Responses of Siliceous Materials to High Pressure

Abstract

Several silicate-based materials were subjected to high pressure loading using spherical indentation, diamond anvil cell (DAC) testing, and laser shock impact. The test methods were chosen because they can apply many gigapascal (GPa) of pressure, are relatively quick and inexpensive to experimentally conduct, produce repeatable results, induce a bulk material response, and enable in-situ or postmortem material analysis. Differences in apparent yield stress, hydrostatic pressure, and laser shock responses were observed among the materials and are described herein.

Borofloat and Starphire Float Glasses: A Comparison,

“…The measured apparent yield stress ( S app ) of Starphire was greater than that of Borofloat as shown in Fig. .…”

“…High-pressure diamond anvil cell testing showed peaks in the Raman spectra tended to form for all the glasses and glass ceramics by the time a stress of 10 GPa was applied indicating long-range ordering was being induced while under pressure. 14,15 This is illustrated in Fig. 9.…”

“…Arrows show peak shifts. The increased pressure induces some reversible structural ordering in both glasses …”

“…This resulted in Borofloat exhibiting: a lower flexure strength; initiation of laser shock damage at lower impact pressures and crack initiation at smaller contact forces (Fig. ); and differences in ball impact resistance . These distributions, concentrations, and their differences among the two glasses will also affect strength‐size scaling.…”

“…Comparison of average apparent yield stress for two glasses for both their air-and tin sides. 14,15 Estimated using spherical indentation.…”