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Développement d’une loi de comportement pour les méthodes de dimensionnement des chargements en propergol solide composite

Abstract : This work describes the development of a viscoelastic nonlinear constitutive law for solid composite propellants. An experimental basis showing the nonlinear behavior expressed by solid propellants is constructed. Then, microscopic sources of this macroscopic behavior are investigated using new samples specifically designed. Results show that friction and cavitation are responsible for the major parts of the nonlinearities. Homogenization is used to determine mathematical relations between these two mechanisms and the mechanical properties of the material. The relations are then integrated in a viscoelastic, isotropic, tridimensional model. Parameters are identified using the experimental basis. The model shows a good ability to reproduce and predict the propellant behavior nonlinearities expressed under cyclic loads. After completion of the development, the model is used into a design method and finite element calculation are performed on real objects. Results validate the new method and show that improving the behavior prediction also improves the design method and generates profits.
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Submitted on : Tuesday, July 7, 2020 - 2:53:23 PM
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  • HAL Id : tel-02892287, version 2

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Marion Picquart. Développement d’une loi de comportement pour les méthodes de dimensionnement des chargements en propergol solide composite. Mécanique des matériaux [physics.class-ph]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASC019⟩. ⟨tel-02892287v2⟩

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