Characterization of Transparent Materials for Erosion Resistance
Summary rept. May 1974-Dec 1975
BELL AEROSPACE TEXTRON BUFFALO NY
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This program is directed toward an assessment of the effects of rain erosion damage on loss in transmission of radiation through window materials. The general influence of the progression of the material removal process on the spectral transmittance of polymeric materials polymethylmethacrylate, polysulfone, polycarbonate, and nylon and soda lime glass was evaluated for wavelengths from 0.5 to 2.1 microns. Erosion mechanism evaluations were made for the window materials Chemcor, Cortran, spinel, and borosilicate glass and the infrared transmitting materials zinc sulfide, arsenic trisulfide, germanium, and sapphire, however mechanical difficulties were encountered in the AFMLBell rotating arm apparatus before the transmittance measurements as a function of the exposure to the rain environment were completed. The materials evaluated were exposed to the standard rainfield of 1.8 mm water drops at an impact velocity of 730 fps.
- Ceramics, Refractories and Glass