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Relationship between fatigue life in the creep-fatigue region and stress-strain response

Author
Nadiv, S.
Published
JAN 1, 1988.
Physical Description
1 electronic document
Additional Creators
Berkovits, A.
Online Version

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Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary
On the basis of mechanical tests and metallographic studies, strainrange partitioned lives were predicted by introducing stress-strain materials parameters into the Universal Slopes Equation. This was the result of correlating fatigue damage mechanisms and deformation mechanisms operating at elevated temperatures on the basis of observed mechanical and microstructural behavior. Correlation between high temperature fatigue and stress strain properties for nickel base superalloys and stainless steel substantiated the method. Parameters which must be evaluated for PP- and CC- life are the maximum stress achievable under entirely plastic and creep conditions respectively and corresponding inelastic strains, and the elastic modulus. For plasticity/creep interaction conditions (PC and CP) two more pairs of stress strain parameters must be ascertained.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19880008656.
Accession ID: 88N18040.
NAS 1.15:100796.
NASA-TM-100796.
E-3972.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15695563