The surface integral method, an indirect boundary element method that represents a crack as a distribution of force dipoles, has been developed to model three-dimensional nonplanar crack growth in complex structures. The finite body was effectively modeled by superposition of stress influence functions for a half-space. As a result of this strategy, only the fracture has to be discretized. Crack propagation was modeled using the maximum circumferential stress theory to predict crack direction and the Forman fatigue equation, modified with an equivalent stress intensity solution for mixed-mode, to predict extension. Comparisons with benchmark solutions and field data verified the computational methodology and defined the limits of its applicability.
Life Prediction for Complex Structures
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Munich, Germany, May 8–11, 2000; Paper 00-GT-630. Manuscript received by IGTI November 1999; final revision received by ASME Headquarters February 2000. Associate Editor: D. Wisler.
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Forth, S. C., Annigeri, B. S., and Keat, W. D. (September 20, 2005). "Life Prediction for Complex Structures ." ASME. J. Eng. Gas Turbines Power. October 2005; 127(4): 814–819. https://doi.org/10.1115/1.1448330
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