Comparison of the low-cycle fatigue properties of heavily cold-drawn copper and Cu-20%Nb

The low-cycle fatigue characteristics of heavily cold-drawn (99% reduction of area) copper and Cu-20%Nb were evaluated for various plastic strain amplitudes. Softening occurred during fatigue cycling of both materials but neither showed steady state behavior. Plots of the fatigue life as a function...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1990, Vol.123 (1), p.69-74
Main Authors: Spitzig, W.A., Reed, L.K., Chatterjee, A.
Format: Article
Language:English
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Summary:The low-cycle fatigue characteristics of heavily cold-drawn (99% reduction of area) copper and Cu-20%Nb were evaluated for various plastic strain amplitudes. Softening occurred during fatigue cycling of both materials but neither showed steady state behavior. Plots of the fatigue life as a function of platic, elastic or total strain show that Cu-20%Nb is superior to copper in both low-cycle (plastic) and high-cycle (elastic) fatigue. The fatigue ductility exponent, fatigue stregth coefficient and cyclic strain hardening exponent in the heavily drawn copper were similar in magnitude to those observed for annealed copper and most other metals. It appears that copper shows unique cyclic stress-strain behavior regardless of its initial condition or strain history.
ISSN:0921-5093
1873-4936
DOI:10.1016/0921-5093(90)90211-K