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This paper is devoted to a complimentary view of rolling contact fatigue testing, to have a better prediction of bearing-steel fatigue strength in the gigacycle regime. From a practical point of view, the bearing steels are loaded up to the very high-cycle fatigue regime, in service, far away from the Wohler regime, which is the standard reference. In spite of a possible frequency effect, a procedure based on ultrasonic fatigue is discussed to open some ways of investigation, in the range of 109 cycles: accelerated fatigue testing, thermal dissipation, fish-eye formation, inclusion effect, short-crack propagation, and stability of the microstructure.
gigacycle fatigue, bearing steels, ultrasonic fatigue
Emeritus Professor, U-Paris Ouest, LEME, Ville d'Avray,