Creep and Recovery of a Thermally Tempered Glass Plate at Room Temperature.

Dr. René Gy

Better knowledge of the long-term behaviour of
glass is required ‘to ensure safe use of
permanently loaded glass beams for structural
application in buildings. For this purpose, the
creep-recovery behaviour of a large thermally
tempered thick glass plate was investigated in a
’ more than one year long experiment. From ‘a
viscoelastic analysis of this experiment, it is shown
that the observed creep of glass at room
temperature is not viscous in nature but is a
delayed elastic effect. No true viscous deformation
is measurable. A long-term extrapolation of this
behaviour is attempted from which it is concluded
that the deformation of a permanently loaded
glass structural element should increase by less
than 3% over 50 years. It is also concluded that
the attenuation of the residual stress field intensity
in the tempered glass should also be less than 3%
over the same period. ’

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