温度场作用下有初始间隙的补强圈接触特性和应力分析
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摘要
补强圈和壳体在载荷作用下会产生一定的相对位移和转动进而产生接触压力,接触压力会对补强结构应力分布产生显著的影响。基于有限元法,采用非线性接触分析对补强圈与壳体之间的接触特性和应力变化进行分析并得出了结论:接触压力是真实存在的、且随内压的增加而逐渐增大,内压单独作用下最大总应力出现在接管根部;温度场耦合作用且温差达到一定值时,接触压力显著增大,最大总应力位置变化至外焊缝位置中间段;初始间隙的存在会影响接触压力的大小,但对总应力值几乎无影响。
Contact pressure will be produced due to relative displacement and rotation of the reinforcement ring and shell under loads,and the contact pressure will have significant influence on stress distribution of the structure of the reinforcement ring. In this paper,the characteristics of contact between the reinforcement ring and the shell structure and stress variation were analyzed using nonlinear contact analysis based on the finite element method,and it was concludes that: the contact pressure actually exists and increases gradually with the increase of internal pressure,and the maximum total stress appears at root of nozzle. When there exists the coupling effect of temperature field and the temperature difference reaches a certain value,the contact pressure increases significantly,and the position of maximum total stress shifts to the middle section of the position of outer weld. The presence of initial gap will affect the magnitude of contact pressure,but has little influence on the value of total stress.
Contact pressure will be produced due to relative displacement and rotation of the reinforcement ring and shell under loads,and the contact pressure will have significant influence on stress distribution of the structure of the reinforcement ring. In this paper,the characteristics of contact between the reinforcement ring and the shell structure and stress variation were analyzed using nonlinear contact analysis based on the finite element method,and it was concludes that: the contact pressure actually exists and increases gradually with the increase of internal pressure,and the maximum total stress appears at root of nozzle. When there exists the coupling effect of temperature field and the temperature difference reaches a certain value,the contact pressure increases significantly,and the position of maximum total stress shifts to the middle section of the position of outer weld. The presence of initial gap will affect the magnitude of contact pressure,but has little influence on the value of total stress.
引文
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[14]钢制化工容器结构设计规定:HG/T 20583—2011[S].
[2]刘建峰,陶国庆,张绍华,等. LNG低温球阀阀盖颈部温度场的数值模拟[J].流体机械,2016,44(3):34-37.
[3]李定,孟祥铠,李纪云.核主泵流体动压型圆形深槽密封的热流耦合分析[J].流体机械,2016,44(12):18-24.
[4]曹宇.基于欧盟标准的开孔蠕变分析计算[J].压力容器,2018,35(1):29-37.
[5]胡晓云,王磊,甘蓓,等.食品接触材料及制品中芳香胺毒性与检测方法研究进展[J].包装与食品机械,2018,36(3):54-58.
[6]姜卫忠.压力容器筒体与补强圈间的接触特性[J].压力容器,2003,20(2):20-23.
[7]李磊,吴本华,桑芝富.压力容器筒体与补强圈间接触特性的研究[J].机械强度,2007,29(6):975-981.
[8]贾春明,石成江.基于ANSYS补强圈与筒体间接触的有限元分析[J].化工机械,2010,37(4):450-453.
[9]吴本华,桑芝富.接管纵向弯矩作用下补强圈与壳体间的接触行为[J].压力容器,2004,21(6):14-17.
[10] Chen H,Chao Y J. Contact between vessel shell and welded pad in nozzle reinforcement[J]. Journal of Pressure Vessel Technology,1993,115(12):364-372.
[11]沈洁,刘鹏,李玉伟,等.压力容器补强圈与筒体间接触特性的应力分析研究[J].锅炉制造,2015(4):49-52.
[12]赵吉星,丁立人,刘小宁.补强圈与壳体接触特性的有限元分析[J].压力容器,2010,27(7):22-26.
[13]余伟炜,高炳军. ANSYS在机械与化工装备中的应用[M].第二版.北京:中国水利水电出版社,2007.
[14]钢制化工容器结构设计规定:HG/T 20583—2011[S].