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The relationship between observed fatigue damage and life estimation modelsObservations of the surface of laboratory specimens subjected to axial and torsional fatigue loadings has resulted in the identification of three damage fatigue phenomena: crack nucleation, shear crack growth, and tensile crack growth. Material, microstructure, state of stress/strain, and loading amplitude all influence which of the three types of fatigue damage occurs during a dominant fatigue life fraction. Fatigue damage maps are employed to summarize the experimental observations. Appropriate bulk stress/strain damage parameters are suggested to model fatigue damage for the dominant fatigue life fraction. Extension of the damage map concept to more complex loadings is presented.
Document ID
19880018227
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kurath, Peter
(Illinois Univ. Urbana-Champaign, IL, United States)
Socie, Darrell F.
(Illinois Univ. Urbana-Champaign, IL, United States)
Date Acquired
September 5, 2013
Publication Date
August 1, 1988
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.26:182191
NASA-CR-182191
Report Number: NAS 1.26:182191
Report Number: NASA-CR-182191
Accession Number
88N27611
Funding Number(s)
PROJECT: RTOP 505-63-1B
CONTRACT_GRANT: NAG3-465
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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