Kinetics of Defect Accumulation and Duality of the Weller Curve
in Gigacycle Fatigue of Metals

O. B. Naimark^a, O. A. Plekhov^a*, V. I. Betekhtin^b, A. G. Kadomtsev^b, and M. V. Narykova^b

^a Institute of Continuous Media Mechanics, Ural Branch, Russian Academy of Sciences,
ul. Akademika Koroleva 1, Perm, 614013 Russia
^b Ioffe Physical Technical Institute, Russian Academy of Sciences,
ul. Politekhnicheskaya 26, St. Petersburg, 194021 Russia
*e-mail: poa@icmm.ru

Received May 30, 2013

Abstract—We propose a model describing the kinetics of accumulation of defects under cyclic loading in met-
als. Analysis of experimental data on the initial defect distribution and of the role of the free surface of the sam-
ple 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.

DOI: 10.1134/S1063784214030190

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