Autofrettage is the process to introduce favorable residual compressive hoop stresses on the bore of a pressurized cylinder to enhance its strength and durability. For certain type of pressurized vessels under certain severe operating conditions, erosions and cracks often occur causing significant reduction in pressure vessel fatigue life. Those erosions and cracks are in general 3D geometrical configurations. The Stress Intensity Factors (SIFs) of the cracks are often the key to estimate the fatigue life. However the SIFs are largely dependent on not only the crack geometrical configurations but also the geometrical configurations of the erosions introduced during its operation. The Bauschinger effect on the SIFs further complicates the analysis. In this study, a closer look is taken at how a finite axial erosion in combination with the Bauschinger modified autofrettage properties affect the 3D SIFs. The problem is solved via the finite element method (FEM). The SIFs are evaluated for a variety of relative crack depth, different crack configurations and erosion geometrical configurations including arc erosion, semi-circular and semi-elliptical erosions. We show that the effective SIFs can be increased significantly by any of these factors but the combined effect often worsens the situation.
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ASME 2014 Pressure Vessels and Piping Conference
July 20–24, 2014
Anaheim, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4600-1
PROCEEDINGS PAPER
The Combined Effect of a Finite Axial Erosion With Bauschinger Modified Autofrettage on the 3D SIFs of Pressurized Cylinders
C. Levy,
C. Levy
Florida International University, Miami, FL
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M. Perl
M. Perl
Ben Gurion University of the Negev, Beer Shava, Israel
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Q. Ma
Walla Walla University, College Place, WA
C. Levy
Florida International University, Miami, FL
M. Perl
Ben Gurion University of the Negev, Beer Shava, Israel
Paper No:
PVP2014-28033, V003T03A078; 9 pages
Published Online:
November 18, 2014
Citation
Ma, Q, Levy, C, & Perl, M. "The Combined Effect of a Finite Axial Erosion With Bauschinger Modified Autofrettage on the 3D SIFs of Pressurized Cylinders." Proceedings of the ASME 2014 Pressure Vessels and Piping Conference. Volume 3: Design and Analysis. Anaheim, California, USA. July 20–24, 2014. V003T03A078. ASME. https://doi.org/10.1115/PVP2014-28033
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