Investigation of fatigue damage accumulation in steels using the Fourier transform of the structure image

Studies of fatigue strength of steels 45 and Kh18N10T and the structure changes during cyclic loading are reported. The fatigue damage accumulation was evaluated by the statistical processing of microstructure images. The value of the ellipse eccentricity in the Fourier transform of the microstructu...

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Bibliographic Details
Published in:Strength of materials 2011-10, Vol.43 (6), p.687-693
Main Authors: Byalonovich, A. V., Matokhnyuk, L. E.
Format: Article
Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Exact sciences and technology
Fatigue
Fatigue testing machines
Fractures
Investigations
Materials
Materials Science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Solid Mechanics
Steel
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Summary:Studies of fatigue strength of steels 45 and Kh18N10T and the structure changes during cyclic loading are reported. The fatigue damage accumulation was evaluated by the statistical processing of microstructure images. The value of the ellipse eccentricity in the Fourier transform of the microstructure is used as a parameter characterizing the material state, while the damage accumulation factor, which is integral and invariant with respect to the amplitude of cyclic loading and cycle stress ratio, is used as a quantitative characteristic of changes in the material structure under cyclic loading. In the state prior to the fatigue fracture, the material damage accumulation factor attains a specific value irrespective of the stress amplitude and the cycle stress ratio, and serves as the criterion of fracture under cyclic loading.
ISSN:0039-2316
1573-9325
DOI:10.1007/s11223-011-9341-6