Autofrettage is used to introduce advantageous residual stresses into pressure vessels. The Bauschinger effect can produce less compressive residual hoop stresses near the bore than are predicted by “ideal” autofrettage solutions. A design procedure was recently proposed which models material removal from the bore or outside diameter of a single, plain autofrettaged tube in the presence of Bauschinger effect. This paper extends the procedure to model the addition of pressure or of material (via shrink-fit) to the tube, providing associated residual stress profiles following various amounts of further yielding due to a net external pressure. Simple criteria are developed for determining, and avoiding, further yielding in the autofrettaged tube when it is used as part of a compound assembly involving shrink-fitting; these criteria are based upon net pressure differential between the bore and outside diameter of the autofrettaged tube. An alternative criterion, based upon bore hoop stress, is shown to be erroneous.

Issue Section:
Technical Papers
Keywords:
plastic flow, pressure vessels, stress effects
Topics:
Autofrettage, Design, External pressure, Hoop stress, Pressure, Stress, Pressure vessels
1.
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2.
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1.
Parker, A. P., 2001, “Autofrettage of Open-End Tubes—Pressures, Stresses, Strains and Code Comparisons,” ASME J. Pressure Vessel Technol., accepted for publication;
2.
also, presented at ASME Pressure Vessels and Piping Conference, Seattle, WA, July, ASME PVP-Vol. 406, ed. S. C. Mordre, pp. 1–18.
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ASME Pressure Vessel and Piping Design Code, 1997, “Design Using Autofrettage,” Division 3, Section 8, Article KD-5, pp. 71–73.
Copyright © 2001
 by ASME
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