The experimental research on shape of detonation wave was done for cylindrical explosive charges with 5 different energetic materials with nitrocellulose and nitroglycerine. Energetic materials were manufactured with the technology for production of ball propellants. Shape of detonation wave was determined using the method of measurement of detonation wave arrival time to a certain point in the charge. Measurement system was developed in the Military Technical Institute (VTI) in Belgrade and had 16 fibre optic cables, multi-channel optical signal detector and oscilloscope. Curvature of detonation wave was determined at two different distances from initiation point. Average radii of detonation waves were determined using the regression analysis of experimental data. Also, the change in detonation wave curvature was observed at different distances from the detonator.

Tehnologija izrade livenih kompozitnih PBX eksploziva (Plastic Bonded eXplosive), i procesibilnost, ili preradivost, ovih eksplozivnih smeša, može se sagledati sa više aspekata. U ovom radu sagledan je uticaj sastava, kompatibilnosti komponenata i veličine čestica komponenata na sledeće pokazatelje preradivosti i kvaliteta proizvoda: viskoznost smeše, gustinu i poroznost dobijenih eksploziva, kao i na brzinu detonacije kao jedan od najvažnijih parametara efikasnosti eksploziva. Tehnologijom livenja izrađeni su eksperimentalni sastavi sa različitim udelom komponenata: oktogena, amonijumperhlorata, metalnog goriva u prahu (aluminijuma, magnezijuma, bora) i hidroksiterminiranog polibutadienskog veziva. Kompatibilnost komponenata ispitana je metodom mikrokalorimetrije na uređaju LKB BioMonitor microcalorimeter. Kako pakovanje čestica ima direktan uticaj na gustinu, odnosno poroznost finalnog eksplozivnog punjenja, granulometrijska analiza praškastih komponenata izvršena je koristeći set sita i na Fišerovom podsitovnom analizatoru. Gustine su određene na uzorcima uzetim iz različitih segmenata eksplozivnih punjenja, prema metodi MIL 286C, a potom su određene i poroznosti. Neophodno je da PBX smeša u dovoljno dugom vremenu ima pogodnu livljivost ("pot life"), odnosno da postoji zadovoljavajuća vremenska zavisnost viskoziteta. Ispitano je kako se s vremenom menja viskozitet neumrežene smeše analiziranih sastava, koristeći viskozimetar Brookfield RVT. Brzine detonacije su određene primenom elektrokontaktnih sondi i elektronskog brojača Pendulum CNT-91. Ključne reči: liveni kompozitni eksplozivi; procesibilnost; viskozitet; gustina; poroznost Manufacture technology of the cast composite explosives PBX (Plastic Bonded eXplosive), and the processability of these explosive mixtures, can be viewed from different aspects. This paper considers the influence of the composition, compatibility of components and particle sizes of the components, on the following indicators of processability and quality of the product: viscosity of the uncured mixture, the density and porosity of the obtained explosive, and also on the detonation velocity as one of the main efficacy parameters of the explosive. Experimental compositions are made by casting technology with different content of the components: octogen, ammonium perchlorate, a metal fuel powder (aluminium, magnesium, boron) and hydroxyterminated polybutadiene binder. Compatibility of the components was tested by the microcalorimetry method on the device LKB BioMonitor. Particle packaging has a direct effect on the density or the porosity of the final explosive charge, so the powder grain size distribution analysis of the components was performed using a set of sieves and on the Fisher sub-sieve analyzer. Densities of the obtained explosives were determined on samples taken from different segments of the explosive charges, according to the method of MIL 286C, and then the porosities were determined as well. It is necessary for a PBX mixture to have a suitable castability for a suffici...

A simultaneous initiation of an explosive charge from two or more points can generate a localized increase in pressure, and other detonation parameters, in relation to the stable detonation of the used explosive. To achieve this increase in parameters, more or less complex initiation system has to be utilized. This paper presents a simple and inexpensive system for a simultaneous and parallel two-point initiation of an explosive charge. This system consists of a primary explosive-initiator and an attenuator made of polyetilene with two cylindrical channels-initiation points, filled with plastic explosive. The channels were placed at 24 mm distance from each other, but any distance can be used. The experiments confirmed that a simultaneous initiation was achieved.