Abstract
The tempering process strengthens the bending strength and impact strength of the glass, but it alters the elastic modulus of glass as well. Aim of this study is to investigate the variations in the elastic modulus of soda-lime-silica (SLS) glass after tempering. The elastic modulus of intact SLS glass is measured using the elastic support-free end beam test method. Additionally, the elastic modulus of broken SLS glass that had released the tempering stress is measured using nanoindentation. The experimental results show the tempering process reduces the elastic modulus of SLS glass, the reduction is related to the tempering level and glass thickness, the existence of tempered stress does not influence the elastic modulus of tempered SLS glass. Finally, the mechanism of variation in the elastic modulus of tempered glass is elucidated. Ignoring the effect of tempering will lead the elastic modulus of the SLS glass to be wrongly estimated.
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