Fissuration de fatigue en mode mixte sur disque brésilien et influence du lubrifiant

Abstract : Mixed mode fatigue crack propagation experiments were conducted via the "brazilian disc" test as a simulation of the phenomenon of pitting. (Pitting was observed to result from the initiation of a crack and its further propagation, followed by the fracture of the remaining material between the crack-tip and the surface). An equivalent stress intensity factor is proposed to traduce crack propagation rate, which takes into account the delay we observed in certain cases. Equivalent straight crack approximation and "branched" crack concept are needed for our calculations. A simulation of the crack path is also proposed by using the maximal tangentiel stress (M.T.S.) criteria lubrification was shown to have a complex influence on crack growth rate. Experiments in a lubrication cell pointed out a chemical effect of the lubricant and a decrease of the friction between the crack-tip and the surface, due to the lubricant
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Denis Hiebel. Fissuration de fatigue en mode mixte sur disque brésilien et influence du lubrifiant. Autre. Université Paul Verlaine - Metz, 1987. Français. ⟨NNT : 1987METZ022S⟩. ⟨tel-01775744⟩

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