OPTIMIZATION OF DESIGN PARAMETERS OF BELLOWS EXPANSION JOINTS

A technique for optimizing the design parameters of the metal corrugated shell of bellows expansion joints is proposed. The purpose of the development is to improve the accuracy of resource assignment, as well as further design of bellows expansion joints with increased low-cycle and high-cycle fatigue strength. The methodology combines traditional design work and the use of the software package of the Unified Computer System "Gradient". The package contains a procedure for verifying the limitations of the formula for calculating the surface area of the corrugation, its volume and corrugation sweep. The algorithm for calculating the longevity of the compensator consists of two parts: the first one contains the calculation of the compensator for fatigue with axial and transverse displacements without taking into account the internal pressure, the second one - the calculation of the compensator for fatigue taking into account the increased internal pressure. The durability of the compensator is determined by the magnitude of the voltage swing. The package allows the calculation of voltage parameters for single-layer and multi-layer (two-layer) corrugated shells, depending on the movements and internal pressure. Analysis of the stress state under given operating conditions is the basis for optimizing the design parameters of bellows expansion joints. The first contains the calculation of the compensator for fatigue in axial and transverse movements; the second is the calculation of the compensator for fatigue under pressure. The durability of the compensator is determined by the magnitude of the intensity of the voltage. The package allows you to calculate the parameters of the upper and lower shells, the voltage in the compensator corrugations for the upper and lower shells from displacements and internal pressure.