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).