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An inverse method for the calculation of through-thickness fatigue crack closure behaviorAn inverse technique was used to calculate through-thickness fatigue crack closure behavior. The through-thickness variation in crack opening stress-intensity factor was calculated by considering the variation in the three-dimensional stress-intensity factor, the variation in crack growth rate along the crack front, and a relationship between the crack growth rate and effective stress-intensity factor range (da/dN-Delta-K(eff)). The three-dimensional stress-intensity factor variation was obtained from an elastic finite element analysis of specific crack-front profiles observed experimentally. The variation in crack growth rate along the crack front was obtained experimentally from comparison of observed crack front changes. The da/dN-Delta-K(eff) relationship was estimated from high stress ratio, constant load amplitude, and fatigue crack growth tests. The through-thickness crack opening stress-intensity factor results agreed with crack opening measurements obtained from fatigue striations, near-tip strain gages, and remote strain and displacement gages.
Document ID
19930047606
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Dawicke, D. S.
(Purdue Univ. West Lafayette, IN; Analytical Services and Materials, Inc., Hampton, VA, United States)
Shivakumar, K. N.
(Analytical Services and Materials, Inc. Hampton, VA, United States)
Newman, J. C., Jr.
(NASA Langley Research Center Hampton, VA, United States)
Grandt, A. F., Jr.
(Purdue Univ. West Lafayette, IN, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Fracture mechanics; Proceedings of the 22nd National Symposium, Atlanta, GA, June 26-28, 1990. Vol. 2 (A93-31576 11-39)
Publisher: American Society for Testing and Materials
Subject Category
Structural Mechanics
Accession Number
93A31603
Distribution Limits
Public
Copyright
Other

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