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Modelling and measurement of crack closure and crack growth following overloads and underloadsIgnoring crack growth retardation following overloads can result in overly conservative life predictions in structures subjected to variable amplitude fatigue loading. Crack closure is believed to contribute to the crack growth retardation, although the specific closure mechanism is dabatable. The delay period and corresponding crack growth rate transients following overload and overload/underload cycles were systematically measured as a function of load ratio and overload magnitude. These responses are correlated in terms of the local 'driving force' for crack growth, i.e. the effective stress intensity factor range. Experimental results are compared with the predictions of a Dugdale-type (1960) crack closure model, and improvements in the model are suggested.
Document ID
19890062368
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dexter, R. J.
(Southwest Research Inst. San Antonio, TX, United States)
Hudak, S. J.
(Southwest Research Inst. San Antonio, TX, United States)
Davidson, D. L.
(Southwest Research Institute San Antonio, TX, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Engineering Fracture Mechanics
Volume: 33
Issue: 6 19
ISSN: 0013-7944
Subject Category
Structural Mechanics
Accession Number
89A49739
Funding Number(s)
CONTRACT_GRANT: NAS1-17641
Distribution Limits
Public
Copyright
Other

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