Abstract
An analysis has been made of the behavior of flange joint components under initial stress loading (pre-clamping) and in service. There have been highlighted the drawbacks in calculating flange joints to be found in currently acknowledged methods that do not take into account: - the influence of the bending moment produced by the total hydrostatic end force on bolt strength and flange rotation; - the presence of cracks in the welding or in its thermal influence zone; - the residual stresses; � the relaxation of the sealing gasket over time. The calculation method proposed in the paper takes into account all these particularities of loading. Furthermore, alongside the strength calculation of bolts and flanges, a proposal has been put forth for the calculation of the flange joint leak-tightness.
Highlights
An analysis has been made of the behavior of flange joint components under initial stress loading and in service
-calculate stresses in bolts; -calculate the total participation of the specific energies corresponding to the bolt loads with respect to the allowable state ( PT* ); - calculate the allowable participation for bolts (Pal);
New relationships have been proposed for calculating the strength of flange joints corresponding to actual conditions
Summary
A flange joint is first selected based on the service parameters. its components are verified. -the residual stresses, res , through residual stress participation Pres t ; -total deterioration to the assembly components, DT t. Such an approach to the calculation of strength is possible due to the use of the principle of critical energy [4-7]. The bolts undergo a tensile force and a bending moment This is a case of stress superposition to be solved on the basis of Energonics [4;7], using the principle of critical energy [4-7] and the law of equivalence of processes and phenomena [15] from Energonics. The calculation is based on the use of the concept of participation of the specific energy introduced by stress loading, in relation to the admissible state, and the admissible participation concept, both of which are nondimensional variables dependent on the behavior of the material under stress. - the total contribution of the specific energies corresponding to the stress loadings, with respect to the allowable status, PT*
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