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Fatigue life and crack growth prediction methodologyThis paper reviews the capabilities of a plasticity-induced crack-closure model and life-prediction code to predict fatigue crack growth and fatigue lives of metallic materials. Crack-tip constraint factors, to account for three-dimensional effects, were selected to correlate large-crack growth rate data as a function of the effective stress-intensity factor range (Delta K(sub eff)) under constant amplitude loading. Some modifications to the Delta K(sub eff)-rate relations were needed in the near threshold regime to fit small-crackgrowth rate behavior and endurance limits. The model was then used to calculate small- and large-crack growth rates, and in some cases total fatigue lives, for several aluminum and titanium alloys under constant-amplitude, variable-amplitude, and spectrum loading. Fatigue lives were calculated using the crack-growth relations and microstructural features like those that initiated cracks. Results from the tests and analyses agreed well.
Document ID
19940030077
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Newman, J. C., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Phillips, E. P.
(NASA Langley Research Center Hampton, VA, United States)
Everett, Richard A., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1994
Publication Information
Publication: AGARD, An Assessment of Fatigue Damage and Crack Growth Prediction Techniques
Subject Category
Structural Mechanics
Accession Number
94N34583
Distribution Limits
Public
Copyright
Other
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