Originally posted by LadyofGlass
reply to post by StargateSG7
Please provide sources of glass (silica, silica dioxide) creeping after a few weeks.
edit on 21-7-2013 by LadyofGlass because: (no reason
As far as I know glass creep would NOT happen over a few weeks but rather a few years
(as I stated earlier) but here are some respectable sources of information regarding the
phenomenon of "creep" in glasses, ceramics and metals:
General Overview of Creep:
Glass Creep is VERY OBSERVABLE in space:
Advanced Ceramics and Future Materials
By Fritz Aldinger, Volker A. Weberruss:
Creep is a result of Glass being an Amorphous Solid:
Creep Testing of Glass Ceramics at higher temperatures:
THIS IS THE BIG ONE:
Elastic rather than Viscous creep was less than 3% over 50 years for glass plate:
The above abstract basically tells us that true sludge-like glass creep is not a factor over periods
up to 50 years BUT rather there may be ELASTIC creep due to temperature, torsion, flexion or shear
stresses APPLIED to glasses of all types.
As per my earlier statements, I did say there was a MEASURABLE creep over as little as two years.
What I DID NOT REALIZE is that this may not be an example of viscous creep but rather ELASTIC
deformation due to APPLIED MECHANICAL STRESSES OVER TIME rather than internal viscosity.
This was NEWS TO ME!
I has no idea that short term elastic deformation was such a problem in glass or ceramic.
I always KNEW there was "creep" but I was always under the impression that it was the
internal viscosity created by the amorphous nature of the glass particles and its issues
with "static adhesion" between the micro-scale particles of the silica or oxide ceramics.
I DID NOT factor in temperature or mechanical stresses into the equation over time!
I still STAND BY my assertion of "creep" in glass being visible or measurable over periods
of time within two to five years....BUT... I must CHANGE my belief from that it is due to
viscosity OVER TO mechanical stressors!
WELL WELL WELL I learn something new every day!