超高压管式反应器端部结构应力场的数值模拟.pdf

设计计算
超高压管式反应器端部结构应力场的数值模拟
危书涛2,陈学东12,崔军,聂德福,金有海
(1.中国石油大学(华东)化学工程学院,山东青岛266580,2.合肥通用机械研究院,安徽合肥
230031)
摘要:基于大型通用有限元软件 ANSYS,对发生疲劳断裂的超高压管式反应器的端部结构进行数
值模拟,分析了其在过盈套合、自增强处理以及服役期间开停工循环載荷三种工况下的局部应力
场。结果表明;三种工况下,端部结构在过盈套合边缘局部范围内均存在较高的轴向拉应力,且大
于环向应カ;局部轴向应カ随套合过盈量和自增强压カ的增加而增大;半径过盈量为0.05mm时,
开停工循环载荷下的局部轴向平均应カ最大值可达86.71MPa,轴向交变应カ幅值最大值达到
62.2MPa,裂纹垂直于轴向扩展的推动力较大。模拟分析结果对端部结构失效破坏原因的分析及
其设计改进有一定的指导意义。
关键词;超高压管式反应器;疲劳断裂;过盈配合;自增强;数值模拟
中图分类号:TH49;TE966;TU973.254文献标识码:A文章编号:1001-4837(2012)10-0023-06
doi:10.3969/j.issn.1001-4837.2012.10.005
Numerical Simulation of Stress Field of End Structure
of Ultrahigh Pressure Tubular Reactor
WEI Shu-tao, 2, CHEN Xue-dong,2, CUI Jun, NIE DE-FU?.JIN You-hai
(1. College of Chemical Engineering, China University of Petroleum (East China), Shandong 266580
China; 2. Hefei General Machinery Research Institute, Hefei 230031, China)
Abstract: Numerical simulation was carried out on the end structure of the ultrahigh pressure polyethylene
tubular reactor in which fatigue fracture occurred based on the finite element program-ansys. The local
stress field of the reactor was analyzed after its shrink-fit, autofrettage treatment and under the on-serv
ice startup and shutdown cyclic loading. The results show that axial tensile stress is high on the location at
e edge
the shrink-fit under the shrink-fit and the startup and shutdown cyclic loading, and it's lar-
ger than hoop stress; The local axial stress increases with the increase of shrink range and autofrettage
stress; The reactor with 0.05 mm shrink range are analyzed, the maximal local axial mean stress is 86.71
Mpa, the maximal local axial alternating stress amplitude is 62.2 Mpa, which indicates that the crack
driving force perpendicular to the axial direction is relative larger. The simulated results can provide some
insight into the reason of failure and the improvement of the end structure
Key words: ultrahigh pressure bular reactor atigue fracture; shrink fit; au fret e; numerical simulation
基金项目:国机集团科技发展基金资助项目( SINOMACH11科90-26号);国家科研院所技术开发研究专项基金(2012EC219272)
中石化科技开发项目(308039)