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Etude et modélisation des effets de l'irradiation laser sur des matériaux composites

Abstract : The effects of a high-energy laser irradiation on glass fibres-reinforced plastics have been studied to assess the laser vulnerability of current aircraft structural components. The laser flux initial propagation within the semi-transparent composite target is characterized by multiple absorption and scattering phenomena. The identification of the resin optical properties as well as the modelling of the laser beam propagation through the material (Kubelka-Munk, Radiative Transfer Equation) have thus been carried out. However, the absorption of a certain amount of laser energy quickly leads to a temperature rise which can change the physical properties of the structure. In this manner, the phase transitions of the polymer have been identified through various experimental methods (TGA, DSC, DMA), and some models based on the Arrhenius equation have been developed to forecast the behaviour of the polymer under increasing temperature. Besides, both temperature and phase transitions also lead to some changes of the material thermomechanical properties, which have been measured by means of additional high-temperature tests. Last but not least, some laser irradiations trials on load-carrying specimens have been achieved to get some initial trends about the vulnerability of composite structures to a laser illumination. A 1D multiphysics simulation based on a FTCS scheme has finally been developed to reproduce the temporal evolution of the surface temperature fields recorded during these tests.
Keywords : Laser Fibers Composites
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Submitted on : Thursday, November 25, 2021 - 8:01:39 PM
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Vadim Allheily. Etude et modélisation des effets de l'irradiation laser sur des matériaux composites. Mécanique des matériaux [physics.class-ph]. Université de Haute Alsace - Mulhouse; Institut franco-allemand de recherches (Saint-Louis, Haut-Rhin), 2019. Français. ⟨NNT : 2019MULH1339⟩. ⟨tel-03450186⟩

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