Abstract: Bolted flange joints were simulated with the finite element software Ansys, getting the gasket stress distribution under the condition of the preload and operation, and calculating the gasket stress under different working condition of internal pressure. Due to constant fluctuations in pipeline pressure and the pipe stress complex, the working pressure, temperature, uncertain factors such as their own constraints on its tightness should be fully considered. The Monte Carlo method is used to have reliability analysis in pipeline working pressure fluctuating. Limit equation is created and according to the distribution of the variable type and limit equation using largescale software Matlab is used to repeat random sampling to calculate the probability of bolt flange leakages under different working pressures. The results show that, the additional load produced by working pressure fluctuation will have a very big effect on the bolt flange leak, that must be got seriously enough attention.

Key words: Pipe flange, Ansys, Additional load, Monte Carlo method, Leakage probability

摘要： 运用有限元软件Ansys对螺栓法兰接头进行模拟,得到了在预紧和操作工况下垫片的应力分布,计
算出不同内压工况下垫片的应力。采用MonteCarlo法在管道工作压力不断波动时进行可靠性分析,创建极限方程
并根据极限方程应用大型软件Matlab以变量的分布类型对变量进行反复随机抽样,计算出不同工作压力下螺栓法
兰泄漏的概率。分析结果表明,工作压力的波动产生的附加载荷对螺栓法兰泄漏会产生很大的影响,必须加以足够
的重视。

关键词: 管道法兰, Ansys, 附加载荷, MonteCarlo法, 泄漏概率