Time filter

Source Type

Pune, India

The Defence Institute of Advanced Technology , previously called Institute of Armament Technology , is a Deemed University specialising in Armament Technologies and is located in Girinagar near Pune, India. Wikipedia.

Wisniewski A.,Institute of Armament Technology
Central European Journal of Energetic Materials

This paper presents a method for pressing a small shaped piece with a diaphragm made from light inertial material, intended for use as a tandem shaped charge principal warhead. The general requirements for the pressing moulds are shown. The pressing method for the small shaped piece is described with the use of the high explosive OKFOL. It concerns the pressed explosive mass, the method of mould lubrication, pressing pressure, the number of pressing steps, the method of removal of the pressed small shaped piece from the mould, and the proportions of the granulated to crushed OKFOL and itsdensity after pressing. Very high, measured densities of the pressed OKFOL in the small shaped piece at different cross-sections (bottom - top of the shaped piece) 1.761-1.813 g/cm3, i.e. (95.5-98.3)% of the calculated theoretical density of 1.84 g/cm3 were obtained for the explosive with a phlegmatizer content of 3.6%. During the trials the followingdamage can occur: cracking along the side of the cone, breaking offof someof the cylinder surface, breaking away of the shaped piece bottom during extraction. The accuracy of the shaped pieces produced, particularly their coaxiality, ensured the proper function of the tandem shaped charge warhead. Source

Wisniewski A.,Institute of Armament Technology
Journal of Applied Mechanics, Transactions ASME

The use of different explosive reactive armor reactive cassettes is shown. Functioning rules of one- and two-layered reactive cassettes are presented. The paper demonstrates different kinds of tests with explosive reactive armour Wisniewski Adam (ERAWA) cassettes. There are some examples of the simulation of impact of different types armour piercing (AP) and high explosive anti-tank (HEAT) ammunition on these cassettes. Simulation was based on "free points" computer codes. The propagation of the detonative wave in the explosive (PBX 9404 and RDX) has been described with the use of the approximation of the so-called "detonative optics," in which the front of the detonative wave is a surface of the strong discontinuity of the well-known shape (for the punctual initiation-the front is spherical) of the propagation speed, and the parameters of the medium on this surface are defined by the Chapman-Jouguet's point. Scattering of products of detonation and their influence on the liner of the RPG-7M projectile are described with the use of equations of the hydrodynamics for the cylindrical symmetry. The results of the simulation process of the impact of AP ammunition of 7.62 mm, 12.7 mm, 14.5 mm, and 125 mm caliber, the type of armour piercing fin stabilized discarting sabot (APFSDS), are illustrated in figures. The changing of the following parameters on the axis, i.e., density, thickness, collapsing velocity, and pressure while penetrating of cassettes in time function, is presented. The next step to test the sensitivity of different types of explosive reactive cassettes containing different explosive layers placed on target, is the observation of their reaction to the impact of kinetic energy ammunition. Explosives contain different percentages of wax. The examples of reaction of the two-layered explosive of different thickness with different contents of wax after projectile impact are illustrated. Computer analysis of the parameters' changes on the axis of the projectile's penetration into explosive reactive cassettes, i.e., of density, thickness, pressure, impact velocity for different thicknesses of layers of these cassettes, and the projectile type and velocity 800 m/s and 1800 m/s, enables to know the initiation conditions of these cassettes' explosive. The use of computer simulation makes possible to know the influence of the quantity of wax on the sensitivity of different thicknesses of explosives of one- and two-layered reactive cassettes. Copyright © 2010 by ASME. Source

Wang K.,Beijing Institute of Technology | Wang K.,University of Oxford | Zhang J.-G.,Beijing Institute of Technology | Jiao J.-S.,Institute of Armament Technology | And 2 more authors.
Journal of Physical Chemistry C

Bimetallic ammine borohydrides have been demonstrated to be capable of improving the efficiency of dehydrogenation and purity of the released hydrogen as compared to monometallic AMBs. We have obtained the optimized structures, orbital, and decomposition thermodynamic properties of several metal ammine borohydrides (AMB) containing [Li(BH4)n]1-n groups by performing a solid-state density functional theory calculation. The structures are abbreviated as M-Li(BH4)x(NH 3)y, where M means Li, Mg, Al, and Ca, respectively. [LiBH4] segments in these compounds play a crucial role in suppressing borane emission. Additionally, it activates the B- H···H-N bonds and decreases the hydrogen removal energies. Furthermore, the strength of M-N bonds will dictate the impurity of the ammine from the decomposition. The stability of the AMBs can be found as follows from the results of orbitals: LiMg(BH4)3(NH3) 2 > Li2Al(BH4)5(NH 3)4 > LiCa(BH4)3(NH 3)2 > [Li(BH4)(NH3)]2. Finally, the [LiBH4] group can polarize the molecule and improve the efficiency of dehydrogenation process and purity of released hydrogen from bimetallic ammine borohydrides (AMBs) as compared to monometallic AMBs, which is due to the different bond strengths of M-B and M-N bonds (M denotes different metal cations here). © 2014 American Chemical Society. Source

Deng C.,Institute of Armament Technology
IEEE Antennas and Wireless Propagation Letters

A microstrip resonator, which consists of the inner and outer square rings, is proposed for miniaturizing the parasitic elements of microstrip antennas. A pair of neighboring resonance frequencies is produced, and between them, the high impedance of the resonator is matched to the low impedance of the feedline. The impedance characteristics of the microstrip antenna loaded by one to four pieces of resonators are researched. It shows the-10-dB impedance bandwidth of the antenna is broadened from 4.7% to 10.5%, 15.5%, 15.3%, and 17.5%, respectively. The simulated and measured results prove the resonant rings loading technique is an effective method to widen microstrip antenna bandwidth. © 2013 IEEE. Source

Ampula D.,Institute of Armament Technology
Journal of Konbin

The way carry out of analysis concerning correctness working of evaluation module proposed in functioning research methodology, chosen features elements of artillery fuses was presented in the article. Probability distributions of the aptitude time of tested ammunition elements were applied for verification of undertaken post diagnostic decisions. The analysis of test results chosen fuses elements, based on the standard normal distributions were executed, further the graphic interpretations of these distributions were made. A measurement of the strength of resistance decline of the side-bolt spring was chosen for the analysis, as a way of checking MG-37 and MG-57 fuse types features. Furthermore, the author presents an illustrative comparison of normal distributions, which confirms that post diagnostic decisions had been undertaken correctly. The graphic interpretations of analyzed test results of MG-37 fuse elements type were executed by means of two-parameters gamma distribution in the comparison. Concise conclusions confirming the correctness of functioning of evaluation module in the research methodology were introduced at the end of the article. © 2015 Dariusz Ampuła, published by De Gruyter Open. Source

Discover hidden collaborations