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Etude et modélisation de la fatigue de contact en présence d’indentation dans le cas de roulements tout acier et hybrides

Abstract : The nitrided 32CrMoV13 steel is a gradient properties material used for the production of aeronautical bearing rings. The principal advantages are its surface hardness and core ductility, useful against debris denting. Moreover, to improve rolling bearing performances, ceramic balls (silicon nitride Si3N4) instead of steel (M50). The present study aims to investigate the contact fatigue performance in presence of indentation for two pairs of materials (nitrided 32CrMoV13 steel / M50 and nitrided 32CrMoV13 steel / Si3N4). This performance is mainly oriented in terms of lifetime of the indented contact by a crack initiation criterion. A study of the mechanicals properties of the nitrided 32CrMoV13 steel, required for the application of the criterion, is then performed. It allows to characterize the hardening law and the cyclic micro-plastic behavior of the nitrided layer of the nitrided 32CrMoV13 steel. Crack initiation properties of the nitrided surface layer have been evaluated by compression tests on thin hollow cylindrical specimens with small cylindrical holes. The contact fatigue behavior in presence of indentations was studied on a high-speed twin-disks machine. These tests allowed to characterize the difference in behavior of nitrided 32CrMoV13 steel (indented) in a steel-to-steel contact or steel-to-ceramic contact. The major effect of sliding has been highlighted. All these experimental studies were coupled with numerical simulations to calibrate the physical model of crack initiation and to show its capabilities. In conclusion a new model of rolling contact fatigue life has been proposed. It is specifically adapted to operation in presence of residual stresses such as resulting from debris denting. The model uses mechanical properties that have been identified for thermo-chemically treated layers of nitrided 32CrMoV13 steel.
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https://tel.archives-ouvertes.fr/tel-00749925
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Submitted on : Thursday, November 8, 2012 - 3:52:20 PM
Last modification on : Wednesday, October 14, 2020 - 4:01:38 AM
Long-term archiving on: : Saturday, December 17, 2016 - 8:53:06 AM

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  • HAL Id : tel-00749925, version 1

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Emmanuel Tonicello. Etude et modélisation de la fatigue de contact en présence d’indentation dans le cas de roulements tout acier et hybrides. Autre. INSA de Lyon, 2012. Français. ⟨NNT : 2012ISAL0047⟩. ⟨tel-00749925⟩

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