Fatigue crack growth was numerically simulated for various internal surface cracks with initially either semi-elliptical or irregular crack fronts. The simulation was directly based on a series of three-dimensional finite element analyses from which the stress intensity factors along the front of growing cracks were estimated. The fatigue crack growth law obtained from small laboratory specimens was incrementally integrated at a set of points along the crack front, and a new crack front was then re-established according to the local advances at this set of points by using a cubic spline curve. This method enabled the crack shape to be predicted without having to make the usual assumption of semi-elliptical shape. Fatigue analysis results are presented and discussed for fatigue shape developments and deviations from the semi-elliptical shape, aspect ratio changes, stress intensity factor variations during crack growth, and fatigue life predictions. Some of the results were also compared with those obtained by two simplified methods based on one and two degree-of-freedom models, respectively.
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February 1998
Research Papers
Fatigue Growth Prediction of Internal Surface Cracks in Pressure Vessels
X. B. Lin,
X. B. Lin
nCode International Limited, 230 Woodbourn Road, Sheffield S9 3LQ, UK
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R. A. Smith
R. A. Smith
Department of Mechanical Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3DF, UK
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X. B. Lin
nCode International Limited, 230 Woodbourn Road, Sheffield S9 3LQ, UK
R. A. Smith
Department of Mechanical Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3DF, UK
J. Pressure Vessel Technol. Feb 1998, 120(1): 17-23 (7 pages)
Published Online: February 1, 1998
Article history
Revised:
December 3, 1996
Received:
August 25, 1997
Online:
February 11, 2008
Citation
Lin, X. B., and Smith, R. A. (February 1, 1998). "Fatigue Growth Prediction of Internal Surface Cracks in Pressure Vessels." ASME. J. Pressure Vessel Technol. February 1998; 120(1): 17–23. https://doi.org/10.1115/1.2841878
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