Limit-load-bearing capacity calculation of cylindrical shells with tangential nozzles under internal pressure
Serious structural discontinuity and high local stresses exist with the tangential nozzle opening structure of pressure vessels,and there are no conventional design method for the cylindrical shells with tangential nozzles.The limit-load analysis method was employed to investigate the influences of different dimensionless structural parameters,namely diameter ratio do/Di≤0.3,diameter-thickness ratio Di/T≤125 and thickness ratio t/T≤1.75,on the load-bearing capacity of the cylindrical shells,and a so-called strength weakening coefficient was defined based on the strength of the cylindrical shells.The results show that these three factors all have a significant impact on the strength of the cylindrical shell with tangential nozzles.Specifically,when do/Di and Di/T increase but t/T decreases,the strength weakening coefficient increases,which means that strength weakening effect of the tangential nozzle on the cylindrical shell increases.With sufficient simulation results,regression equations for the strength weakening coefficient were obtained,which provides reference for the strength design of the internal pressure cylinders with tangential nozzles.
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