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Creep, Fatigue and Environmental Interactions and Their Effect on Crack Growth in SuperalloysComplex interactions of creep/fatigue/environment control dwell fatigue crack growth (DFCG) in superalloys. Crack tip stress relaxation during dwells significantly changes the crack driving force and influence DFCG. Linear Elastic Fracture Mechanics, Kmax, parameter unsuitable for correlating DFCG behavior due to extensive visco-plastic deformation. Magnitude of remaining crack tip axial stresses controls DFCG resistance due to the brittle-intergranular nature of the crack growth process. Proposed a new empirical parameter, Ksrf, which incorporates visco-plastic evolution of the magnitude of remaining crack tip stresses. Previous work performed at 704C, extend the work to 760C.
Document ID
20170004396
Acquisition Source
Glenn Research Center
Document Type
Presentation
Authors
Telesman, J. (NASA Glenn Research Center Cleveland, OH United States)
Gabb, T. P. (NASA Glenn Research Center Cleveland, OH United States)
Ghosn, L. J. (NASA Glenn Research Center Cleveland, OH United States)
Smith, T. (NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
May 5, 2017
Publication Date
March 1, 2017
Subject Category
Metals And Metallic Materials
Structural Mechanics
Report/Patent Number
GRC-E-DAA-TN39500
Report Number: GRC-E-DAA-TN39500
Meeting Information
Meeting: TMS 2017 Annual Conference
Location: San Diego, CA
Country: United States
Start Date: February 2, 2017
End Date: March 2, 2017
Sponsors: Minerals, Metals and Materials Society
Funding Number(s)
WBS: WBS 081876.02.03.04.02.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
environmental interactions
crack growth
Superalloys

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