Elaboration d’un outil numérique reliant les échelles micro/méso d’un composite thermoplastique sensible à l’humidité et à la température en quasi-statique

Abstract : The objective of this PhD thesis is to create a methodology to simulate the behavior of a 2x2 glass/PA66 twill composite using homogenization. To achieve this goal, we use two steps: first one is dedicated to represent the yarn behavior and the second one to represent the behavior of the composite RVE. An experimental characterization campaign about the PA66 has been done in order to quantify the influence of both hygrometry and temperature on the behavior of the matrix in quasi-static. Then, we formulated, implemented and validated an isotropic elasto-plastic damageable constitutive law. It was used to identify by homogenization the behavior of the yarns by assuming a perfect bonding of the fibers and the matrix as well as a water homogeneity inside the yarn. Thanks to the identified behavior of the yarns and by formulating a compatible constitutive law (anisotropic elasto-plastic damageable), we have determined for the woven composite on one hand the elastic properties and in the other hand the longitudinal/transversal and shear nonlinear behaviors. The comparisons of the numerical and experimental results offer satisfactory results. It provides good outlook in short-term in regard of structures design which include this type of woven composite materials. The main advantage of the methodology is to decrease the number of required experimental tests. Some outlook dedicated to crash studies are finally suggested.
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Anh Tuan Dau. Elaboration d’un outil numérique reliant les échelles micro/méso d’un composite thermoplastique sensible à l’humidité et à la température en quasi-statique. Génie mécanique [physics.class-ph]. École centrale de Nantes, 2019. Français. ⟨NNT : 2019ECDN0004⟩. ⟨tel-02149967⟩

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