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Method for Developing Variable Axial Loading in Thick Walled Pressure Vessels

[+] Author Affiliations
Lucas B. Smith, Philip C. Wheeler, Gregory N. Vigilante

US Army – Benét Laboratories, Watervliet, NY

Paper No. PVP2016-63990, pp. V005T05A014; 6 pages
doi:10.1115/PVP2016-63990
From:
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 24th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Electric Power Research Institute (EPRI) Creep Fatigue Workshop
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5041-1

abstract

Traditional hydraulic fatigue testing is performed on open ended cylindrical sections of pressure vessels to establish their fatigue life. Typically only hoop loading of the pressure vessels is required to determine fatigue life. However, for some specific geometries and service conditions a more complex test is required. It has been confirmed that certain geometries have experienced circumferential cracking because of combined, nearly equivalent axial loading and hoop loading. Consequently, a test fixture was engineered, designed, built and tested by US Army - Benét Laboratories / ARDEC to replicate the service loading condition. Simultaneous axial / hoop fatigue testing results in a more realistic representation of service loading conditions and a more accurate determination of fatigue life for these non-typical cases.

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