Simulation Calculation of Long-term Sealing Performance of High-temperature Bolt Flange System
Studying the high-temperature mechanics and sealing performance of bolted flange joints is of great signifi-cance for their reliability research and preventing the failure of static sealing systems.However,there is relatively little re-search on the sealing performance of flange joints that have been in service for a long time,especially for high-temperature flange joints that require insulation.A deformation coordination equation was established based on the deformation of each component of the bolted flange joint,and a finite element model of the flange joint was established by ANSYS software to calculate the stress distribution of each component of the flange joint under high temperature conditions and different creep duration.The theoretical calculation results are similar to the finite element simulation results,indicating that the estab-lished model can be used to evaluate the long-term sealing performance of high-temperature flange joints.The research re-sults indicate that the high stress in bolted flange joints is concentrated at the contact between the nut and flange surface,the corner of the flange structure,and the middle part of the bolt.The causes of stress concentration are mainly caused by bolt load and structure discontinuity.Under high temperature conditions,with the extension of service time,the stress of each component of the flange joint decreases significantly.Through the verification of strength and sealing performance,it is found that gasket creep is the main cause of flange joint failure.
high temperature creepflange jointlong-term sealing performancedeformation coordination equationcreep-relaxation
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