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Development of a Practical Methodology for Elastic-Plastic and Fully Plastic Fatigue Crack GrowthA practical engineering methodology has been developed to analyze and predict fatigue crack growth rates under elastic-plastic and fully plastic conditions. The methodology employs the closure-corrected effective range of the J-integral, (Delta)J(sub eff), as the governing parameter. The methodology contains original and literature J and (Delta)J solutions for specific geometries, along with general methods for estimating J for other geometries and other loading conditions, including combined mechanical loading and combined primary and secondary loading. The methodology also contains specific practical algorithms that translate a J solution into a prediction of fatigue crack growth rate or life, including methods for determining crack opening levels, crack instability conditions, and material properties. A critical core subset of the J solutions and the practical algorithms has been implemented into independent elastic-plastic NASGRO modules. All components of the entire methodology, including the NASGRO modules, have been verified through analysis and experiment, and limits of applicability have been identified.
Document ID
19990069532
Acquisition Source
Marshall Space Flight Center
Document Type
Contractor Report (CR)
Authors
McClung, R. C.
(Southwest Research Inst. San Antonio, TX United States)
Chell, G. G.
(Southwest Research Inst. San Antonio, TX United States)
Lee, Y.-D.
(Southwest Research Inst. San Antonio, TX United States)
Russell, D. A.
(Boeing North American, Inc. Canoga Park, CA United States)
Orient, G. E.
(Boeing North American, Inc. Canoga Park, CA United States)
Date Acquired
August 19, 2013
Publication Date
July 1, 1999
Subject Category
Structural Mechanics
Report/Patent Number
NASA/CR-1999-209428
M-933
NAS 1.26:209428
Funding Number(s)
CONTRACT_GRANT: NAS8-37828
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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