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Développement d'une métrologie thermique des contacts glissants en freinage

Abstract : Heat generated in the pad-disc contact during braking is the main cause of surface degradations such as oxidation, wear and thermo-mechanical failure, in particular cracking. In order to estimate the consequences of thermal damage, a fiber optic two-color pyrometer was conceived, developed and validated for brake disc surface temperature and emissivity measurement. The two-color pyrometer consists of a fluoride glass optical fiber, two HgCdTe detectors equipped with bandwith filters and a data conditioning and acquisition device. The two-color pyrometer measures the brake disc temperature in the 200-800°C range with a time resolution of 8 µs. The calibration formula for the signals obtained using a blackbody of known temperature is used to compute the true temperature. The uncertainty estimation for temperature and emissivity was obtained from the calibration results. Tests were carried out on known temperature target and a satisfactory correlation was found between results obtained with our two-color pyrometer and those obtained with a commercial two-color pyrometer. Hold braking and deceleration braking tests performed on two different braking test benches enabled us to reach the brake disc surface temperature and emissivity during braking. Experimental results show a significant variation of disc emissivity during braking. Direct measurement of emissivity was carried out on the brake disc after braking and shows the emissiviy dependence with the surface quality.
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  • HAL Id : tel-03025926, version 1

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Jean Thevenet. Développement d'une métrologie thermique des contacts glissants en freinage. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2009. Français. ⟨NNT : 2009VALE0016⟩. ⟨tel-03025926⟩

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