Advances in Fatigue Life Prediction Methodology for Metallic Materials
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 48 |
Release | : 2018-06-30 |
ISBN-10 | : 1722051825 |
ISBN-13 | : 9781722051822 |
Rating | : 4/5 (25 Downloads) |
Book excerpt: The capabilities of a plasticity-induced crack-closure model to predict small- and large-crack growth rates, and in some cases total fatigue life, for four aluminum alloys and three titanium alloys under constant-amplitude, variable-amplitude, and spectrum loading are described. Equations to calculate a cyclic-plastic-zone corrected effective stress-intensity factor range from a cyclic J-integral and crack-closure analysis of large cracks were reviewed. The effective stress-intensity factor range against crack growth rate relations were used in the closure model to predict small- and large-crack growth under variable-amplitude and spectrum loading. Using the closure model and microstructural features, a total fatigue life prediction method is demonstrated for three aluminum alloys under various load histories. Newman, J. C., Jr. Langley Research Center RTOP 505-63-50-04...