管フランジの三次元有限要素解析 : 座面形状の影響について

抄録

Geometry of pipe flange is standardized by JIS in detail and it almost follows ISO. However, the dimensions thus specified are not necessarily determined on the basis of estimating the mechanical behaviors of pipe flanges. It is, therefore, extremely important to systematically examine the mechanical properties for making more rational standards. In this study, as a first stage of this purpose, a numerical approach, which can efficiently analyze fundamental mechanical characteristics of pipe flange using FEM as a three-dimensional elastic contact problem, is proposed, and the effects of such important factors as flange interface geometry, numbers of bolts, thickness of flange and nominal diameter of clamping bolts are discussed. The analytical objects are pipe flanges specified in JIS B 2238. The validity of the numerical method proposed here is ascertained by experiment, where pipe flanges are subjected to axial tension and internal pressure, and experimental results of variations in tensile stress of clamping bolts are compared with those by FEM.