Effects of Combined Thermo-Mechanical Loading on Stress Concentration in High-Pressure Vessels with a Cross-Bore

Effects of Combined Thermo-Mechanical Loading on Stress Concentration in High-Pressure Vessels with a Cross-Bore

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© 2023 by IJETT Journal
Volume-71 Issue-12
Year of Publication : 2023
Author : Patrick Kiola Nziu
DOI : 10.14445/22315381/IJETT-V71I12P217

How to Cite?

Patrick Kiola Nziu, "Effects of Combined Thermo-Mechanical Loading on Stress Concentration in High-Pressure Vessels with a Cross-Bore," International Journal of Engineering Trends and Technology, vol. 71, no. 12, pp. 168-175, 2023. Crossref, https://doi.org/10.14445/22315381/IJETT-V71I12P217

Abstract
The purpose of this study was to determine the effects of combined thermo-mechanical loading on stress concentration factor (SCF) in cross-bored thick-walled cylinders while considering the varying temperatures. The combined thermomechanical stress analysis was performed only on the reported geometrically optimised cross bores. A total of 14 different part models were created and analysed using three-dimensional finite element modelling software. The modelling was done under transient conditions to simulate the start-up conditions of pressure vessels until steady-state conditions were reached. Throughout the analyses, the fluid pressure was assumed to be constant at 1 𝑀𝑁 m2 ⁄ . The resulting stresses were recorded at 17 different temperature distribution intervals, ranging from 20oC to 300oC according to the thickness ratio. The hoop stress due to internally applied combined thermo-mechanical loading increased gradually with an increase in temperature until it reached a maximum value, after which it began to fall sharply. In contrast, the corresponding SCF reduced gradually with an increase in temperature until it reached a uniform steady state. After which, any further increase in temperature had an insignificant change in the stress concentration factor. The optimal SCF magnitude due to combined thermo-mechanical loading was 1.43. This SCF magnitude was slightly lower due to the pressure load acting alone.

Keywords
Cross bores, Pressure vessels, Stress concentration, Thermomechanical loading.

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