The purpose of this paper is to present stress-intensity factors for a wide range of semi-elliptical surface cracks on the inside of pressurized cylinders. The ratio of crack depth to crack length ranged from 0.2 to 1; the ratio of crack depth to wall thickness ranged from 0.2 to 0.8; and the ratio of wall thickness to vessel radius was 0.1 to 0.25. The stress-intensity factors were calculated by a three-dimensional finite-element method. The finite-element models employ singularity elements along the crack front and linear-strain elements elsewhere. The models had about 6500 degrees of freedom. The stress-intensity factors were evaluated from a nodal-force method. An equation for the stress-intensity factors was obtained from the results of the present analysis. The equation applies over a wide range of configuration parameters and was within about 5 percent of the present results. A comparison was also made between the present results and other analyses of internal surface cracks in cylinders. The results from a boundary-integral equation method were in good agreement (± 2 percent) and those from another finite-element method were in fair agreement (± 8 percent) with the present results.
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November 1980
Research Papers
Stress-Intensity Factors for Internal Surface Cracks in Cylindrical Pressure Vessels
J. C. Newman, Jr.,
J. C. Newman, Jr.
NASA Langley Research Center, Hampton, Va. 23665
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I. S. Raju
I. S. Raju
Joint Institute for Advancement of Flight Sciences, George Washington University at Langley Research Center, Hampton, Va. 23665
Search for other works by this author on:
J. C. Newman, Jr.
NASA Langley Research Center, Hampton, Va. 23665
I. S. Raju
Joint Institute for Advancement of Flight Sciences, George Washington University at Langley Research Center, Hampton, Va. 23665
J. Pressure Vessel Technol. Nov 1980, 102(4): 342-346 (5 pages)
Published Online: November 1, 1980
Article history
Received:
February 29, 1980
Online:
November 5, 2009
Citation
Newman, J. C., Jr., and Raju, I. S. (November 1, 1980). "Stress-Intensity Factors for Internal Surface Cracks in Cylindrical Pressure Vessels." ASME. J. Pressure Vessel Technol. November 1980; 102(4): 342–346. https://doi.org/10.1115/1.3263343
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