This paper gives the results of an experimental study on nitramine extruded double-base (EDB) fonnulationscontaining up to 25 percent RDXin low and high calorimetric value double-base(DB) propellants. The effect of ballistic modifiers on the burn rate and pressure exponent ( 11) of promising fonnulations has also been investigated. The data generated on various parameters reveal that ( i) nitraniine EDB propellants exhibit relatively superior thennal stability,' (ii) tensile strength and percentage elongation are drastically altered if RDX concentration exceeds 15 per cent, (iii) 11 is lowered significantly in the presence of ballistic modifiers, (iv) characteristic velocity (C*) values are higher to that for the control tonnulation, and ( v) temperature sensitivity of burn rate is on the lower side (0,20 -0.25 % / °C as against 0.40 % / °C) in the presence of ballistic modifiers.shown remarkable improvement in burn rate and '1 values. Keeping in view the above facts and also in the absence of adequate data on nitramine extruded double-base (EDB) propellants, it was considered of interest to formulate and process a set of nitramine EDB propellants incorporating RDX as an energetic. material with and without ballistic modifiers and to study sensitivity, burning behaviour, chemical, thennal and mechanical properties and ballistic performance of a few promising formulations, This paper reports the results on low and high calorimetric value (cal val) nitramine EDB propellants.
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