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.
Yield Pressure Measurements and Analysis for Autofrettaged Cannons
Contributed by the Pressure Vessels and Piping Division and presented at the Pressure Vessels and Piping Conference, Vancouver, Canada, August 4–8, 2002, of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS. Manuscript received by the PVP Division, January 30, 2002; revised manuscript received October 2, 2002. Associate Editor: J. Pan.
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Underwood, J. H., Moak , D. B., Audino, M. J., and Parker, A. P. (January 31, 2003). "Yield Pressure Measurements and Analysis for Autofrettaged Cannons ." ASME. J. Pressure Vessel Technol. February 2003; 125(1): 7–10. https://doi.org/10.1115/1.1526857
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