Kinetics of defect accumulation and duality of the weller curve in gigacycle fatigue of metals

We propose a model describing the kinetics of accumulation of defects under cyclic loading in metals. Analysis of experimental data on the initial defect distribution and of the role of the free surface of the sample in straining makes it possible to explain the features of generation of fatigue cra...

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Bibliographic Details
Published in:Technical physics 2014-03, Vol.59 (3), p.398-401
Main Authors: Naimark, O. B., Plekhov, O. A., Betekhtin, V. I., Kadomtsev, A. G., Narykova, M. V.
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Fatigue
Fatigue testing machines
Materials
Physics
Physics and Astronomy
Solid State
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Summary:We propose a model describing the kinetics of accumulation of defects under cyclic loading in metals. Analysis of experimental data on the initial defect distribution and of the role of the free surface of the sample in straining makes it possible to explain the features of generation of fatigue cracks in the bulk, which is typical of the gigacycle fatigue regime at a low stress level. The duality of the Weller curve in the gigacycle fatigue regime is attributed to the emergence of a fine-grain region in the form of a dissipative peaking structure in the defect ensemble.
ISSN:1063-7842
1090-6525
DOI:10.1134/S1063784214030190