and stress intensity factors (SIF) for three-dimensional semi-elliptical, surface, radial cracks prevailing in a pressurized or autofrettaged thick-walled cylinder were evaluated and discussed in Part I of this paper and in Perl et al. 1996, “Three-Dimensional Interaction Effects in an Internally Multicracked Pressurized Thick-Walled Cylinder—Part I: Radial Surface Cracks,” AMSE J. Pressure Vessel Technol. 118, pp. 357–363), respectively. These SIFs were calculated for a wide range of configurations: for cracks pertaining to large arrays of up to 180 cracks, with ellipticities of 0.5, 1, 1.5, depth ratios of and for various levels of autofrettage. In Part II of this paper, the effect of the combined SIF is considered, which enables the prediction of fracture endurance, crack growth rate, and the total fatigue life for a modern gun barrel. The results reconfirm the impact autofrettage has on delaying crack initiation and propagation. This favorable effect is found to be governed by —the ratio of the vessel’s material yield stress to its internal pressure. The higher ψ is, the more effective autofrettage becomes. While and reach their maximum absolute values, usually, for an array of cracks, the largest combined SIF- occurs for arrays of 2–16 cracks. Finally, the similarity in the behavior of and along the crack front is studied as well as its relation to the respective stress fields.
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February 2001
Technical Papers
3-D Stress Intensity Factors for Internal Cracks in an Overstrained Cylindrical Pressure Vessel—Part II: The Combined Effect of Pressure and Autofrettage
M. Perl, Professor, Mem. ASME,
M. Perl, Professor, Mem. ASME
Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer-Sheva 84105, Israel
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A. Nachum, Graduate Student
A. Nachum, Graduate Student
Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer-Sheva 84105, Israel
Search for other works by this author on:
M. Perl, Professor, Mem. ASME
Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer-Sheva 84105, Israel
A. Nachum, Graduate Student
Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben Gurion University of the Negev, Beer-Sheva 84105, Israel
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division, November 10, 1998; revised manuscript received July 21, 2000. Associate Technical Editor: S. Mirza.
J. Pressure Vessel Technol. Feb 2001, 123(1): 135-138 (4 pages)
Published Online: July 21, 2000
Article history
Received:
November 10, 1998
Revised:
July 21, 2000
Citation
Perl, M., and Nachum, A. (July 21, 2000). "3-D Stress Intensity Factors for Internal Cracks in an Overstrained Cylindrical Pressure Vessel—Part II: The Combined Effect of Pressure and Autofrettage ." ASME. J. Pressure Vessel Technol. February 2001; 123(1): 135–138. https://doi.org/10.1115/1.1310163
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