A synergistic fracture mechanics approach to fatigue life evaluation |
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Authors: | BJ Schwartz CG Annis |
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Affiliation: | Pratt & Whitney Aircraft, Government Products Division, Mechanics of Materials and Structures, P.O. Box 2691, West Palm Beach, FL 33402, U.S.A. |
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Abstract: | A technique for modeling synergistic effects in fatigue crack propagation (FCP) is presented. First, a mission (load/temperature history) is segregated into elemental damage events. A simple three parameter model is then used to describe these events. The model coefficients are seen to be interrelated linear functions of FCP rate controlling variables such as frequency, temperature, stress ratio (σmin/σmax), dwell, overload ratio (/) and cycles between overload. Finally, integrating event-by-event crack advance gives the expected component crack propagation life under mission cycling. Results of this procedure applied to gas turbine disk materials IN100 and Waspaloy are discussed to examine the accuracy of the model. |
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