Fatigue Failure Analysis of Polycarbonate Transparencies in Different Environmental Conditions.
Final rept. 18 May 92-1 Oct 94,
PURDUE RESEARCH FOUNDATION HAMMOND IN DEPT OF ENGINEERING
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The investigation completed under the existing contract determines the extruded polycarbonate fatigue life dependency on elevated and cooling temperatures. The specimens were manufactured from the 12-inch flat polycarbonate sheet which is used as a structural component in laminates for some F-16 aircraft canopies. The results of the investigation showed that the elevated temperature is extremely dangerous. Fatigue lives of the specimens tested on different combinations of load and elevated temperature levels were always significantly up to 10 times less compared to those tested under the same load levels at room temperature. The surface topography failure modes also were different ductile under room temperature and brittle under elevated temperatures. The investigations under cooling temperatures proved that the resistance to fatigue failure is substantially greater than that for room temperature.