Deformation characteristics of pipe flanges are important in the leak rate based design of gasketed flanged connections. Not only the equilibrium of force between bolts and the clamped parts including flanges and a gasket but also the displacement between them should be considered in the design of gasketed flanged connections. Recently, finite element method (FEM) has widely been used in the analysis of flanged connections. However, analyses of pipe flanges based on the analytical method using classical theories such as the strength of materials are still important when parametric calculations of flanges are necessary.In this study, a method to analyze the stress and deformation of welding neck type flanges is demonstrated and the validity of the analysis is checked by experiment. A software using Visual Basic for Applications (VBA) is developed based on the method. The advantages of the software are that stresses and deformation of flanges are easily calculated by selecting a flange size and design conditions from a database. The validity of the results obtained by the software is also confirmed by comparing the calculated results with those obtained by FEA. A series of calculations have been done for Japanese Industrial Standard (JIS) flanges and the deformation characteristics are clarified when a flange is subjected to bolt loads and an internal pressure.
展开▼
机译：管道法兰的变形特性在基于垫片的法兰连接的泄漏率设计中很重要。在垫片式法兰连接的设计中，不仅要考虑螺栓与夹紧部件（包括法兰和垫片）之间的力平衡，而且还要考虑螺栓之间的位移。近年来，有限元方法（FEM）已广泛用于法兰连接的分析。但是，当需要对法兰进行参数计算时，使用经典理论（例如材料强度）基于分析方法对管道法兰进行分析仍然很重要。
本文研究了一种分析焊接颈型法兰的应力和变形的方法，并通过实验验证了该方法的有效性。基于该方法开发了使用Visual Basic for Applications（VBA）的软件。该软件的优势在于，通过从数据库中选择法兰尺寸和设计条件，可以轻松计算法兰的应力和变形。通过将计算的结果与通过FEA获得的结果进行比较，也可以确定通过软件获得的结果的有效性。对于日本工业标准（JIS）法兰已经进行了一系列计算，并且当法兰承受螺栓载荷和内部压力时，其变形特性得以阐明。
展开▼
