Étude à coeur des propriétés de matériaux innovants par la compréhension de la propagation d’une onde électromagnétique à travers une onde de choc

Benoit Rougier 1
1 LAAS-MINC - Équipe MIcro et Nanosystèmes pour les Communications sans fil
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : The mechanical properties of solids under shock wave loading are a key factor in many industrial applications. This work aims at defining a new approach for the simultaneous measurement of shock wave and particle velocity during a shock event, using millimeter wave interrogation. With the two determined parameters, the shock polar of any material can be derived. First, a review of the classical methods to determine these quantities is presented, to identify the advantages and limits of such techniques. A modelization work is then performed to understand the propagation of electromagnetic waves in a stratified mediumwith moving interfaces and different refractive index in each of the layers. Such a configuration can be used to describe both steady and unsteady shocks on solids. Last, experimental results of plane impact tests on both inert and reactive materials are presented and analyzed to comfort the modelization. For steady shocks, the results are in very good agreement and prove the developed model to be adequate. The case of unsteady shocks is more complex, and a neural network approach is described to solve the problem. Finally, new data on the permittivity of high explosives and a new setup are described.
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Benoit Rougier. Étude à coeur des propriétés de matériaux innovants par la compréhension de la propagation d’une onde électromagnétique à travers une onde de choc. Electromagnétisme. Institut National Polytechnique de Toulouse (INP Toulouse), 2019. Français. ⟨tel-02018790⟩

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