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A study of spectrum fatigue crack propagation in two aluminum alloys. I - Spectrum simplification. II - Influence of microstructuresAn investigation of the fatigue crack propagation FCP behavior of two aluminum alloys is performed to simulate spectrum loading conditions found at critical locations in high performance fighter aircraft. Negative loads are shown to be eliminated for the tension-compression spectrum for low to intermediate maximum stress intensities, and load interactions are found to be more significant at higher stress intensities and with more plasticity at the crack tip. In the second part, the influence of microstructural features including grain size, inclusions, and dispersoids on constant amplitude and spectrum crack growth behavior in aluminum alloys is studied. At low stress intensities the I/M alloy demonstrated better FCP resistance than the P/M 7091 alloy for both constant amplitude and spectrum testing, and the inhomogeneous planar slip and large grain size of 7050 limit dislocation interactions, thereby improving FCP performance.
Document ID
19860064235
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Telesman, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Antolovich, S. D.
(Georgia Institute of Technology Atlanta, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Engineering Fracture Mechanics
Volume: 24
Issue: 3, 19
ISSN: 0013-7944
Subject Category
Metallic Materials
Accession Number
86A48973
Distribution Limits
Public
Copyright
Other

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