Kinetics of small fatigue cracks in steel during cyclic loading

The kinetics of development of fatigue microcracks in a high-strength 08Kh14AN4MD steel is studied when a cantilever specimen with several notches is subjected to rotational bending tests. The specific feature of the tests consists in the fact that, when the specimen is loaded at a constant load, di...

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Veröffentlicht in:Russian metallurgy Metally 2006-10, Vol.2006 (5), p.458-466
Hauptverfasser: Dronov, V. S., Botvina, L. R., Blinov, V. M., Tyutin, M. R., Afanas’ev, I. A.
Format: Artikel
Sprache:eng
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Zusammenfassung:The kinetics of development of fatigue microcracks in a high-strength 08Kh14AN4MD steel is studied when a cantilever specimen with several notches is subjected to rotational bending tests. The specific feature of the tests consists in the fact that, when the specimen is loaded at a constant load, different stress amplitudes are realized in different notches. As a result, after the sample has failed across the section with the maximum stress, a longitudinal polished section of the specimen contains fatigue cracks having nucleated in the mouths of the other notches at lower stress amplitudes. A relation between inflection points in the fatigue curve and the conditions of local and developed yield in a notch has been established. Fatigue fracture mechanisms at a superhigh number of loading cycles are studied, and their relation to the structure near a crack is found. A rapid method for estimating the fatigue limit at a superhigh number of loading cycles is proposed.[PUBLICATION ABSTRACT]
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S0036029506050144