New Aircraft Windshield Applications Using Ion Exchange Glass,
PPG INDUSTRIES INC PITTSBURGH PA GLASS RESEARCH CENTER
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The primary goal of the test program was to develop stress versus velocity curves for each of seven cross sections. To minimize the effect of other variables, the samples were 26 inches square with radius corners and were fabricated with outboard glass thickness and interlayer thicknesses held constant while the internal and inboard glass ply thicknesses were varied. Each sample was instrumented with a minimum of one 2-element rosette strain gage on the inboard glass surface opposite the impact point. Prior testing had confirmed that the maximum stress would always be at the inboard surface of the inner glass ply on two structural ply laminates. Some samples had additional element gages above and below the impact point to determine the peak stress location. To determine the effect of test frame stiffness, curves were developed at a 37 degree angle to the bird path in two different test frames.