管フランジ締結体の特性に及ぼすハブ部の影響

概要

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The use of pipe flange connections is standardised in the codes of JIS, ASME, DIN and so on. However, these codes are almost entirely dependant on experience, and subsequently some problems concerning pipe flange connections have been encountered. In the Present paper, the distribution of contact stresses which governs the sealing performance is analyzed as a three-body contact problem, using an axisymmetrical three-dimensional theory of elasticity. The effects of the stiffness and the thickness of raised face metallic gaskets on the contact stresses and the effective gasket seating width are shown by numerical calculations. Moreover, stresses produced on the hub, the force ratio (the relationship between an increment of bolt axial force and an internal pressure) and the maximum stress caused in bolts are analyzed. For verification, experiments are carried out. The analytical results are satisfactorily consistent with the experimental results.
1989-08-25