THERMAL EXPANSION STUDIES ON TNT
NAVAL ORDNANCE TEST STATION CHINA LAKECA
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Coefficients of thermal expansion for the three crystallographic axes of alpha-TNT were determined. The coefficient for the intermediate and long axes is about 0.00005 in.in.deg. C, and that for the short axis averages about four times this value. The thermal expansion along the short axis showed marked changes at temperatures from 55 to 65C. Plastic flow was observed along the intermediate and long axes at temperatures 8 or 9C below the melting point. Little or no flow was noted along the short axis. These observations indicate that TNT crystals have anisotropic physical properties. Thermal-shock experiments showed that fracture occurs along the short axis perpendicular to the long axis. Heating curve data did not uncover an energy change for TNT below the melting point.
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