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Thermal and thermomechanical characterisation of carbon and ceramic fibers at very high temperature

Abstract : The main objective of this work is the determination of thermal and thermomechanical properties of micrometric carbon and ceramic fibers at very high temperature (1000-3000 K). In order to realise such measurements on thin body and on a wide temperature range, our efforts are directed towards: thermal modelisation of the phenomena, development of steady data processing method, experimental optimisation and estimation of error sources. Moreover, a lot of characterisation was realised (often unpublished) in way to supply accurate knowledge on thermal and thermomechanical properties of carbon fibers. In the first part, relative to the determination of the thermomechanical properties of fibers, the difficulty came from the very low variation to measure (a few nanometers), on materials with a characteristic dimension of 10 mm. The method developed here allows both measurements: transverse coefficient of thermal expansion and Poisson ratio. In the second part, the specific heat at constant pressure by an analytical model was firs estimated and then the thermal diffusivity by a data processing method in way to calculate the thermal conductivity. In both cases, the difficulty due to the microscale of the material and the very high temperature have repercussions on the experimentation, the modelisation and the development of data processing methods.
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https://pastel.archives-ouvertes.fr/pastel-00001547
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Monday, January 16, 2006 - 8:00:00 AM
Last modification on : Tuesday, December 3, 2019 - 8:58:20 AM
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Christophe Pradere. Thermal and thermomechanical characterisation of carbon and ceramic fibers at very high temperature. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2004. English. ⟨NNT : 2004ENAM0021⟩. ⟨pastel-00001547⟩

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