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From the determination of thermal properties of fibers to multiscale modeling of heat transfer in composite

Abstract : The prediction of effective thermal properties of composite requires information at small scale and also appropriate numerical 3D models able to account explicitly the local distribution of fibers. In our work, the 3ω method is used for estimating the axial and radial thermal conductivities and volumetric heat capacity of single carbon fiber. Using analytical and numerical models, a sensitivity analysis is performed for choosing a proper frequency range. A constant current source with differential and lock-in amplifiers are used to measure the thermal conductivity of chromel, and FT300B, FT800H carbon fibers. The measured axial thermal conductivities are in good comparison with the literature values. The estimated radial thermal conductivity of FT300B carbon fiber is 10 times lower than the axial one and shows much larger confidence band due to smaller.sensitivity coefficients. The computation of the effective thermal conductivity by homogenization technique is done for uniform square cell microstructures (100 fibers) along with composite tapes (700 fibers). The effective properties of tapes are interesting for advanced manufacturing techniques such as Automated Fiber Placement (AFP). A 3D thermal model is developed for the tapes heated by a laser source. Meshes in resemblance to the multiple microstructures of Solvay and Suprem tapes are generated. The heat source distribution within the composite during manufacturing is presented and the temperature distribution shows a strong inhomogeneity of the temperature inside the tape. The calculated average temperature is compared with the experimental results. Results confirm the need for specific continuous models.
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Submitted on : Friday, November 29, 2019 - 3:30:02 PM
Last modification on : Friday, March 27, 2020 - 10:21:20 AM


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Ketaki Mishra. From the determination of thermal properties of fibers to multiscale modeling of heat transfer in composite. Thermics [physics.class-ph]. UNIVERSITE DE NANTES - Ecole doctorale Sciences pour l'Ingénieur Spécialité : « Energétique-Thermique-Combustion », 2019. English. ⟨tel-02387026⟩



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