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Numerical and experimental investigations on the residual stresses at the centre of flat glass disks after thermal tempering

: Soulié, F.; Siedow, N.; Anton, J.; Lochegnies, D.


Liska, M. ; International Commission on Glass:
Glass - the challenge for the 21st century : Selected, peer reviewed papers from the 9th ESG conference, June 22 - 26, 2008, Trencin
Stafa-Zurich: Trans Tech Publications, 2008 (Advanced materials research 39/40)
ISBN: 0-87849-387-5
ISBN: 978-0-87849-387-6
European Society of Glass Science and Technology (Conference) <9, 2008, Trencin>
International Commission on Glass Corporation (Annual Meeting) <2008, Trencin>
Fraunhofer ITWM ()

Flat glass disks are thermally tempered by air-cooling with two air jets at the centre of their surfaces. Numerical modelling and photoelasticity measurements are proposed to analyze the distribution of the residual stresses through the glass thickness at the centre of the tempered disks. For the modelling, glass properties dependent of the temperature are used for the conductive heat transfer. Radiation is modelled by an improved approximation method. By taking both structural and stress relaxations into account, the transient and residual stresses are computed along the disk thickness. For experimentation, a complete procedure is proposed to access to the stress state in the centre of the disks using a scattered light polariscope. The average distribution of the residual stresses is deduced from stress profile measurements taking four radial orientations at the disk centre into consideration. Comparison between numerical and experimental values is finally discussed for the residual surface and half-thickness stresses at the disk centre.