Crack growth under variable amplitude and spectrum loading in 2024-T3 aluminum alloys
- NASA Langley Research Center, Hampton, VA (United States). Mechanics of Materials Branch
This paper is dedicated to Professor Paul C. Paris and is concerned with the application of a plasticity-induced crack closure model to study fatigue crack growth under various load histories. The model is based on the Dugdale model but accounts for constraint effects (plane-strain to plane-stress transition) on crack growth behavior. The model was used to correlate crack growth rate data under constant-amplitude loading and was then used to predict crack growth under variable-amplitude and spectrum loading on several thin-sheet 2024-T3 aluminum alloys. Crack-opening stresses from the model agreed fairly well with test measurements from the literature. Crack-growth lives agreed within a factor of two for spike overload-underload tests and for two different wing load spectra. Some of the differences were attributed to fretting-product-debris-induced closure and three-dimensional effects not included in the model.
- OSTI ID:
- 293060
- Report Number(s):
- CONF-970980--; ISBN 0-87339-382-1
- Country of Publication:
- United States
- Language:
- English
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