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Analysis of the ballistic responses of the fibres of woven material at the microscopic scale based on numerical homogenization

Abstract : This thesis is dedicated to the study of the ballistic behaviour of woven material using a microscopic approach based on the numerical homogenization technique. Indeed, during a ballistic loading, the projectile acts locally on the impact zone of the fabric, thus generating a transverse compression of the fibres. This phenomenon has been modelled, at the fibre scale, taking into account the effects of fibre-fibre interactions and the evolution of the volume fraction of yarn during loading. From this modelling, a non-linear mechanical behaviour law describing the evolution of apparent stress and strain in a yarn subjected to transverse compression was obtained. Then, based on a periodic Representative Volume Element (RVE), a numerical homogenization technique taking into account the void between fibres was used for modelling. A power law between the apparent deformation and the volume fraction for a yarn subjected to transverse compression was deduced based on this approach. These data were implemented into a model in order to analyse the microscopic behaviour of fibres subjected to ballistic impact based on a multi-scale approach. The analysis has provided a better prediction of the physical phenomena occurring during the ballistic impact of one single yarn at the fibre scale. Then, this model was applied to the case of one fabric subjected to ballistic impact at a mesoscopic scale (yarn scale) combined with a microscopic scale (fibre scale) in the impact zone. This model was validated by comparison with experimental data, in terms of the evolution of projectile velocity. The evolution of energy, impact force, fibre-fibre interactions and local fibre failure are also analysed.
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Submitted on : Monday, September 27, 2021 - 5:51:10 PM
Last modification on : Thursday, April 28, 2022 - 9:08:06 AM
Long-term archiving on: : Tuesday, December 28, 2021 - 7:18:01 PM


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  • HAL Id : tel-03356211, version 1



Quoc Hoan Pham. Analysis of the ballistic responses of the fibres of woven material at the microscopic scale based on numerical homogenization. Mechanics of materials [physics.class-ph]. Université de Lille, 2021. English. ⟨NNT : 2021LILUI008⟩. ⟨tel-03356211⟩



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