Influence of loading type on the shape of fatigue lifetime curve

• Autorzy: Bokuvka O. , Novy F. , Mintach R. , Cincala M.
• Języki publikacji: EN

Abstrakty

EN

The paper is devoted to an experimental examination of the influence of loading type on the shape of fatigue lifetime curve of the high-carbon-chromium bearing steel (100Cr6). The push-pull and rotating bending loading tests (R=-1) were used with the aim to obtain experimental data in the region from [...] cycles to [...] cycles. The shape of fatigue lifetime curve of 100Cr6 bearing steel depends on the loading type. The S-N curve obtained using rotating bending consists of two parts corresponding to surface and subsurface fatigue crack initiation, resulting in a stepwise S-N curve. In this case, the typical stepwise S-N relationship clearly indicates that the mechanism of fatigue crack initiation transfers from the surface to subsurface with decreasing the applied stress level. On the other hand, the S-N curves obtained at push-pull loading revealed a continuous downward slope without any indication for a plateau region and subsurface fatigue crack initiation occurs in the whole range of amplitudes. This fact has to be taken in consideration while selecting a structural material.

Słowa kluczowe

EN

fatigue; bearing steel; type of fatigue loading; push-pull; rotating bending

PL

zmęczenie; łożyska

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2010
• Tom: Vol. 15, no 2
• Strony: 321--328
• Opis fizyczny: Bibliogr. 28 poz., rys., wykr.

Twórcy

autor

Bokuvka O.

autor

Novy F.

autor

Mintach R.

autor

Cincala M.

• University of Žilina Univerzitná 1, Žilina-01026, SLOVAK REPUBLIC,

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