始应力的条件下，模拟结果与实测结果吻合；轴向残余拉应力主要出现与盖面焊道毗邻的钢管外壁以及最后一道盖面焊道下方，其中钢管焊接在工装上、受工装拘束较大的管道一侧，拉应力数值和范围都较大；焊道合并简化对残余压应力的分布和数值影响较大，对主要分布在盖面焊道附近的残余拉应力的影响较小；选择合适的简化模型可以在保证较高计算准确度的同时缩短计算耗时，可用于大型焊接结构残余应力场的模拟。
有限元模拟
焊道合并方法
welding residual stress
finite element modeling
lumped pass method
Abstract
The welding residual stress in welded joint of thick-walled 316LN stainless steel pipes was studied by finite element modeling, and the influence of lumped pass on simulation results was analyzed. At last, simulated results were verified by X-ray diffraction stress measurement. The results show that the simulated results were corresponded with measured results if initial stress of pipes was considered. The axial residual tensile stress is found near the cosmic weld beads and located at the region that below the last weld bead. The value of tensile residual stress is higher and its distribution region is larger. The lumped pass method had a great influence on the distribution and value of residual compressive stress rather than the residual tensile stress that distributed across the cosmic welds. Reasonable lumped pass model is suitable for welding residual stress simulation of large-scale welding structure for its efficiency and reliable accuracy.
中图分类号 TG404 DOI 10.11973/jxgccl201703019
所属栏目 物理模拟与数值模拟
基金项目
收稿日期 2016/3/2
修改稿日期 2017/1/12
网络出版日期
作者单位点击查看
备注杨秦政(1991-),男,江西上饶人,硕士研究生。
引用该论文: YANG Qin-zheng,LI Xiao-yan,ZHANG Liang. Finite Element Modeling of Residual Stress in Welded Joint of Thick-Walled 316LN Stainless Steel Pipes[J]. Materials for mechancial engineering, 2017, 41(3): 93～97
杨秦政,李晓延,张亮. 厚壁316LN不锈钢管焊接接头中残余应力的有限元模拟[J]. 机械工程材料, 2017, 41(3): 93～97
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参考文献
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【2】方洪渊. 焊接结构学[M]. 北京:机械工业出版社, 2008.
【3】JANG C, CHO P, KIM M, et al. Effects of microstructure and residual stress on fatigue crack growth of stainless steel narrow gap welds[J]. Materials & Design, 2010, 31(4):1862-1870.
【4】GHOSH S, RANA V P S, KAIN V, et al. Role of residual stresses induced by industrial fabrication on stress corrosion cracking susceptibility of austenitic stainless steel[J]. Materials & Design, 2011, 32(7):3823-3831.
【5】张定铨, 张发荣. 材料中残余应力的X射线衍射分析和作用[M]. 西安:西安交通大学出版社, 1999.
【6】宋耀民, 张亦良, 王晶, 等. 天然气管道开裂的原因[J]. 机械工程材料, 2016, 40(1):88-92.
【7】MOCHIZUKI M. Control of welding residual stress for ensuring integrity against fatigue and stress-corrosion cracking[J]. Nuclear Engineering and Design, 2007, 237(2):107-123.
【8】WOO W, AN G B, KINGSTON E J, et al. Through-thickness distributions of residual stresses in two extreme heat-input thick welds:A neutron diffraction, contour method and deep hole drilling study[J]. Acta Materialia, 2013, 61(10):3564-3574.
【9】JAVADI Y, AKHLAGHI M, NAJAFABADI M A. Using finite element and ultrasonic method to evaluate welding longitudinal residual stress through the thickness in austenitic stainless steel plates[J]. Materials & Design, 2013, 45:628-642.
【10】BARSOUM Z, LUNDBÄCK A. Simplified FE welding simulation of fillet welds-3D effects on the formation residual stresses[J]. Engineering Failure Analysis, 2009, 16(7):2281-2289.
【11】FELI S, AALEAGHA M E A, FOROUTAN M, et al. Finite element simulation of welding sequences effect on residual stresses in multipass butt-welded stainless steel pipes[J]. Journal of Pressure Vessel Technology, 2011, 134(1):011209.
【12】蔡志鹏. 大型结构焊接变形数值模拟的研究与应用[D]. 北京:清华大学, 2001.
【13】TAN L, ZHANG J, ZHUANG D, et al. Influences of lumped passes on welding residual stress of a thick-walled nuclear rotor steel pipe by multipass narrow gap welding[J]. Nuclear Engineering and Design, 2014, 273:47-57.
【14】DEPRADEUX L, ROSSILLON F. A Time saving method to compute multi-pass weld residual stresses[C]//American Society of Mechanical Engineers.[S.l.]:[s.n.], 2013:V06BT06A063.
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