Comportement mécanique des verres sous choc produit par interaction laser-matière : une approche expérimentale et numérique multi-échelles

Abstract : Fused silica (SiO₂) is one of the most commonly used materials in our modern society. Among other uses, it is the main component of highly critical structures like spacecraft windows or shields for optical equipments. This PhD thesis is done within the context of the ANR GLASS project, whose objective is to model the behavior of silica glass from the atomic cluster to the whole structure under dynamic loading (high pressures and high strain rates). Its main objective is to conduct an experimental study of this material in this loading domain to enable an efficient dialog between experiments and simulations. To this end, samples of fused silica are impacted with high-power laser impulses, generating a shockwave that propagates in the material. A first study is done with in situ results of shockwave propagation in fused silica, giving some data of the equation of state. Subsequently, Raman spectroscopy is used to observe the atomic structure modifications of shocked samples. These measurements show that silica glass is densified in the shocked area, and also that the zones where the highest pressures were applied are subjected to thermal relaxation. This last effect is caused by the important temperature increase during the shock loading. All these results are in accordance with those of numerical simulations performed within the ANR project. Finally, X-Ray microtomography highlight complex fracture patterns inside some of the shocked samples. Numerical simulations using peridynamic formulation, a method specialized to study fracture patterns, provide a possible scenario for the formation and propagation of these cracks.
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Corentin Dereure. Comportement mécanique des verres sous choc produit par interaction laser-matière : une approche expérimentale et numérique multi-échelles. Matériaux. Université Rennes 1, 2019. Français. ⟨NNT : 2019REN1S018⟩. ⟨tel-02281942⟩

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