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ANALYSE DE L'ENDOMMAGEMENT PAR FATIGUE THERMIQUE ET MODELISATION DU COMPORTEMENT THERMOMECANIQUE DE COUPLES DISQUES-GARNITURES DE TYPE TGV

Abstract : The industrial context of the thesis is to understand and model the thermal solicitation of TGV brake discs in order to determine the disc surface damage. For the four types of commercial pad used, the damage results firstly in a fast appearance of a cracking network on the surface and, secondly, in a development of macroscopics cracks, depending on the pad type. The study proceeds in three stages: i) determining the thermal loadings of the disc, according to the characteristics of the pad used; ii) calculating the stress fields and deformation during brakings; iii) analyzing their criticality regarding to the risks of cracking network and cracking. For that, a new campaign on a full scale test bench was carried out with a detailed attention to the thermal measurements. For numerical modelling, 2D and 3D models of the disc are used to simulate hot bands or macroscopic hot spots. Thermomechanical loading is analyzed for the various pad types; disc loadings are either based on simplified thermal fields, or issued from thermographic films resulting from the tests. Lastly, a model of the complete brake is used to determine the influence of parameters of the pads on the localization of the heat flux and the distribution of contact pressure. Parametric studies are then undertaken to release the influence of the physical and mechanical parameters of the pads, and to propose, in a predictive step, ways of improvement in the design of new pads less prejudicial regarding to the risks of cracking.
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https://tel.archives-ouvertes.fr/tel-00222866
Contributor : Jonathan Wong <>
Submitted on : Tuesday, January 29, 2008 - 2:59:30 PM
Last modification on : Tuesday, November 24, 2020 - 2:18:04 PM
Long-term archiving on: : Friday, April 30, 2010 - 4:17:46 PM

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  • HAL Id : tel-00222866, version 1

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Jonathan Wong. ANALYSE DE L'ENDOMMAGEMENT PAR FATIGUE THERMIQUE ET MODELISATION DU COMPORTEMENT THERMOMECANIQUE DE COUPLES DISQUES-GARNITURES DE TYPE TGV. Mécanique [physics.med-ph]. Ecole Centrale de Lille, 2007. Français. ⟨tel-00222866⟩

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