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Apports de l'imagerie qualitative infrarouge pour la caractérisation thermomécanique et le dimensionnement en fatigue de composites tissés 3D

Abstract : This work focuses on the thermomecanical characterisation and design against fatigue of a woven composite that is produced for research purposes by the Safran Group. The experimental characterisation is based mainly on the analyses of infrared measurements. The experimental protocols, used for generating the experimental database, are based on the heat build-up protocol, which seeks to relate the temperature variations measured under cyclic loadings to different heat sources. In order to fully exploit the experimental data, different postprocessing tools that enable to highlight mechanisms characteristic to woven composites were developed (thermal event detection, frequency analyses, ...). This experimental characterisation is then complemented by results coming from simulation/experiment comparisons. The latter enable to identify dissipative mechanisms activated under relatively low cyclic loadings. Furthermore, this dissipative mechanism description was used to introduce a rapid fatigue characterisation method that identifies an S-N curve model based on the results of tensile tests and heat build-up experiments.
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https://tel.archives-ouvertes.fr/tel-03648848
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Submitted on : Friday, April 22, 2022 - 9:04:11 AM
Last modification on : Thursday, June 2, 2022 - 5:46:19 PM

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  • HAL Id : tel-03648848, version 1

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Libor Navrátil. Apports de l'imagerie qualitative infrarouge pour la caractérisation thermomécanique et le dimensionnement en fatigue de composites tissés 3D. Matériaux et structures en mécanique [physics.class-ph]. ENSTA Bretagne - École nationale supérieure de techniques avancées Bretagne, 2021. Français. ⟨NNT : 2021ENTA0007⟩. ⟨tel-03648848⟩

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