热冲击下自增强反应器残余应力松弛研究
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摘要
基于Von Mise屈服准则,通过ABAQUS软件研究了热冲击对自增强超高压聚乙烯反应器残余应力的影响,得到了热冲击后自增强残余应力的分布情况,分析了热冲击下自增强反应器残余应力松弛的规律及原因。结果表明,在热冲击作用下主要在靠近反应器内壁2mm区域内残余应力发生了松弛,内壁的应力松弛率最大;热冲击过程热应力与自增强残余应力的叠加使近内壁区域产生了压缩切向塑性变形,导致反应器残余应力重新分布,当残余应力衰减到一定值时,热应力与残余应力的叠加值不足以使反应器继续发生切向塑性变形,此时残余应力不会继续衰减。
Based on the Von Mise yield criterion,the finite element software ABAQUS was used to studied the effect of thermal shock process on autofrettaged residual stress in the ultra-high pressure polyethylene reactor,the distribution of autofrettaged residual stress after thermal shock was obtained,and the law and reason of residual stress relaxation in autofrettaged reactor under thermal shock were analyzed.The results showed that the relaxation of the residual stress mainly occurred within 2 mm of the inner wall,and the relaxation rate of the inner wall was the highest;The superposition of the thermal stress and the autofrettaged residual stress caused the compressive tangential plastic deformation near the inner wall area,resulted in the redistribution of the residual stress of the reactor.When the residual stress relaxed to a certain value,the superposition was not enough to continue the tangential plastic deformation of the reactor,then the residual stress would not continue to relax.
Based on the Von Mise yield criterion,the finite element software ABAQUS was used to studied the effect of thermal shock process on autofrettaged residual stress in the ultra-high pressure polyethylene reactor,the distribution of autofrettaged residual stress after thermal shock was obtained,and the law and reason of residual stress relaxation in autofrettaged reactor under thermal shock were analyzed.The results showed that the relaxation of the residual stress mainly occurred within 2 mm of the inner wall,and the relaxation rate of the inner wall was the highest;The superposition of the thermal stress and the autofrettaged residual stress caused the compressive tangential plastic deformation near the inner wall area,resulted in the redistribution of the residual stress of the reactor.When the residual stress relaxed to a certain value,the superposition was not enough to continue the tangential plastic deformation of the reactor,then the residual stress would not continue to relax.
引文
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[14]陈国理.超高压容器设计[M].北京:化学工业出版社,1997:52-55.CHEN G L.Design of ultra-high pressure vessel[M].Beijing:Chemical Industry Press,1997:52-55.
[15]李强,李鹏辉,赵军官,等.冲击载荷下自增强身管残余应力变化规律[J].爆炸与冲击,2011,31(6):635-640.LI Q,LI P H,ZHAO J G,et al.Residual stress variation in an autofrettaged barrel under impact load[J].Explosion and shock waves,2011,31(6):635-640.
[2]朱金花,秦宗川,徐鹏.在役自增强反应管残余应力衰减规律及影响[J].压力容器,2011,28(9):7-9,14.ZHU J H,QIN Z C,XU P.Relaxation law and effect of residual stress of autofrettaged tubular reactor in service[J].Pressure vessel technology,2011,28(9):7-9,14.
[3]孙宝财,吴恭平,李沧,等.超高压管道失效模式及防护对策研究[J].化工机械,2015,42(2):162-166.SUN B C,WU G P,LI C,et al.Research of failure modes and countermeasures for ultrahigh pressure pipeline[J].Chemical engineering&machinery,2015,42(2):162-166.
[4]潘秉智.在役自增强反应管残余应力松弛规律试验研究[J].压力容器,1994,11(5):43-51.PAN B Z.Experimental study on relaxation law of residual stress in autofrettaged reactive tube in service[J].Pressure vessel technology,1994,11(5):43-51.
[5]薛青利,朱瑞东,潘秉智.对自增强圆筒残余应力松弛的初步探讨[J].化工设备与管道,1991(5):17-22.XUE Q L,ZHU R D,PAN B Z.Preliminary study on the residual stress relaxation of autofrettaged cylinder[J].Process equipment&piping,1991(5):17-22.
[6]刘康林.超高压聚乙烯反应管安全评定[J].石油化工设备,2001,30(6):1-4.LIU K L.Safety assessment for ultrahigh pressure polyethylene reaction tube[J].Petro-chemical equipment,2001,30(6):1-4.
[7]包行方.自增强残余应力的衰减对在役高压聚乙烯反应器安全性影响的探讨[J].金山油化纤,1990,9(1):52-59.BAO X F.Discussion on the security impact of relaxation of autofrettaged residual stress in ultra-high reaction tube in service[J].Petrochemical fiber of Jinshan,1990,9(1):52-59.
[8]李秀波.超高压管式反应器的检验和维护[J].化工科技,2010,18(6):50-52.LI X B.Test and maintenance of super high pressure tube reactor[J].Science&technology in chemical industry,2010,18(6):50-52.
[9] Dupont Nemours E I.Relief device sizing for ethylene decompositions-high pressure ethylene industry[J].American institute of chemical engineers,2007,27(1):35-40.
[10]Shannon D I.Relief device sizing for ethylene decompositions—high pressure polyethylene industry[J].Process safety progress,2010,27(1):35-40.
[11]贠英伟.厚壁圆筒热冲击作用下的温度场[J].洛阳工业高等专科学校学报,2005,15(2):25-28.YUAN Y W.Temperature field of thick wall cylinder by thermal shock treatment[J].Journal of Luoyang technology college,2005,15(2):25-28.
[12]Yakeuti T,Ishida R,Tauigawa Y.On an axisymmetric coupied thermal stress problem in a finite circular cylinder[J].Journal of applied mechanics,1983,50(3):116-122.
[13]胡林星.聚乙烯超高压反应管残余应力的特性研究[D].广州:华南理工大学,2011:7-8.HU L X.Study on the characteristics of residual stress in polyethylene ultra-high pressure reactor[D].Guangzhou:South China University of Technology,2011:7-8.
[14]陈国理.超高压容器设计[M].北京:化学工业出版社,1997:52-55.CHEN G L.Design of ultra-high pressure vessel[M].Beijing:Chemical Industry Press,1997:52-55.
[15]李强,李鹏辉,赵军官,等.冲击载荷下自增强身管残余应力变化规律[J].爆炸与冲击,2011,31(6):635-640.LI Q,LI P H,ZHAO J G,et al.Residual stress variation in an autofrettaged barrel under impact load[J].Explosion and shock waves,2011,31(6):635-640.