10.4224/23000206
Heath, J.B.R.
J.B.R.
Heath
IAR
IRA
Gould, R.W.
R.W.
Gould
IAR
IRA
Degradation of the bird impact resistance of polycarbonate
National Research Council Canada. National Aeronautical Establishment
1982
NRC Institute for Aerospace Research
IN20
1982-01-06
en
technical report
3244094
23000206
LTR-ST-1326
29 p.
This report describes a program, comparing the bird impact resistance of new as-extruded polycarbonate with polycarbonate that has undergone natural aging, artificial heat aging, fabrication heat treatments, and fabrication heat treatments with subsequent artificial heat aging. The two pound bird impacts were carried out on flat 24 inch by 24 inch monolithic specimens, mounted 45° to the horizontal. A rigid test frame incorporating a "clamped" specimen edge design was utilized. Bird impacts on the modified material resulted in a significant decrease of penetration velocity, with a corresponding change from a ductile to a brittle type failure mode