Characterization of a Polymer Composite Section of Foreign Armor
Final rept. Aug 1998-Mar 1999
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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The chemical and physical characterization of a foreign polymer composite of Russian armor was performed. This report has identified and quantified the composition of an unknown cored section of Russian composite armor. The material was identified as a woven glass in an epoxy matrix. The environmental scanning electron microscopy ESEM results determined that the reinforcing fiber is E glass, as opposed to S glass or the Russian equivalent of S glass, Vertex. B glass is inferior to S glass in both armor and structural applications however, it is often chosen as a reasonable tradeoff because it is much more affordable. Fourier transform infrared FT-IR spectroscopy results identified the matrix to be an epoxy resin-likely a diglycidyl ether of bisphenol-A. Thermal gravimetric analysis TGA clearly showed that all specimens contain approximately 90 fiber and 10 organic resin by weight. The cored composite density was also examined. All density measurements were close to 2.0 gcu cm, which is consistent with the typical density of a highly filled glasspolymer composite. It was found that the bulk and local section density values were approximately equal within a reasonable margin common in the composite materials industry. No designed-in density gradient vs. length was observed.