How to Affect Residual Stresses in Glass Tempering

Antti Aronen & Reijo Karvinen, Tampere University of Technology,Finland

In order to stand high loadings, the glass used in windows and glass constructions must be tempered. In the tempering process the purpose is to create a compressive stress near the glass surface. This can be achieved with proper control of heat transfer, which effects the stress distribution in glass. The formation of residual stresses as a result of heat transfer is a complicated problem, because glass is a viscoelastic material at high temperatures. In the paper, a theory governing the formation of residual stresses is presented and the sensitivity of different parameters of the theory and the values of material properties are shown.

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