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PROPERTIES OF GLASSES AT ELEVATED TEMPERATURES.
Annual summary rept. no. 8, 1 Jan-31 Dec 63,
NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD
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In order to establish realistic design criteria applicable to selected oxide glasses having utility as viewing windows in Air Force vehicles, certain physical properties have been determined throughout the useful temperature range of these glasses. Temperatures below which no creep was detected for annealed specimens at stresses of 33 of the average modulus of rupture are reported for five of the glasses in the program. The relationship of the area under stress to the strength for annealed plate specimens was investigated. It was found that 1 fracture originates randomly throughout the area of uniform stress, 2 the strength decreases as the area under maximum stress increases, and 3 specimens that fracture at the edge are generally weaker than those that fracture at the surface. Author
APPROVED FOR PUBLIC RELEASE