DYNAMIC FATIGUE OF SODA-LIME-SILICA GLASS

The effect of strain rate on the room-temperature strength of soda-lime-silica glass was determined. The strength of acid-etched glass rods increased continuously from 190 200 to 284 800 psi on increasing the strain rate from 9×10-4 to 15×10-2 in./in./min. No difference in strengths was observed on testing in laboratory atmosphere or with the specimens wetted with distilled water. For abraded glass rods the strength in laboratory atmosphere varied from 12 555 to 16 540 psi on varying the strain rate from 3×10-3 to 9×10-2 in./in./min. Tests conducted with the abraded samples wetted with distilled water caused approximately a 10% reduction in strength, but no appreciable change in the strain-rate sensitivity. The stress corrosion model proposed by R. J. Charles successfully predicts the room-temperature strain-rate sensitivity of the failure process for both acid-etched and abraded glass samples. Using relationships derived from this model, it was further shown that the stress concentration relationship proposed by Inglis is valid for acid-etched glass. © 1969 The American Institute of Physics.