STATIC CHARGE DEVELOPMENT AND IMPACT SENSITIVITY OF HIGH EXPLOSIVES

One of the causes of accidental explosion of explosives is due to static electricity. The present study deals with the development of static electric charge resulting from compression of single crystals of pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT), N-2,4,6-tetranitro-N-methyl aniline (tetryl) and cyclotrimethylene trinitroamine (RDX). The charge developed on PETN and TNT is ''true piezoelectric'', whereas on tetryl and RDX, it is tensorial piezoelectric in nature. Measurement of the piezoelectric coefficient, dielectric constant and compressibility of these explosive crystals reveals the anisotropic character of these crystals. The static field developed under the laboratory experimental conditions, when extrapolated to the condition of detonation, bears an inverse relation with the figure of insensitivity of the respective high explosives.