Effects of Surface Flaws on Impact Resistance of Uncoated Polycarbonate
Interim technical rept. Jun-Jul 1981
DAYTON UNIV OH RESEARCH INST
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Uncoated aircraft transparency polycarbonate is highly susceptible to surface abrasions. This report describes an experimental effort of limited scope to determine the effects of flaws on the resistance of polycarbonate to the impulsed, high energy loading conditions of bird impact. Test fixturing for flaw formation and high rate load application to polycarbonate beam specimens is described. It is demonstrated that polycarbonate is sensitive to changes in scratch profile and is less sensitive to changes in scratch depth. Net absorbed energy decreases with increasing scratch depth. However, scratches of any depth produce fracture if the scratch has a sharp, V-shaped profile.