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A regression model of fatigue crack propagation under flight simulation loading

✍ Scribed by R. Sunder

Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
499 KB
Volume
12
Category
Article
ISSN
0013-7944

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✦ Synopsis

A multi-variable regression analysis is made of crack propagation data under flight simulation loading for the 2024-T3 and 7075-T6 alloys. The study is made using an equivalent effective stress range concept based on crack closure considerations. A two-variable regression model of the equivalent stress range is suggested. The model is used to calculate fatigue crack propagation lives. Predictions using the proposed model are compared with empirical results. It is shown that the model accounts for the influence of maximum, minimum and mean stress lev.els of the load spectrum. a du/dN GTAC kl, k2

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