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
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Underwood, JH, Moak, DB, Audino, MA, & Parker, AP. "Yield Pressure Measurements and Analysis for Autofrettaged Cannons." Proceedings of the ASME 2002 Pressure Vessels and Piping Conference. High Pressure Technology. Vancouver, BC, Canada. August 5–9, 2002. pp. 41-45. ASME. https://doi.org/10.1115/PVP2002-1164
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