This paper presents the results of systematic studies carried out on the role of fine RDX in determining the burning rate and ballistics of LOVA gun propellants. Propellant formulations containing fine RDX particles with a size of 4.5, 6, 13 and 32 µm as energetic ingredient, cellulose acetate as inert binder, triacetin as inert plasticizer, nitrocellulose of lower percentage nitrogen content as energetic binder and carbamite as stabilizer were made. The evaluation of the propellant batches has been carried out by static firing using closed vessel technique. It indicates the linear relation between the burning rate of the propellant and the fine RDX particle size used in this formulation. The results of the present studies revealed that fine RDX of 4.5 to 6 µm size may be the most suitable for LOVA gun propellant to meet the desired burning rate for satisfactory ballistics.
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This paper presents the data obtained on dynamic firing ofacellulose acetate binder-based low vulnerability ammunition (LOVA) propellant using 120mmfin-stabilised armour piercingdiscarding sabot (FSAPDS) kinetic energy ammunition. An optimised propellant composition formulated using fine RDX as an energetic ingredient andamixtweofcelluloseacetate and nitrocelluloseas binderwasqualified fit for firing in a high calibregun by its successful static evaluation for absolute ballistics using high pressure closed vessel technique. Dynamic firing of the propellant processed in heptatubular geometry was undertaken to assess the propellant charge mass. This oronellant achieved hieher muzzle velocitv as comoared to the standard N O M I 19 hiole-base orooellant while . . . .meeting the non-vulnerability characteristics convincingly.
Present investigation reports the results of systematic studies on the use of bimodal RDX in low-Vulnerability ammunition (LOV A) gun propellants. Several formulations based on bimodal RDX as oxidiser, cellulose acetate as binder, aild dioctyl phthalate or triacetin as plasticizer were processed with different proportioris of 5 ~ and 20 ~ particle size ofRDX samples in the r3l1ge 100:0 to 60:40 ratios. The effect of varying tile proportion of fine RDX of the two particle sizes on propellant bunung behaviour was found to be quite signifiC3l1t. The study concluded that by using biInodal RDX, it is possible to mOOify burning behaviour witlIout sacrificing low-vulnerability aspects of LOV A propellat1ts.gun propellants reported earlier appears to be quite relevanr-4.These propellants use nitramine dispersed into inert or energetic polymeric binder-plasticizer matrix. Propellants based on such formulations have realised higher ignition temperatures and less sensitivity to impact and friction as compared to the conventional propellantss. Their ballistic performance and chemical stability are found to be superior to the nitrate .ester-based propellants in use currently.The energy level of LOVA gun propellants depends mainly on the percentage of nitramine. Because of its easy availability and comparatively low-cost, RDX has been preferred to HMX in many compositions reported earlier. It is known that the burning behaviour of nitramine propellant depends upon the particle size of nitramine used in the propellant. However, a few studies have dealt with the effect of particle size of RDX on the burning behaviour of the propellant.
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