中文摘要：

为准确评价螺栓法兰连接结构的紧密性，采用解析方法对螺栓法兰连接中非线垫片沿径向变形量和应力分布进行研究。解析方法计算得到的垫片变形量与应力分布与有限元法计算结果基本一致，但较有限元法计算的稍偏小。分析结果表明，垫片变形量及沿径向的应力分布都是不均匀的，由垫片内径向外径逐渐增大。

英文摘要：

In order to evaluate the tightness of bolted flanged connections accurately, the deformation and the contact stress along the radial direction of nonlinear gaskets have been researched using analytical method. The analytical results obtained by analytical method were compared with those by finite element analysis （FEA）, which shows that the results calculated by two methods are fundamentally coincident, but the former is smaller than the latter. The results indicate that both the deformation and the contact stress of gaskets distribute non-uniformly along the gasket radial direction, and they all increase from gasket inner margin to its outer margin.