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Fatigue crack growth with single overload - Measurement and modelingThis paper compares experiments with an analytical model of fatigue crack growth under variable amplitude. The stereoimaging technique was used to measure displacements near the tips of fatigue cracks undergoing simple variations in load amplitude-single overloads and overload/underload combinations. Measured displacements were used to compute strains, and stresses were determined from the strains. Local values of crack driving force (Delta-K effective) were determined using both locally measured opening loads and crack tip opening displacements. Experimental results were compared with simulations made for the same load variation conditions using Newman's FAST-2 model. Residual stresses caused by overloads, crack opening loads, and growth retardation periods were compared.
Document ID
19880064505
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Davidson, D. L.
(Southwest Research Inst. San Antonio, TX, United States)
Hudak, S. J., Jr.
(Southwest Research Inst. San Antonio, TX, United States)
Dexter, R. J.
(Southwest Research Institute San Antonio, TX, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Structural Mechanics
Accession Number
88A51732
Funding Number(s)
CONTRACT_GRANT: NAS1-17641
Distribution Limits
Public
Copyright
Other

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