某火电机组三连杆恒力弹簧支吊架弹簧拉杆断裂原因
Fracture Cause of Spring Pull Rod of Constant Spring Support withThree Connecting Rods of a Thermal Power Unit
摘 要
某火电机组三连杆恒力弹簧支吊架弹簧拉杆发生断裂，通过宏/微观形貌观察、化学成分分析、显微组织观察、力学性能测试及受力仿真计算等方法分析了弹簧拉杆断裂原因。结果表明：断裂弹簧拉杆材料为疲劳性能较差的非调质态45钢；弹簧拉杆螺纹加工长度不足及表面加工缺陷使其在第一个螺纹牙根部产生应力集中，形成裂纹源；三连杆恒力弹簧支吊架在运行过程中，其内部弹簧拉杆发生偏斜，承受附加弯矩，在轴向拉力、弯曲载荷及管道振动产生的附加交变应力的共同作用下，弹簧拉杆发生低应力高周疲劳断裂。
弹簧拉杆
螺纹
应力集中
疲劳
constant spring support
spring pull rod
thread
stress concentration
fatigue
Abstract
A spring pull rod of constant spring support with three connecting rods of a thermal power unit was broken. The fracture cause of spring pull rod was analyzed by means of macro and micro morphology observation, chemical composition analysis, microstructure observation, mechanical property testing and force simulation. The results show that the material of fractured spring pull rod was non-quenched and tempered 45 steel with poor fatigue performance. Stress concentration at the root of the first thread was caused by the insufficient thread processing length and surface processing defects of the spring pull rod, which formed the crack source. During the operation of constant spring support with three connecting rods, the internal spring pull rod was deflected and subjected to additional bending moment. Under the joint action of axial tension, bending load, and additional alternating stress produced by pipe vibration, low stress high cycle fatigue fracture of the spring pull rod occurred.
中图分类号 TK264.9 DOI 10.11973/jxgccl202203015
所属栏目 失效分析
基金项目
收稿日期 2021/3/10
修改稿日期 2022/1/17
网络出版日期
作者单位点击查看
备注刘明(1985-),男,安徽宣城人,高级工程师,硕士
引用该论文: LIU Ming,BAI Jia,WANG Lu,FANG Lulu,DING Qiaofeng. Fracture Cause of Spring Pull Rod of Constant Spring Support withThree Connecting Rods of a Thermal Power Unit[J]. Materials for mechancial engineering, 2022, 46(3): 89～94
刘明,白佳,王鲁,房璐璐,丁乔峰. 某火电机组三连杆恒力弹簧支吊架弹簧拉杆断裂原因[J]. 机械工程材料, 2022, 46(3): 89～94
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参考文献
【1】仝国岭, 张传鑫, 魏培.恒力弹簧支吊架的形式及其受力分析[J].化工设备与管道, 2016, 53(3):76-80. TONG G L, ZHANG C X, WEI P.Structure type of constant force spring support and its loading analysis[J].Process Equipment & Piping, 2016, 53(3):76-80.
【2】康豫军, 姚军武, 王必宁, 等.恒力吊架荷载离差对管系热位移影响的研究[J].热力发电, 2009, 38(5):72-76. KANG Y J, YAO J W, WANG B N, et al.Study on the influence of load deviation in constant-forced hanging bracket upon piping's thermal displacement[J].Thermal Power Generation, 2009, 38(5):72-76.
【3】康豫军, 王军民, 王必宁, 等.某电厂300 MW机组主蒸汽管道恒力吊架螺纹吊杆断裂原因分析[J].热力发电, 2008, 37(12):99-102. KANG Y J, WANG J M, WANG B N, et al.Cause analysis of screwed hanger rod breakage on constant force hanging bracket for main steam pipeline of 300 MW unit in one power plant[J].Thermal Power Generation, 2008, 37(12):99-102.
【4】覃泽棒, 黄浩坤, 肖志前.某火力发电厂600 MW机组低温再热蒸汽管道恒力吊架吊杆断裂原因分析及解决方案[J].广东电力, 2012, 25(3):109-113. QIN Z B, HUANG H K, XIAO Z Q.Cause analysis on suspender breakage of constant force hanger for low-temperature reheating steam piping in 600 MW units in a fossil-fuel power plant and the solutions[J].Guangdong Electric Power, 2012, 25(3):109-113.
【5】吴晓俊, 宋春毅, 王军民, 等.某电厂PHB型恒力吊架螺纹吊杆断裂原因分析[J].热力发电, 2011, 40(9):89-91. WU X J, SONG C Y, WANG J M, et al.Cause analysis of fracture occurred on screwed hanging rod of PHB type constant force suspension bracket in one power plant[J].Thermal Power Generation, 2011, 40(9):89-91.
【6】王海帅, 张鹏, 胡锋.某恒力吊架弹簧连杆断裂原因分析[J].理化检验(物理分册), 2020, 56(4):46-48. WANG H S, ZHANG P, HU F.Cause analysis on fracture of spring linkage of a constant force hanger[J].Physical Testing and Chemical Analysis (Part A:Physical Testing), 2020, 56(4):46-48.
【7】孙智, 江利, 应展鹏.失效分析——基础与应用[M].北京:机械工业出版社, 2011. SUN Z, JIANG L, YING Z P. Failure analysis-fundamentals and applications[M]. Beijing:China Machine Press, 2011.
【8】李春艳, 汪纯慧, 陈伟, 等.不同温度淬火对45钢疲劳裂纹扩展行为的影响[J].机械工程材料, 2017, 41(10):69-73. LI C Y, WANG C H, CHEN W, et al.Effect of different-temperature quenching on fatigue crack propagation behavior of 45 steel[J].Materials for Mechanical Engineering, 2017, 41(10):69-73.
【9】冷真龙.恒力吊架优化设计[D].成都:西南交通大学, 2005. LENG Z L.Optimized design for constant force hanger[D].Chengdu:Southwest Jiaotong University, 2005.
【10】朱海宝, 李戈, 陈卓婷, 等.超临界机组小汽轮机高调门调速油伺服阀螺栓断裂的原因[J].机械工程材料, 2019, 43(5):75-78. ZHU H B, LI G, CHEN Z T, et al.Fracture reason of servo valve bolt of electrohydraulic oil of high regulating valve of small steam turbine in supercritical unit[J].Materials for Mechanical Engineering, 2019, 43(5):75-78.
【11】陆颜, 谈金祝, 李洋, 等.某氢气往复式压缩机连接螺栓的断裂原因[J].机械工程材料, 2021, 45(1):105-108. LU Y, TAN J Z, LI Y, et al.Fracture cause of connecting bolts in a hydrogen reciprocating compressor[J].Materials for Mechanical Engineering, 2021, 45(1):105-108.
【12】林元华, 施太和, 姚振强, 等.钻具螺纹接头力学性能计算方法及其应用[J].上海交通大学学报, 2005, 39(7):1058-1062. LIN Y H, SHI T H, YAO Z Q, et al.A model to compute the mechanical property of drillpipe tool joint and its application[J].Journal of Shanghai Jiaotong University, 2005, 39(7):1058-1062.
【13】尹益辉, 余绍蓉.基于3D有限元模拟的螺栓接头变形-内力关系及在设计中的应用[J].机械强度, 2008, 30(6):947-952. YIN Y H, YU S R.Relations between internal forces and deformation of a bolt joint with their application to design based on 3D FEM simulation[J].Journal of Mechanical Strength, 2008, 30(6):947-952.
【2】康豫军, 姚军武, 王必宁, 等.恒力吊架荷载离差对管系热位移影响的研究[J].热力发电, 2009, 38(5):72-76. KANG Y J, YAO J W, WANG B N, et al.Study on the influence of load deviation in constant-forced hanging bracket upon piping's thermal displacement[J].Thermal Power Generation, 2009, 38(5):72-76.
【3】康豫军, 王军民, 王必宁, 等.某电厂300 MW机组主蒸汽管道恒力吊架螺纹吊杆断裂原因分析[J].热力发电, 2008, 37(12):99-102. KANG Y J, WANG J M, WANG B N, et al.Cause analysis of screwed hanger rod breakage on constant force hanging bracket for main steam pipeline of 300 MW unit in one power plant[J].Thermal Power Generation, 2008, 37(12):99-102.
【4】覃泽棒, 黄浩坤, 肖志前.某火力发电厂600 MW机组低温再热蒸汽管道恒力吊架吊杆断裂原因分析及解决方案[J].广东电力, 2012, 25(3):109-113. QIN Z B, HUANG H K, XIAO Z Q.Cause analysis on suspender breakage of constant force hanger for low-temperature reheating steam piping in 600 MW units in a fossil-fuel power plant and the solutions[J].Guangdong Electric Power, 2012, 25(3):109-113.
【5】吴晓俊, 宋春毅, 王军民, 等.某电厂PHB型恒力吊架螺纹吊杆断裂原因分析[J].热力发电, 2011, 40(9):89-91. WU X J, SONG C Y, WANG J M, et al.Cause analysis of fracture occurred on screwed hanging rod of PHB type constant force suspension bracket in one power plant[J].Thermal Power Generation, 2011, 40(9):89-91.
【6】王海帅, 张鹏, 胡锋.某恒力吊架弹簧连杆断裂原因分析[J].理化检验(物理分册), 2020, 56(4):46-48. WANG H S, ZHANG P, HU F.Cause analysis on fracture of spring linkage of a constant force hanger[J].Physical Testing and Chemical Analysis (Part A:Physical Testing), 2020, 56(4):46-48.
【7】孙智, 江利, 应展鹏.失效分析——基础与应用[M].北京:机械工业出版社, 2011. SUN Z, JIANG L, YING Z P. Failure analysis-fundamentals and applications[M]. Beijing:China Machine Press, 2011.
【8】李春艳, 汪纯慧, 陈伟, 等.不同温度淬火对45钢疲劳裂纹扩展行为的影响[J].机械工程材料, 2017, 41(10):69-73. LI C Y, WANG C H, CHEN W, et al.Effect of different-temperature quenching on fatigue crack propagation behavior of 45 steel[J].Materials for Mechanical Engineering, 2017, 41(10):69-73.
【9】冷真龙.恒力吊架优化设计[D].成都:西南交通大学, 2005. LENG Z L.Optimized design for constant force hanger[D].Chengdu:Southwest Jiaotong University, 2005.
【10】朱海宝, 李戈, 陈卓婷, 等.超临界机组小汽轮机高调门调速油伺服阀螺栓断裂的原因[J].机械工程材料, 2019, 43(5):75-78. ZHU H B, LI G, CHEN Z T, et al.Fracture reason of servo valve bolt of electrohydraulic oil of high regulating valve of small steam turbine in supercritical unit[J].Materials for Mechanical Engineering, 2019, 43(5):75-78.
【11】陆颜, 谈金祝, 李洋, 等.某氢气往复式压缩机连接螺栓的断裂原因[J].机械工程材料, 2021, 45(1):105-108. LU Y, TAN J Z, LI Y, et al.Fracture cause of connecting bolts in a hydrogen reciprocating compressor[J].Materials for Mechanical Engineering, 2021, 45(1):105-108.
【12】林元华, 施太和, 姚振强, 等.钻具螺纹接头力学性能计算方法及其应用[J].上海交通大学学报, 2005, 39(7):1058-1062. LIN Y H, SHI T H, YAO Z Q, et al.A model to compute the mechanical property of drillpipe tool joint and its application[J].Journal of Shanghai Jiaotong University, 2005, 39(7):1058-1062.
【13】尹益辉, 余绍蓉.基于3D有限元模拟的螺栓接头变形-内力关系及在设计中的应用[J].机械强度, 2008, 30(6):947-952. YIN Y H, YU S R.Relations between internal forces and deformation of a bolt joint with their application to design based on 3D FEM simulation[J].Journal of Mechanical Strength, 2008, 30(6):947-952.
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