Hydraulic Versus Swage Autofrettage and Implications of the Bauschinger Effect

[+] Author and Article Information
A. P. Parker

Engineering Systems Department, Royal Military College of Science, Cranfield University, Swindon, SN8 6LA, England

G. P. O’Hara, J. H. Underwood

US Army Armament Research, Development and Engineering Center, Benét Laboratories, Watervliet, NY 12189

J. Pressure Vessel Technol 125(3), 309-314 (Aug 01, 2003) (6 pages) doi:10.1115/1.1593079 History: Received November 03, 2001; Revised May 06, 2003; Online August 01, 2003
Copyright © 2003 by ASME
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Residual stresses in swage autofrettaged tube, b/a=2.79 (finite element solution without Bauschinger effect). Ideal Tresca solution shows only the near-bore analytic solution, Eq. (1), with β=1, to illustrate bound.
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Schematic of uniaxial (equivalent stress) behavior, stress, strain, and Bauschinger effect factor (BEF). A-B-C-D-E represent initial autofrettage pressurization and de-pressurization. E-F-B represent re-pressurization.
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Similarity of near-bore re-yielding post “Saturation” due to Bauschinger effect. Basic configuration, b/a=2.79, further configuration b/a=4.58.
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Summary of hoop residual stresses in autofrettaged tube, b/a=2.79
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Von Mises stress states at various re-pressurization levels, b/a=2.79




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