Abstract
<p>This paper presents current calculation methods in order to determine the state of stress in the nozzle – shell junction section, their peculiarities, and limitations. These can be applied only to the linear-elastic behavior of the materials components. In the case of nonlinear behavior, beyond the yield stress limit, there is proposed a calculation method based on the concept of specific energy participation.</p>
Highlights
The pressure vessels are equipped with nozzles that usually connect removable pipes, various types of fittings and other components and their devices [1]
The paper has analyzed the effect of the nozzle - shell intersection to the state of stresses, starting with the works of Bijlaard
It presents the calculation particularities of stresses in the intersection area as they are stated in the Welding Research Council Bulletin 107 and 297 and the ASME Code, Section VIII, British Standard PD - 5500 and EN 13445-3
Summary
The pressure vessels are equipped with nozzles that usually connect removable pipes, various types of fittings and other components and their devices [1]. From the point of view of the position to the reference surface (median, outer etc.) of the vessel type structure (geometric criterion), the nozzles can be: - perpendicular or radial, when their geometrical axis is identified with the normal to the nominated surface, Since all current methods refer only to the state of stress in the linear –elastic field, the paper goes on to propose a calculation method applicable to the non-linear field, beyond the yield stress. To this end, we resort to the principle of critical energy, and we use the specific energy participation concept [13 - 15]
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