A manufacturing procedure for enhancing residual stresses and thereby improving fatigue lifetime and fracture resistance of pressure vessels is proposed. The procedure involves initial autofrettage; one or more ‘heat soak plus autofrettage’ sequences and an optional final heat soak. Stresses are calculated numerically for traditional, single autofrettage and compared with those created by the new procedure. The loss of bore compressive hoop stress due to Bauschinger effect is predicted to be significantly reduced. Associated fatigue lifetime calculations indicate that life may be improved by a factor of between 2 and 30, depending upon tube geometry and the ratio of cyclic pressure to yield strength. Repeated overload plus heat soak cycles may also be of benefit in other engineering design scenarios.
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ASME 2005 Pressure Vessels and Piping Conference
July 17–21, 2005
Denver, Colorado, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4190-1
PROCEEDINGS PAPER
A Re-Autofrettage Procedure for Mitigation of Bauschinger Effect in Thick Cylinders Available to Purchase
Anthony P. Parker
Anthony P. Parker
University of Cranfield, Swindon, England
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Anthony P. Parker
University of Cranfield, Swindon, England
Paper No:
PVP2005-71367, pp. 61-66; 6 pages
Published Online:
July 29, 2008
Citation
Parker, AP. "A Re-Autofrettage Procedure for Mitigation of Bauschinger Effect in Thick Cylinders." Proceedings of the ASME 2005 Pressure Vessels and Piping Conference. Volume 5: High Pressure Technology, Nondestructive Evaluation, Pipeline Systems, Student Paper Competition. Denver, Colorado, USA. July 17–21, 2005. pp. 61-66. ASME. https://doi.org/10.1115/PVP2005-71367
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