Dynamic Strength of Soda-Lime Glass at High Pressures and Strain Rates*

Understanding the behavior of silica glasses at high pressures and strain rates is of great importance for geological processes and highly relevant to many technological applications including high-powered laser-matter interactions in optical elements and impact/blast damage in defense systems. A high-pressure pressure-shear plate impact (HP-PSPI) experimental technique is developed and applied to the investigation of the dynamic strength of soda-lime glass. Sample layers with thicknesses of 5-300 $\mu $m, sandwiched between high-impedance tungsten carbide plates, are impacted at skew angles of 16 and 18 degrees. A forward analysis method, based on finite element simulations, is employed to match the experimentally observed sample response while considering the inelastic deformation of the utilized tungsten carbide anvils. A constitutive law for soda-lime glass has been developed, which transitions the material strength from an intact value of 2.8 GPa below pressure-dependent characteristic strains of 10-30{\%} to a failed granular state following extensive inelastic shear deformation. The proposed rate independent material description accurately predicts the measured response during HP-PSPI experiments over a wide range of normal stresses (9-21 GPa) and strain rates (3x10$^{\mathrm{5}}$-2x10$^{\mathrm{7}}$ /s).