Pressure vessel steels exhibit the Bauschinger effect that significantly reduces post-autofrettage residual compressive hoop stresses in the near-bore region in comparison with ‘ideal’ (elastic-perfectly plastic) behavior. These reduced hoop stress profiles were calculated using Von Mises’ criterion via a non-linear analysis for the case of open-end (engineering plane strain) autofrettage. These profiles were then used to obtain stress intensity factor solutions via the Boundary Integral Equation (BIE) method, commonly known as the Boundary Element Method (BEM). Results are presented for tubes of diameter ratio 2 and 2.5 with an internal semi-elliptical surface crack having a maximum depth/surface length ratio of 0.4 (i.e. an eccentricity of 0.8). Crack depths range from 20% to 80% of wall thickness and results are presented for seven locations on the crack front from maximum depth to free surface. For crack depths up to 20% of wall thickness there is a significant reduction in magnitude of autofrettage stress intensity factor due to Bauschinger effect. For typical overstrain levels this reduction is approximately 30% of ‘ideal’ values. Such a reduction may, in turn, cause an order of magnitude reduction in the fatigue lifetime of the vessel.
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ASME 2003 Pressure Vessels and Piping Conference
July 20–24, 2003
Cleveland, Ohio, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-1696-6
PROCEEDINGS PAPER
Stress Intensity Factors for a Curved-Front Internal Crack in an Autofrettaged Tube With Bauschinger Effect
Choon-Lai Tan,
Choon-Lai Tan
Carleton University, Ottawa, ON, Canada
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Anthony P. Parker,
Anthony P. Parker
Cranfield University, Swindon, UK
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Chantz W. V. Cassell
Chantz W. V. Cassell
Carleton University, Ottawa, ON, Canada
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Choon-Lai Tan
Carleton University, Ottawa, ON, Canada
Anthony P. Parker
Cranfield University, Swindon, UK
Chantz W. V. Cassell
Carleton University, Ottawa, ON, Canada
Paper No:
PVP2003-1835, pp. 29-34; 6 pages
Published Online:
August 13, 2008
Citation
Tan, C, Parker, AP, & Cassell, CWV. "Stress Intensity Factors for a Curved-Front Internal Crack in an Autofrettaged Tube With Bauschinger Effect." Proceedings of the ASME 2003 Pressure Vessels and Piping Conference. High Pressure Technology: Shaping High Pressure Technology for the Future. Cleveland, Ohio, USA. July 20–24, 2003. pp. 29-34. ASME. https://doi.org/10.1115/PVP2003-1835
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