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The relationship between observed fatigue damage and life estimation models

Author
Socie, Darrell F.
Published
Aug 1, 1988.
Physical Description
1 electronic document
Additional Creators
Kurath, Peter
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
Observations 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.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19880018227.
Accession ID: 88N27611.
NASA-CR-182191.
NAS 1.26:182191.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15694042