Do you know of any industry standards or research that addresses:
a) Are there any upper limits to allowable tempering psi? I only know of a minimum of 10k psi for glass to be considered safey glass, but have not heard of any upper limits
b) Are there any studies that explore high psi to spontaneous breakage or other adverse effects of high psi?
Can you assist with these questions?
With great appreciation,
Dear Mark Meshulam ,
You may have a look at "The Glass Tempering Handbook" for answering your question. You can find the source easily via the website search.
Regards.
The dynamic thermal stress responses were simulated in this paper using a finite element program. The general linear dynamic response equilibrium of a system is solved using the Newmark method. The Coulomb-Mohr criterion was employed to predict the crack initiation and SIFs based mixed-mode criterion was employed to predict the crack growth. The maximum stress is located at the edge of the glass pane between the hot and cool glass parts, and the stress fluctuates seriously at later stage before crack initiation. The crack initiation locations are at any of the four edges of the pane. Under a rapid rate of temperature rise, a smaller temperature rise could result in a bigger dynamic stress, which cannot be ignored in the prediction of glass cracking. Under a slower rate of temperature rise, the dynamic effect becomes weaker and the thermal stress can be simply evaluated using a static method.
At the automotive glass industry many practice methods are exist, which may idetificate quality of tempering. Common methods are crash test.
Maybe You can find some usefull information in document (Toughened-glass chapter), which were attached in the letter.
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