【作者】 高炳军； 张澳晴； 余雏麟； 董俊华；

【Author】 GAO Bingjun;ZHANG Aoqing;YU Chulin;DONG Junhua;School of Chemical Engineering and Technology,Hebei University of Technology;

【机构】 河北工业大学化工学院；

【摘要】 在基于非金属垫片相对压缩变形量的法兰连接泄漏率预测模型基础上,提出针对垫片蠕变变形与棘轮应变的修正计算方法。通过垫片性能试验获取了PTFE垫片压缩回弹曲线、基本泄漏率模型参数及其与压紧面粗糙度的关系。对内压与循环弯矩作用下的法兰连接结构进行了泄漏测试,并对法兰连接进行了有限元计算,获取了垫片预紧、内压与弯矩同时作用时的垫片变形,通过蠕变分析与循环塑性分析获取垫片在内压以及循环弯矩作用下的蠕变变形与棘轮应变,利用所提出的泄漏率修正计算模型计算了法兰连接结构的泄漏率,预测值与试验值能够较好地吻合。更多还原

【Abstract】 Based on the existing leakage rate prediction model for bolted flange with gasket relative compression deformation,an improved model has been proposed to tackle with gasket with creep deformation and ratcheting deformation.Through gasket performance testing,the compressionrecovery curve of the PTFE gasket,the parameters of the basic leakage rate model,and their relationship with the surface roughness of the sealing faces were obtained.Leakage tests were conducted on flange connections subjected to internal pressure and cyclic bending moments.Finite element calculations were performed on the flange connections to determine the gasket deformation under the combined action of bolt pretension,internal pressure,and bending moments.Creep analysis and cyclic plastic analysis were used to obtain the creep deformation and ratcheting strain of the gasket under internal pressure and cyclic bending moments.Using the proposed modified leakage rate calculation model,the leakage rate of the flange connection structure was calculated,and the predicted values showed good agreement with the experimental results.更多还原