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Fatigue damage mechanisms in boron-aluminium composite laminatesThe relationship between fatigue and shakedown in metal matrix composites is investigated theoretically and experimentally for unidirectional and laminated 6061 Al-B materials. It is shown that no fatigue damage takes place if the applied stress range is such that the material remains elastic, or shakes down, i.e., resumes elastic cyclic straining after a small number of plastic strain cycles. Fatigue damage occurs only in specimens subjected to stress ranges which cause sustained cyclic plastic straining in the aluminum matrix. If the applied stress range is smaller than that required for fatigue failure, after about 10 to the 6th cycles a saturation damage state is reached which remains essentially unchanged with increasing number of cycles.
Document ID
19810056173
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Dvorak, G. J.
(Utah, University Salt Lake City, UT, United States)
Johnson, W. S.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1980
Subject Category
Composite Materials
Meeting Information
Meeting: International Conference on Composite Materials
Location: Paris
Country: France
Start Date: August 26, 1980
End Date: August 29, 1980
Accession Number
81A40577
Distribution Limits
Public
Copyright
Other

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