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Contribution à l’étude de l’effet hygrométrique sur l’usinabilité des agrocomposites par approches expérimentale et numérique

Abstract : The machining processes of biocomposite materials have shown some scientific barriers, particularly in the case of composites with long plant fibers for which the machining remains an essential step in their production line. The complexity in the machining of biocomposites is mainly related to the multiscale cellulosic structure of plant fibers that makes them sensitive to humidity and able to absorb a significant amount of water. This significantly impacts the mechanical properties of fibers as well as those of the resulting biocomposite structure. Therefore, this Ph.D. thesis work proposes both an experimental and numerical analysis of the hygrometric effect on the machinability of biocomposites. The experimental approach was carried out using an instrumented orthogonal cutting device and a biocomposite made of unidirectional flax fibers and poly-lactic acid (PLA) matrix. The biocomposite samples were subjected to hygrometric conditioning by total immersion in water. The numerical approach was developed via a two-dimensional micromechanical cutting model that was extended to hygrometry. The experimental results have shown that the cutting of biocomposites has considerable dependence on hygrometry and that different mechanisms are involved depending on the scale of analysis and the duration of the hygrometric conditioning. These induced mechanisms are observed at the level of the natural fibrous reinforcement as well as the interfaces. The numerical approach allowed a correct prediction of the hygrometric effect observed experimentally on the cutting behavior of biocomposites after having implemented the hygrometry dependence terms in the constitutive laws of the numerical model.
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Submitted on : Monday, May 30, 2022 - 2:53:10 PM
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  • HAL Id : tel-03681688, version 1

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Amen Allah Chebbi. Contribution à l’étude de l’effet hygrométrique sur l’usinabilité des agrocomposites par approches expérimentale et numérique. Génie mécanique [physics.class-ph]. HESAM Université, 2021. Français. ⟨NNT : 2021HESAE041⟩. ⟨tel-03681688⟩

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