Prediction of Service Life of Aircraft Structural Components Using the Half-Cycle Method
Ko, William L. (1987) Prediction of Service Life of Aircraft Structural Components Using the Half-Cycle Method. Technical Report NASA TM-86812, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
The service life of aircraft structural components undergoing random stress cycling was analyzed by the application of fracture mechanics. The initial crack sizes at the critical stress points for the fatigue-crack growth analysis were established through proof load tests. The fatigue-crack growth rates for random stress cycles were calculated using the half-cycle method. A new equation was developed for calculating the number of remaining flights for the structural components. The number of remaining flights predicted by the new equation is much lower than that predicted by the conventional equation.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Fatigue life, Fracture mechanics, Half-cycle method, Random cycling, Service life prediction |
| Subjects: | (31 - 39) Engineering: (39) Structural Mechanics |
| ID Code: | 499 |
| Deposited On: | 19 January 2006 |
| Additional Information: | 27 pages. |
