The Resilience of Glass

JSGT 1956 V40 T445-T461

By the use of impact methods an attempt is made to follow elastic effects in glass up to temperatures above the conventional softening points. Rebound resilience is demonstrated in 'Pyrex' brand borosilicate glass at temperatures up to 1000°C and measurements of energy loss on impact compare closely with equivalent measurements from cyclic damping experiments. It is found that at the temperature of the 'softening' point the rebound of a cold steel ball on glasses of widely different composition is very close to 50% of the initial height of fall.

P. L. Kirby