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Probabilistic Analysis of Cracking Phenomenon in a Mixing Tee Under Thermal Fatigue

[+] Author Affiliations
Igor Varfolomeyev

Fraunhofer Institute for Mechanics of Materials, Freiberg, Germany

Paper No. PVP2007-26538, pp. 99-106; 8 pages
doi:10.1115/PVP2007-26538
From:
  • ASME 2007 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications and Components
  • San Antonio, Texas, USA, July 22–26, 2007
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4285-1 | eISBN: 0-7918-3804-8
  • Copyright © 2007 by ASME

abstract

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.

Copyright © 2007 by ASME

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