残余应力对焊接接头裂尖蠕变性能的影响
|
摘要
核电一回路安全端焊后冷缩过程极易产生残余应力,并且长时间处在高温、高压恶劣环境中,会导致力学性能降低,对核电安全产生严重的影响。因此,以紧凑拉伸试样为研究对象,借助ABAQUS有限元分析软件模拟焊接接头冷缩过程中产生的残余应力对裂尖蠕变性能的影响。结果表明:残余应力的存在导致蠕变后裂尖处的Mises应力、等效蠕变量均增大,并且在蠕变初始阶段蠕变速率较大,缩短了裂纹的起裂时间,使得结构构件更易发生失稳破坏,影响核电运行安全。
The residual stresses are easily produced during the cold shrinkage process after welding in a nuclear power circuit safe end, and the nuclear power circuit safe end serves at high temperature and in high pressure for a long period of time, which results in sharp decrease of mechanical properties and has a serious impact on nuclear safety. Taking the compact tensile specimen as the research object and the effect of residual stress generating in the cold shrinkage process on creep properties of crack tip was simulated using ABAQUS. The results show that the Mises stress, equivalent creep amount at the crack tip increase due to the residual stress, and the creep rate is bigger at the initial stage of creep, which shortens the crack initiation time, makes the structural members more prone to destabilize and damage and affects the safety of nuclear power operation.
The residual stresses are easily produced during the cold shrinkage process after welding in a nuclear power circuit safe end, and the nuclear power circuit safe end serves at high temperature and in high pressure for a long period of time, which results in sharp decrease of mechanical properties and has a serious impact on nuclear safety. Taking the compact tensile specimen as the research object and the effect of residual stress generating in the cold shrinkage process on creep properties of crack tip was simulated using ABAQUS. The results show that the Mises stress, equivalent creep amount at the crack tip increase due to the residual stress, and the creep rate is bigger at the initial stage of creep, which shortens the crack initiation time, makes the structural members more prone to destabilize and damage and affects the safety of nuclear power operation.
引文
[1]陆永浩,褚武扬,高克玮,等.304L不锈钢在高温水中的应力腐蚀裂纹扩展[J].金属学报,2004,40(7):763-767.
[2]Bao S Y,Li Y B,Gao Z L.Finite element analysis of cylinder creep under high temperature gradient[J].Materials for MechanicalEngineering,2014,38(4):78-81.
[3]王海涛.核电安全端异种金属焊接接头局部力学性能及断裂行为[D].上海:华东理工大学,2013.
[4]宋晓梅.残余应力对不同几何和材料拘束试样蠕变裂纹起裂和扩展行为的影响[D].上海:华东理工大学,2016.
[5]张国栋,周昌玉,薛吉林.内压与焊接残余应力共同作用下高温管道蠕变有限元分析[J].金属学报,2008,44(10):1271-1276.
[6]张星.残余应力作用下P92钢蠕变裂纹扩展研究[D].天津:天津大学,2010.
[7]金属拉伸蠕变及持久实验方法:GB/T2039-1997[S].北京:中国标准出版社,1997.
[8]Standard test method for plane strain fracture toughness of metallic materials:ASTM Standard E399-90[S].Annual Book of ASTMStandards.USA:ASTMInternational,2002.
[9]杨富强.核电结构材料裂尖蠕变特征和环境致裂定量预测模型研究[D].西安:西安科技大学,2014.
[10]穆霞英.蠕变力学[M].西安:西安交通大学出版社,1990:6.
[11]李光福,杨武.核电站异材焊接件的破裂问题与应力腐蚀评价方法[J].核安全,2003(2):37-40.
[12]ZukiSSM,ShahidanS,KeongCK,etal.Concrete-filleddouble skin steel tubular columnsexposed to ASTM E-119 fire curve for 60and90minutesoffire[C]//2017:02009.
[13]Dassault Systemes Simulia Corp.Abaqus analysis user's manual6.14[EB/CD].2014.
[2]Bao S Y,Li Y B,Gao Z L.Finite element analysis of cylinder creep under high temperature gradient[J].Materials for MechanicalEngineering,2014,38(4):78-81.
[3]王海涛.核电安全端异种金属焊接接头局部力学性能及断裂行为[D].上海:华东理工大学,2013.
[4]宋晓梅.残余应力对不同几何和材料拘束试样蠕变裂纹起裂和扩展行为的影响[D].上海:华东理工大学,2016.
[5]张国栋,周昌玉,薛吉林.内压与焊接残余应力共同作用下高温管道蠕变有限元分析[J].金属学报,2008,44(10):1271-1276.
[6]张星.残余应力作用下P92钢蠕变裂纹扩展研究[D].天津:天津大学,2010.
[7]金属拉伸蠕变及持久实验方法:GB/T2039-1997[S].北京:中国标准出版社,1997.
[8]Standard test method for plane strain fracture toughness of metallic materials:ASTM Standard E399-90[S].Annual Book of ASTMStandards.USA:ASTMInternational,2002.
[9]杨富强.核电结构材料裂尖蠕变特征和环境致裂定量预测模型研究[D].西安:西安科技大学,2014.
[10]穆霞英.蠕变力学[M].西安:西安交通大学出版社,1990:6.
[11]李光福,杨武.核电站异材焊接件的破裂问题与应力腐蚀评价方法[J].核安全,2003(2):37-40.
[12]ZukiSSM,ShahidanS,KeongCK,etal.Concrete-filleddouble skin steel tubular columnsexposed to ASTM E-119 fire curve for 60and90minutesoffire[C]//2017:02009.
[13]Dassault Systemes Simulia Corp.Abaqus analysis user's manual6.14[EB/CD].2014.