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ELFIE - Study of oxides glasses behavior under shock produced by ultra-short laser (D. Loison)

This proposal concerns the study of the mechanical behavior (plasticity and damage) of oxides glasses under high strain rates conditions using Ultra‐short shock produced by laser. So called thermodynamically “strong” glass systems such as SiO2, GeO2, anorthite, albithe will be prepared in collaboration with the IPGP. The aim is to study how strong glass systems do structurally accommodate high‐pressure levels with a high strain rate generated by shock waves induced by laser. For this purpose, ultra‐short Laser shock coupled with complementary diagnostics (HV, VISAR, shadowgraphy) allows for the observation of the glass behavior, particularly the shock wave propagation into the vitreous network structure that produces densification of the glass followed by crack initiation due to intrinsic defects or irregularity of the loading. These experimental tools are also of interest to study the dynamic strength of the subsurface zone, including extrinsic defects such as microcracks. Thanks to a better control of the experimental conditions (see 15‐TW‐F3) an other point of interest is to gather pertinent experimental data that will be directly used for the validation of numerical modeling techniques among which MD (molecular dynamic), DEM (Discrete Elements Models) as well as FEM (Finite Elements Models). The final objective is the development of a predictive approach of the material’s behavior in order to avoid crack initiation from the extrinsic defects (surface cracks, roughness). This project brings together expert teams across all disciplines involved: Glass material, Laser shocks, MD, DEM and FEM Simulations gathered in the ANR funded project (GLASS) that started at the beginning of 2015. The GLASS consortium is made of IP‐Rennes Dpt Mechanics and Glasses, PIMM Arts & Métiers Paris, CEA‐DPTA, I2M Arts & Métiers Bordeaux.

ELFIE : S23 / 2016
co-PI: L. Berthe (PIIM)