THERMAL TEMPERING SIMULATION OF GLASS PLATES - INNER AND EDGE RESIDUAL-STRESSES

Narayanaswamy's model is used to describe the themomechanical behavior of glass. It includes both stress relaxation (to take into account th e viscous aspect of glass) and structural relaxation (to fake into acc ount the structure state of glass). The necessary thermal and mechanic al characteristics are given for the float soda-lime silicate glass. T he thermal tempering of thin glass plates is simulated. Transient and residual stresses are given for the inner part of the plate. Computati onal results are compared with experimental results of previous works. This comparison validates Naranaswamy's model associated with materia l characteristics given previously. The edge effect (variation of stre sses close to the edges) is described for thin plates. The thermal tem pering of thick plates is simulated, and computational results are val idated with optical measurements and a fractographic analysis.