The paper provides a feasibility study of crack initiation and propagation in a mixing zone of an austenitic piping subjected to thermal fatigue loading. The analysis employs input data generated within the European research project THERFAT. A deterministic analysis performed using conservatively selected boundary conditions revealed high stresses in a mixing tee giving rise to fatigue damage. To account for the uncertainties, scatter and randomness of the thermal-hydraulic data and material properties, statistical data treatment and probabilistic methods are applied. Experimental measurements of temperature fluctuations obtained on austenitic thin-walled models are first employed to estimate the heat transfer coefficient. Then temperature and stress calculations are performed for a realistic piping geometry, and time to crack initiation is evaluated based on the fatigue design curves. The derived distribution function for the component life-time is compared with a deterministic assessment obtained using conservative assumptions on heat transfer conditions and material data. A possibility of crack propagation into the pipe wall is analyzed.
Probabilistic Analysis of Cracking Phenomenon in a Mixing Tee Under Thermal Fatigue
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Varfolomeyev, I. "Probabilistic Analysis of Cracking Phenomenon in a Mixing Tee Under Thermal Fatigue." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 7: Operations, Applications and Components. San Antonio, Texas, USA. July 22–26, 2007. pp. 99-106. ASME. https://doi.org/10.1115/PVP2007-26538
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