Abstract
In designing bolted joints, it is important to examine the sealing performance and to estimate the force ratio, that is the ration of an increment of bolt axial force to a load. Up to now, in order to improve the sealing performance, raised faces of interface have been used. But the uses of these interfaces depend on experience and the theoreticial grounds are not made clear. In this paper, in the case of pipe flanges having raised faces, the sealing performances are analyzed by using a three-dimensional theory of elasticity and the point matching method. Then, the force ration is analyzed. Moreover, with an application of the load a bending moment is produced in bolts and a stress is caused by the bending moment. This bending moment is also analyzed. In order to verify these analyses experiments are performed. Analytical results are in a fairly good agreement with experimental ones.
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