A hybrid method is presented which permits calculation of residual stresses in a swage autofrettaged tube including Bauschinger effect. The results are generally supported by three types of available experimental evidence by comparing “equivalent” swage and hydraulic autofrettage tubes having the same level of overstrain. Radial slitting of the swaged tube is predicted to show a greater opening angle than its hydraulic equivalent. Fatigue lifetime of the swaged tube is predicted to be significantly higher than the hydraulic case. Re-pressurization of the equivalent tubes is predicted to produce initial re-yielding at the same pressure in both cases. Analysis of results shows that permanent strains in the swaged tube are expected to appear at a pressure level below that for the hydraulic tube.
Hydraulic Versus Swage Autofrettage and Implications of the Bauschinger Effect
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division November 3, 2001; revision received May 6, 2003. Associate Editor: M. Perl.
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Parker, A. P., O’Hara, G. P., and Underwood , J. H. (August 1, 2003). "Hydraulic Versus Swage Autofrettage and Implications of the Bauschinger Effect ." ASME. J. Pressure Vessel Technol. August 2003; 125(3): 309–314. https://doi.org/10.1115/1.1593079
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