Abstract
Understanding the potential for supporting the maximum loading conditions in the system is a key feature in the design and analysis of pressure vessel applications. This is especially important for thin-walled pressure vessels, when stresses even reaching the initial material yield point could lead to very dangerous situations. Pressure vessels may be subjected to stresses arising from a variety of loading conditions including internal pressure and multiple external loads from attached piping systems. Once the yield point has been exceeded, the structure can accommodate more loading until the plastic zone becomes excessive leading to plastic collapse. This can be challenging to establish especially when external loads act in tandem with internal pressure. Therefore, this paper develops a finite element method for the limit load analysis of a single-nozzle cylindrical pressure vessel under internal pressure and external loading in a variety of combinations. Thereafter, a parametric study is presented covering various loading conditions, both singly and in combination. Finally, a comparison is made shown the interaction effects of the effects on the limit load for changes in vessel geometry and appropriate conclusions drawn.
Highlights
Cylindrical structures with transverse openings are often used in pressure vessel technology
In this study, a finite element approach is used to develop a suitable model and undertake a parametric limit loads study for cylinder - cylinder intersections subject to internal pressure and combinations of external loads which will lead to an improved design approach
Internal pressure and external loading conditions are the variables to be used in the studies
Summary
Cylindrical structures with transverse openings are often used in pressure vessel technology. Local stresses occur especially in these intersection regions due to external loads and internal pressure. Sang et al [3], attempted to obtain the results of inelastic stress analysis of a pressure vessel and nozzle connection with radius ratios of 0.526 (d/D = 0.526). The analyses were supported by experimental studies to demonstrate limit loads originating from internal pressure and to compare with the results of the FEM.
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