TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Life Prediction for Complex Structures

[+] Author and Article Information
S. C. Forth

United Technologies Research Center, NASA Langley Research Center, MS 188E, Two West Reid Street, Hampton, VA 23682

B. S. Annigeri

United Technologies Research Center, MS 129-73, 411 Silver Lane, East Hartford, CT 06108

W. D. Keat

Mechanical Engineering Department, Union College, Steinmetz Hall, Schenectady, NY 12308

J. Eng. Gas Turbines Power 127(4), 814-819 (Sep 20, 2005) (6 pages) doi:10.1115/1.1448330 History: Received November 01, 1999; Revised February 01, 2000; Online September 20, 2005
Copyright © 2005 by ASME
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Advancement of the fracture surface
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Mode I stress intensity factor versus crack length for a through crack in a thick plate (W/t=8.0)
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Curved surface crack (geometry I)
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Curved surface crack (geometry II)
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Effect of changes in curvature on stress intensity factors for geometry I
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Effect of changes in curvature on stress intensity factors for geometry II
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Comparison of surface integral model results to experimental data for 60 deg angled surface crack subject to cyclic tension loading. Graph (above) shows number of cycles plotted against crack half-length, c, at the free surface where c is measured perpendicular to the direction of the load. Photograph (above right) of precrack with growth rings is consistent with resulting crack mesh (below right).
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Comparison of surface integral model results to field data for a part undergoing spectrum loading. Graph above shows number of spectrum hours versus crack depth. Photograph (above right) of growth rings corresponds to cross section indicated on part insert. Succession of crack fronts predicted by the model is also shown (below right).



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