Influence des garnitures de frein sur les sollicitations thermiques des disques TGV et conséquences sur les risques de fissuration

Abstract : The occurrence of macroscopic cracks in some TGV brake discs in commercial service has been linked to the pad type used. The objective of this thesis is to understand this relationship, to identify sensitive parameters and to propose guidelines to the design of pads reducing the risk of cracking.The thermal behavior of four disc-pad couples is first analyzed through an original experimental campaign of braking. It highlights various types of thermal localisations and enables to identify thermal signatures characteristic of the various pads. The relationship between thermal localisation and risk of cracking is then determined using thermomechanical modeling. Some indicators taking into account spatial and temporal characteristics of thermal localisations and temperature levels achieved are proposed. They enable to classify the tested pads in a graph of "criticity". Finally, a study of the influence of mechanical and thermal properties of pads on the thermal localisations occurrence enables to propose guidelines and improving ways for the design of new pads. An experimental characterization of the behavior of two new pads, one very close to the given recommendations, the other strongly away from them, shows the relevance of the approach and the validity of the present recommendations
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Engineering Sciences. Ecole Centrale de Lille, 2009. French. <NNT : 2009ECLI0025>


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Paul Wicker. Influence des garnitures de frein sur les sollicitations thermiques des disques TGV et conséquences sur les risques de fissuration. Engineering Sciences. Ecole Centrale de Lille, 2009. French. <NNT : 2009ECLI0025>. <tel-00579663>

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