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Prévision de la durée de vie en fatigue des roues ferroviaires sous ollicitations multiaxiale proportionnelle et non-proportionnelle

Abstract : The experience shows that the fracture of the components or structures in normal working conditions is often due to fatigue. The aim of this works is to propose a criterion which predicts the life duration in endurance fatigue. For this purpose, a signal has been raised during the tests. In order to apply this signal the specimens are extracted from the wheel. Annexe Fatigue Multiaxiale en endurance illimitée 145. Our Instron machine is not predisposed for the realization of this type of loading ; therefore a Labview program has been set which enables to introduce all points of the cycle. The experimental results are compared to the prediction of the various criteria. The application of the various criteria predicted results different from the experimental data. In this perspective, a semi local approach based on the application of the volumetric method has been proposed. Two methods have been proposed to depict the test results in fatigue strength diagram. The first consists in depicting a load factor as a function of the number of cycles to fracture. While the second consists in representing the maximal von Mises stress versus the number of cycles to fracture diagram. Numerous studies showed the influence of the signal in the endurance domain. Experimental results of the present study confirmed these findings. It is noted, the effect of the loading on the life duration becomes negligible from a life duration of 10-7cycles i.e. low values.
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Abderrahim Chamat. Prévision de la durée de vie en fatigue des roues ferroviaires sous ollicitations multiaxiale proportionnelle et non-proportionnelle. Autre. Université Paul Verlaine - Metz, 2005. Français. ⟨NNT : 2005METZ009S⟩. ⟨tel-01752419⟩



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