On the Characteristics of Bolted Joints with Gaskets : Stress Analysis of Full-Face Metallic Gaskets Compressed by a Cover of Pressure Vessel

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This paper deals with a contact stress distribution in bolted joints when a full-face metallic gasket is used between a cover and a base of pressure vessel. Replacing the cover, the gasket and the base with a finite cylinder and two finite follow cylinders respectively, the contact stress distribution is analyzed using three-dimensional theory of elasticity. Effects of the thickness and the stiffness of gaskets on the contact stress distribution are shown by numerical computations. Next, the force ratio of bolted joints with gaskets, which is a ration of an increment of bolt axial force to an inner pressure, and the sealing performance are analyzed. A bending moment is produced in bolts by the inner pressure. The maximum stress produced in bolts is also analyzed taking the bending moment into consideration. For verification of the analytical method, experiments are performed. Analytical results are in a fairly good agreement with experimental ones.
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