Thickness formula (1970, National Research Council)

September 12, 2007 by Kalman Feher

Hi,

I found this thickness formula @

http://irc.nrc-cnrc.gc.ca/pubs/cbd/cbd132_e.html

q = 2.15 x 10^8 wh^3/a^4 {1 + 0.165 (w/h)^2}

where q is the pressure in psi, w is the centre
deflection, h is glass thickness, and a is the length
of a side (dimensions in inches).

but can't tell if the part between curlies is a
derived simplification or part of the formula.
It seems to apply to square surfaces as only
one side is shown. Would that have to be the
length if a rectangle? Also how would this
formula work for fully tempered glass, assuming
it's for annealed?

There's no thickness formula, only a graph. Can
anyone i.d. the formula being used in the graph?

Thanks a gig.

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Thickness formula (1970, National Research Council) by Kalman Feher