基于临界距离理论预测T型管节点的疲劳强度
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摘要
依据已有支管受轴向荷载的T型焊接圆管节点的实验数据,使用ANSYS进行了有限元分析,并利用临界距离理论的点法和线法,预测了构件的疲劳强度。选取第一主应力点沿其最大梯度方向作为临界距离理论的聚焦路径。研究结果表明:预测的疲劳强度与疲劳强度实测值的误差在20%以内。临界距离理论能够在实验数据不足的情况下对焊接管节点的疲劳性能提供较精确的理论预测,为工程应用提供有价值的参考。
Based on the experimental data of the T-welded round pipe joints with the axial loads on the branch pipe, the finite element analysis is carried out by using the software ANSYS. The point method(PM) and the line method(LM) in the critical distance theory are adopted to predict the fatigue strength of the pipe joints. The maximum gradient direction of the first normal stress point is selected as the focal path of the method. The results show that the difference between the calculated values of the fatigue strength by the critical distance theory and the experimental values is in the range of ±20%. With the lack of the fatigue experimental data, the critical distance theory can provide an acceptable prediction for the fatigue strength. The predicted results can be as a valuable reference for the engineering application.
Based on the experimental data of the T-welded round pipe joints with the axial loads on the branch pipe, the finite element analysis is carried out by using the software ANSYS. The point method(PM) and the line method(LM) in the critical distance theory are adopted to predict the fatigue strength of the pipe joints. The maximum gradient direction of the first normal stress point is selected as the focal path of the method. The results show that the difference between the calculated values of the fatigue strength by the critical distance theory and the experimental values is in the range of ±20%. With the lack of the fatigue experimental data, the critical distance theory can provide an acceptable prediction for the fatigue strength. The predicted results can be as a valuable reference for the engineering application.
引文
[1]刘永健,姜磊,王康宁.焊接管节点疲劳研究综述[J].建筑科学与工程学报,2017,34(5):1-20.(LIU Yong-jian,JIANG Lei,WANG Kang-ning.Review of fatigue behavior in welded tubular joints[J].Journal of Architecture and Civil Engineering,2017,34(5):1-20.(in Chinese))
[2]刘曦.含焊接缺陷构件的疲劳可靠性评定[J].焊接学报,2008,29(1):89-92,96.(LIU Xi.Fatigue reliability evaluation for welding construction containing welding defects[J].Transactions of the China Welding Institution,2008,29(1):89-92,96.(in Chinese))
[3]李小珍,任伟平,卫星,等.现代钢桥新型结构型式及其疲劳问题分析[J].钢结构,2006,21(5):50-55.(LI Xiao-zhen,REN Wei-ping,WEI Xing,et al.New structural types and fatigue problems of modern steel bridge structures[J].Steel Construction,2006,21(5):50-55.(in Chinese))
[4]ZHAO X L,Herion S,Packer J A,et al.Design guide for circular and rectangular hollow section joints under fatigue loading[M].Koln:Verlag TUV Rheinland,2001.
[5]Hobbacher A.XIII-2151r4-07/XV-1254r4-07,Recommendations for fatigue design of welded joints and components[S].Cambridge:Woodhead Publishing,2016.
[6]郑鸿志.圆管-方管焊接节点疲劳性能和设计方法研究[D].上海:同济大学,2008.(ZHENG Hong-zhi.The fatigue behavior and design method of CHS-SHS welded joints[D].Shanghai:Tongji University,2008.(in Chinese))
[7]Sonsino C M,Fricke W,deBruyne F,et al.Notch stress concepts for the fatigue assessment of welded joints:Background and applications[J].International Journal of Fatigue,2012,34(1):2-16.
[8]高仁良,陈廷国,眭骁,等.管节点疲劳裂纹扩展规律和寿命估算[J].大连理工大学学报,1995,35(2):222-226.(GAO Ren-liang,CHEN Ting-guo,SUI Xiao,et al.Fatigue crack extending pattern and estimation of fatigue life of tubular joints[J].Journal of Dalian University of Technology,1995,35(2):222-226.(in Chinese))
[9]Taylor D.The theory of critical distances:A new perspective in fracture mechanics[M].Oxford,UK:Elsevier,2007.
[10]Lanning D B,Nicholas T,Haritos G K.On the use of critical distance theories for the prediction of the high cycle fatigue limit stress in notched Ti-6Al-4V[J].International Journal of Fatigue,2004,27(1):45-57.
[11]Righiniotis T D,Imam B M,Chryssanthopoulos M K.Fatigue analysis of riveted railway bridge connections using the theory of critical distances[J].Engineering Structures,2008,30(10):2707-2715.
[12]Shahri M M,Sandstr?m R,Osikowicz W.Critical distance method to estimate the fatigue life time of friction stir welded profiles[J].International Journal of Fatigue,2011,37(4):60-68.
[13]El Haddad M H,Smith K N,Topper T H.Fatigue crack propagation of short cracks[J].Journal of Engineering Materials and Technology,1979,101(1):42-46.
[14]Bellett D,Taylor D,Marco S,et al.The fatigue behaviour of three-dimensional stress concentrations[J].International Journal of Fatigue,2005,27(3):207-221.
[15]程睿,陈阳,崔佳,等.支管在轴向荷载作用下Q460C高强钢T型圆管节点疲劳性能试验研究[J].土木工程学报,2017,50(4):57-63,124.(CHENG Rui,CHEN Yang,CUIJia,et al.Experimental study on fatigue behavior of Q460C high strength steel welded tubular T-joints under axial loading[J].China Civil Engineering Journal,2017,50(4):57-63,124.(in Chinese)).
[16]李文超.微观机制断裂理论在高强钢材料及钢结构断裂预测分析中的应用研究[D].西安:长安大学,2017.(LIWen-chao.Research on application of micro-mechanism based fracture theory in fracture prediction analysis of high-strength steel and structures[D].Xi’an:Chang’an University,2017.(in Chinese))
[17]祝磊,石永久,王元清.TX型圆管相贯节点空间作用下的极限承载力分析[J].钢结构,2004,19(2):20-24.(ZHU Lei,SHI Yong-jiu,WANG Yuan-qing.Ultimate capacity of circular tubular TX-joints under multiplanar loads[J].Steel Construction,2004,19(2):20-24.(in Chinese))
[2]刘曦.含焊接缺陷构件的疲劳可靠性评定[J].焊接学报,2008,29(1):89-92,96.(LIU Xi.Fatigue reliability evaluation for welding construction containing welding defects[J].Transactions of the China Welding Institution,2008,29(1):89-92,96.(in Chinese))
[3]李小珍,任伟平,卫星,等.现代钢桥新型结构型式及其疲劳问题分析[J].钢结构,2006,21(5):50-55.(LI Xiao-zhen,REN Wei-ping,WEI Xing,et al.New structural types and fatigue problems of modern steel bridge structures[J].Steel Construction,2006,21(5):50-55.(in Chinese))
[4]ZHAO X L,Herion S,Packer J A,et al.Design guide for circular and rectangular hollow section joints under fatigue loading[M].Koln:Verlag TUV Rheinland,2001.
[5]Hobbacher A.XIII-2151r4-07/XV-1254r4-07,Recommendations for fatigue design of welded joints and components[S].Cambridge:Woodhead Publishing,2016.
[6]郑鸿志.圆管-方管焊接节点疲劳性能和设计方法研究[D].上海:同济大学,2008.(ZHENG Hong-zhi.The fatigue behavior and design method of CHS-SHS welded joints[D].Shanghai:Tongji University,2008.(in Chinese))
[7]Sonsino C M,Fricke W,deBruyne F,et al.Notch stress concepts for the fatigue assessment of welded joints:Background and applications[J].International Journal of Fatigue,2012,34(1):2-16.
[8]高仁良,陈廷国,眭骁,等.管节点疲劳裂纹扩展规律和寿命估算[J].大连理工大学学报,1995,35(2):222-226.(GAO Ren-liang,CHEN Ting-guo,SUI Xiao,et al.Fatigue crack extending pattern and estimation of fatigue life of tubular joints[J].Journal of Dalian University of Technology,1995,35(2):222-226.(in Chinese))
[9]Taylor D.The theory of critical distances:A new perspective in fracture mechanics[M].Oxford,UK:Elsevier,2007.
[10]Lanning D B,Nicholas T,Haritos G K.On the use of critical distance theories for the prediction of the high cycle fatigue limit stress in notched Ti-6Al-4V[J].International Journal of Fatigue,2004,27(1):45-57.
[11]Righiniotis T D,Imam B M,Chryssanthopoulos M K.Fatigue analysis of riveted railway bridge connections using the theory of critical distances[J].Engineering Structures,2008,30(10):2707-2715.
[12]Shahri M M,Sandstr?m R,Osikowicz W.Critical distance method to estimate the fatigue life time of friction stir welded profiles[J].International Journal of Fatigue,2011,37(4):60-68.
[13]El Haddad M H,Smith K N,Topper T H.Fatigue crack propagation of short cracks[J].Journal of Engineering Materials and Technology,1979,101(1):42-46.
[14]Bellett D,Taylor D,Marco S,et al.The fatigue behaviour of three-dimensional stress concentrations[J].International Journal of Fatigue,2005,27(3):207-221.
[15]程睿,陈阳,崔佳,等.支管在轴向荷载作用下Q460C高强钢T型圆管节点疲劳性能试验研究[J].土木工程学报,2017,50(4):57-63,124.(CHENG Rui,CHEN Yang,CUIJia,et al.Experimental study on fatigue behavior of Q460C high strength steel welded tubular T-joints under axial loading[J].China Civil Engineering Journal,2017,50(4):57-63,124.(in Chinese)).
[16]李文超.微观机制断裂理论在高强钢材料及钢结构断裂预测分析中的应用研究[D].西安:长安大学,2017.(LIWen-chao.Research on application of micro-mechanism based fracture theory in fracture prediction analysis of high-strength steel and structures[D].Xi’an:Chang’an University,2017.(in Chinese))
[17]祝磊,石永久,王元清.TX型圆管相贯节点空间作用下的极限承载力分析[J].钢结构,2004,19(2):20-24.(ZHU Lei,SHI Yong-jiu,WANG Yuan-qing.Ultimate capacity of circular tubular TX-joints under multiplanar loads[J].Steel Construction,2004,19(2):20-24.(in Chinese))