热冲击与内压耦合下的厚壁圆筒应力分析
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摘要
针对超高压聚乙烯管式反应器超温分解时热冲击造成的安全性问题,建立厚壁圆筒有限元模型,采用直接耦合的方法,模拟分析了自增强处理后的厚壁圆筒承受波动内压同时经历热冲击后的温度、应力的分布情况,并对比了内压、热冲击、内压和热冲击耦合作用这3种载荷对自增强残余应力的影响。计算结果表明,热冲击后圆筒内壁温度梯度大,应力变化幅度大,外壁的温度梯度小,应力变化幅度小;等效应力最大值出现在内壁;内压单独作用后,残余应力分布基本不变,热冲击后的残余应力在内壁附近发生较大的变化。
In order to study the security problems of thermal shock caused by high temperature decomposition of ultrahigh pressure polyethylene tubular reactors,the finite model of thick cylinder was established.The direct coupling method was employed,and the temperature,stress and plastic deformation of an autofrettaged thick cylinder under fluctuating internal pressure and thermal shock were analyzed.The influences of internal pressure loading,thermal shock and internal pressure combined with thermal shock on residual stress of an autofrettaged thick cylinder were discussed.The conclusion suggests that the inner surface of cylinder was subjected to a sharp temperature gradient and large stress variation amplitude.There are small temperature and stress gradients in the outer surface of cylinder.The maximum equivalent stress appears on the inner wall.The residual stress is almost constant after the pressure loading and changed a lot near inner wall after thermal shock.Thermal shock has a great influence on the stress and strain near the inner wall.The results provide a certain basis for the safety of the ultrahigh pressure reactor.
In order to study the security problems of thermal shock caused by high temperature decomposition of ultrahigh pressure polyethylene tubular reactors,the finite model of thick cylinder was established.The direct coupling method was employed,and the temperature,stress and plastic deformation of an autofrettaged thick cylinder under fluctuating internal pressure and thermal shock were analyzed.The influences of internal pressure loading,thermal shock and internal pressure combined with thermal shock on residual stress of an autofrettaged thick cylinder were discussed.The conclusion suggests that the inner surface of cylinder was subjected to a sharp temperature gradient and large stress variation amplitude.There are small temperature and stress gradients in the outer surface of cylinder.The maximum equivalent stress appears on the inner wall.The residual stress is almost constant after the pressure loading and changed a lot near inner wall after thermal shock.Thermal shock has a great influence on the stress and strain near the inner wall.The results provide a certain basis for the safety of the ultrahigh pressure reactor.
引文
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[14]胡振杰.火炮发射过程中的身管热弹耦合分析[D].南京:南京理工大学,2007:28-38.(HU Zhen-jie.Coupling Analysis of the Tube in the Process of Gun Launch[D].Nanjing:Nanjing University of Science and Technology,2007:28-38.)
[15]杨世铭,陶文铨.传热学[M].北京:高等教育出版社,2006:229-296.(YANG Shi-ming,TAO Wen-quan.Heat Transfer Theory[M].Beijing:Higher Education Press,2006:229-296.)
[2]柳曾典,朱磊,王印培,等.在役高压聚乙烯管式反应器的安全性研究[J].压力容器,1992,9(1):11-19.(LIU Zeng-dian,ZHU Lei,WANG Yin-pei,et al.Safety Analysis of In-service Tubular Reactor in High Pressure Polyethylene Plant[J].Pressure Vessel Technology,1992,9(1):11-19.)
[3]鞠琦,刘长海.超高压自增强管式反应器损伤变量描述与应用[J].石油化工设备,2015,44(3):6-10.(JU Qi,LIU Chang-hai.Description and Application of Damage Variable for Extra-high Pressure Self-reinforced Tubular Reactor[J].Petro-chemical Equipment,2015,44(3):6-10.)
[4]刘长海.超高压管式反应器安全工程中损伤问题的研究[D].哈尔滨:哈尔滨工程大学,2003:20-66.(LIU Chang-hai.Research on Damage in the Safety Engineering of Ultra High Pressure Tubular Reactor[D].Harbin:Harbin Engineering University,2003:20-66.)
[5]杨艳峰,郑坚,狄长春,等.基于ANSYS火炮身管传热仿真[J].火力与指挥控制,2013(8):134-136.(YANG Yan-feng,ZHENG Jian,DI Chang-chun,et al.Simulation Research on Heat Transfer for Gun Barrel Based on ANSYS[J].Fire Control&Command Control,2013(8):134-136.)
[6]WU Chang-wei,WU Yong-hai,FAN Qin-man.Analysis of Temperature and Stress of a Thin-walled Cylinder Based on FEM[J].Applied Mechanics and Materials,2013,373-375:12-15.
[7]周俊忠.冲击载荷下身管强度自增强研究[D].哈尔滨:哈尔滨工程大学,2008:37-58.(ZHOU Jun-zhong.Research on Autofrettage of the Tube Intensity with Impact Load[D].Harbin:Harbin Engineering University,2008:37-58.)
[8]李鹏辉.火炮身管结构强度与损伤分析[D].太原:中北大学,2010:6-30.(LI Peng-hui.Structure Strength and Damage Analysis of Gun Barrel[D].Taiyuan:North University of China,2010:6-30.)
[9]张红松,时蕾.表面陶瓷层厚度对Sm2Zr2O7/8YSZ热障涂层热冲击性能的影响[J].中国表面工程,2013(2):76-81.(ZHANG Hong-song,SHI Lei.Effect of Surface Layer Thickness on Sm2Zr2O7/8YSZ Ceramic Thermal Shock Performance[J].China Surface Engineering,2013(2):76-81.)
[10]魏媛,李世显.单层厚度对Sm2Zr2O7/8YSZ热障涂层残余热应力的影响[J].中国陶瓷,2012(10):30-33.(WEI Yuan,LI Shi-xian.Effect of Thickness on the Thermal Residual Stress of Thermal Barrier Coating Sm2Zr2O7/8YSZ[J].China Ceramics,2012(10):30-33.)
[11]张红松,李世显.等离子喷涂Sm2Zr2O7/8YSZ热障涂层热冲击应力的数值模拟[J].材料保护,2013(7):25-28.(ZHANG Hong-song,LI Shi-xian.Numerical Simulation of Thermal Shock Stress of Plasma Sprayed Sm2Zr2O7/8YSZ Thermal Barrier Coating[J].Material Protection,2013(7):25-28.)
[12]郑小涛,王彪,喻九阳,等.热-机械载荷下厚壁圆筒自增强压力优化分析[J].压力容器,2012,29(9):24-27.(ZHENG Xiao-tao,WANG Biao,YU Jiu-yang,et al.Investigation on Autofrettage of Thick Cylinder under Internal Pressure and Thermal Load[J].Pressure Vessel Technology,2012,29(9):24-27.)
[13]贠英伟.厚壁圆筒热冲击作用下应力分布研究[D].哈尔滨:哈尔滨工程大学,2004:35-57.(YUN Ying-wei.Study of Thermal Stress Distribution on Thick Wall Cylinder by Thermal Shock Treatment[D].Harbin:Harbin Engineering University,2004:35-57.)
[14]胡振杰.火炮发射过程中的身管热弹耦合分析[D].南京:南京理工大学,2007:28-38.(HU Zhen-jie.Coupling Analysis of the Tube in the Process of Gun Launch[D].Nanjing:Nanjing University of Science and Technology,2007:28-38.)
[15]杨世铭,陶文铨.传热学[M].北京:高等教育出版社,2006:229-296.(YANG Shi-ming,TAO Wen-quan.Heat Transfer Theory[M].Beijing:Higher Education Press,2006:229-296.)