Effect of Heating Time on the Thermal Stress Resistance of a Soda‐Lime‐Silica Glass

A model study was conducted of the thermal fatigue and single‐cycle thermal shock resistance of indented soda‐lime‐glass rods heated over durations sufficiently short that thermal equilibrium was not reached prior to quenching into a water bath. The experimental results indicate that for short heating periods thermal fatigue life at fixed ΔT and the critical quenching temperature difference (Δ7 _c ) for a single‐cycle quench significantly exceed the corresponding values obtained for specimens heated for sufficiently long periods that conditions of final thermal equilibrium were obtained prior to quenching. The implications of these results for single‐cycle and multicycle thermal shock testing are discussed.