Published experimental data indicate that under most conditions lamina
ted glass strength equals or exceeds the strength of monolithic glass
of the same nominal thickness. To date, these experimental data exist
without a theoretical model. This paper presents a theoretical, engine
ering mechanics model that accounts for factors that affect laminated
glass behavior including temperature, thickness of the interlayer, and
composition of the interlayer. It presents additional fracture streng
th data for laminated glass lites with a thicker interlayer than in pr
evious tests. Both the theoretical model and the new fracture strength
data indicate that laminated glass strength increases as interlayer t
hickness increases and that laminated glass strength decreases as temp
erature increases. Although an increase in temperature beyond 38 degre
es C (100 degrees F) leads to a decrease in laminated glass strength,
the theoretical model indicates that laminated glass possesses signifi
cantly more strength than ''layered glass,'' e.g., simply, two plies o
f glass with no shear transfer, at temperatures above 49 degrees C (12
0 degrees F).