Structures can fail prematurely and potentially suddenly when the stress state is in triaxial tension. Triaxial stresses commonly occur in notches, crack tips and thread roots. Yielding criteria such as Tresca and von Mises are based on the difference in the principal stresses and therefore reduce as the three principal stresses become more equal in magnitude. Therefore, structures need to be analyzed for failure due to triaxial stress state when conducting a plastic collapse study. One of the requirements of the ASME Section VIII Divisions 2 and 3, Design by Analysis approach is to check for the local failure of the component due to triaxial stress. Based on the ASME approach, local failure is analyzed by calculating the allowable total equivalent strain and summing the plastic strain history through a damage accumulation function. In this paper, two common HPHT subsea tree components, a gate valve body and a load bearing shoulder are analyzed for ASME local failure criteria.
- Pressure Vessels and Piping Division
Local Failure Analysis of HPHT Subsea Tree Components due to Triaxial Stress
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Karpanan, K, & Thomas, W. "Local Failure Analysis of HPHT Subsea Tree Components due to Triaxial Stress." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 5: High-Pressure Technology; ASME NDE Division; 22nd Scavuzzo Student Paper Symposium and Competition. Anaheim, California, USA. July 20–24, 2014. V005T05A009. ASME. https://doi.org/10.1115/PVP2014-28722
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