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Yield Pressure Measurements and Analysis for Autofrettaged Cannons

[+] Author Affiliations
John H. Underwood, David B. Moak, Michael A. Audino

Benet Laboratories, Watervliet, NY

Anthony P. Parker

Cranfield University, Swindon, UK

Paper No. PVP2002-1164, pp. 41-45; 5 pages
doi:10.1115/PVP2002-1164
From:
  • ASME 2002 Pressure Vessels and Piping Conference
  • High Pressure Technology
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1947-7
  • Copyright © 2002 by ASME

abstract

Yield pressure corresponding to a small permanent OD strain was measured in quasi-static laboratory tests of autofrettaged ASTM A723 steel cannon pressure vessels. Yield pressure was found to be a consistent ratio of the yield strength measured from specimens located in close proximity to the area of observed yielding. Yield pressure measurements for dynamic cannon firing with typically a 5 ms pressure pulse duration gave 14% higher yield pressures, attributed to strain rate effects on plastic deformation. Calculated Von Mises yield pressure for the laboratory test conditions, including the Bauschinger-modified ID residual stress and open-end vessel conditions, agreed with measured yield pressure within 3–5%. Calculated yield pressure was found to be insensitive to the value of axial residual stress, since axial stress is the intermediate value in the Von Mises yield criterion. A description of yield pressure normalized by yield strength was given for autofrettaged A723 open-end pressure vessels over a range of wall ratio and degree of autofrettage, including effects of Bauschinger-modified residual stress. This description of yield pressure is proposed as a design procedure for cannons and other pressure vessels.

Copyright © 2002 by ASME

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