Institute of Armament Technology

www.diat.ac.in
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.


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Swiderski W.,Institute of Armament Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

Eddy current thermography is a new NDT-Technique for the detection of cracks in electro conductive materials. It combines the well-established inspection techniques of eddy current testing and thermography. The technique uses induced eddy currents to heat the sample being tested and defect detection is based on the changes of induced eddy currents flows revealed by thermal visualization captured by an infrared camera. The advantage of this method is to use the high performance of eddy current testing that eliminates the known problem of the edge effect. Especially for components of complex geometry this is an important factor which may overcome the increased expense for inspection set-up. The paper presents the possibility of applying eddy current thermography method for detecting defects in ballistic covers made of carbon fiber reinforced composites used in the construction of military vehicles. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.


Dragan K.,Air Force Institute of Technology | Swiderski W.,Institute of Armament Technology
Acta Physica Polonica A | Year: 2010

This work presents the modern approach to the detection of various types of defects in composite structures used in aerospace. In such structures, including glass reinforced plastics and carbon reinforced plastics, different failure modes could occur at a manufacturing stage and during service life. Defects are connected with inadequate technology, poor workmanship, cycling fatigue loads, impact damage and environmental conditions. The main types of defects are delaminations, disbonds, foreign object inclusions and porosity. To detect such defects, several non destructive evaluation techniques can be applied, merely to mention ultrasonic, low frequency acoustics, infrared thermography and shearography. The use of multimode non destructive evaluation techniques enables characterization of defects which cannot be detected by using single non destructive evaluation methods. This paper demonstrates the necessity of using non destructive evaluation methods for the implementation of quality control and maintenance procedures while servicing aerospace composite elements.


Kruszka L.,Military University of Technology | Magier M.,Institute of Armament Technology
EPJ Web of Conferences | Year: 2012

The main aim of studies on dynamic behaviour of construction materials at high strain rates is to determine the variation of mechanical properties (strength, plasticity) in function of the strain rate and temperature. On the basis of results of dynamic tests on the properties of constructional materials the constitutive models are formulated to create numerical codes applied to solve constructional problems with computer simulation methods. In the case of military applications connected with the phenomena of gunshot and terminal ballistics it's particularly important to develop a model of strength and armour penetration with KE projectile founded on reliable results of dynamic experiments and constituting the base for further analyses and optimization of projectile designs in order to achieve required penetration depth. Static and dynamic results of strength investigations of the EN AW-7012 aluminium alloy (sabot) and tungsten alloy (penetrator) are discussed in this paper. Static testing was carried out with the INSTRON testing machine. Dynamic tests have been conducted using the split Hopkinson pressure bars technique at strain rates up to 1,2 · 104 s-1 (for aluminium alloy) and 6 · 103 s-1 (for tungsten alloy). © Owned by the authors, 2012.


Magier M.,Institute of Armament Technology
Proceedings - 27th International Symposium on Ballistics, BALLISTICS 2013 | Year: 2013

During 25th ISB in China a poster was presented with a conception of segmented kinetic energy penetrators for tank guns. The penetrator is composed of two tungsten alloy pieces connected by screwed steel muff. The axial deformation of the connecting muff during penetration process results in decreasing of the distance between tungsten segments. For this reason the rear segment can hit the front segment to give it some additional kinetic energy enhancing penetration depth. A new concept called "forced segmented penetration" was presented in Journal of Applied Mechanics [1]. A numerical optimization of the new concept kinetic energy penetrator and its influence to the penetration process was presented in the paper [2] (26th ISB in Miami). In this paper firing tests of some variants of subcalibre projectiles with segmented penetrators are presented. This examination was crucial for the completion of this research work and making the synthesis of theoretical results with numerical analyses and experimental tests.


Wisniewski A.,Institute of Armament Technology
Journal of Applied Mechanics, Transactions ASME | Year: 2010

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.


Kumar R.,Institute of Armament Technology | Sawant K.,Institute of Armament Technology
Microwave and Optical Technology Letters | Year: 2010

This article presents the new ultra-wideband fractal antenna with CPW-fed.The fractal antenna has been fabricated on substrate Îμ r = 4.3 mm and thickness h = 1.53 mm with 15-mm radius. This antenna inscribed triangles in non-concentric circles with varied radius offers the excellent bandwidth around 13.54 GHz (span from 1.335 to 14.88 GHz) corresponding to 167% impedance bandwidth at S11 < -10 dB. The first resonant frequency of fractal antenna shifted to 1.51 GHz by the application of fractal geometry in comparison to solid circular disc monopole first resonant frequency 2.215 GHz. This indicates the size reduction of the antenna. The experimental radiation patterns of the antenna are nearly omni directional. The proposed antenna is useful for mobile communication and UWB communication system. © 2010 Wiley Periodicals, Inc.


Wisniewski A.,Institute of Armament Technology
Central European Journal of Energetic Materials | Year: 2013

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.


Kumar R.,Institute of Armament Technology | Sawant K.K.,Institute of Armament Technology
Microwave and Optical Technology Letters | Year: 2011

In this article, a novel inscribed square circular shape fractal antenna is proposed for UWB applications. The proposed antenna has been designed on FR4 substrate ηr = 4.3, h = 1.53 mm with the diameter 18.4 mm. The CPW-feed technique and the fractal concept have been used to achieve the ultra-wideband impedance matching and compact size. The experimental result of proposed fractal antenna exhibits the ultra-wideband characteristics from 3.01 to 15.0 GHz at VSWR 2:1 corresponds to 133.149% impedance bandwidth. The proposed antenna has also been studied experimentally with respect to each iteration. The measured radiation pattern of fractal antenna is nearly omnidirectional in azimuth plane and dumble shape in elevation plane. This antenna is useful for UWB communication System. © 2011 Wiley Periodicals, Inc.


Deng C.,Institute of Armament Technology
IEEE Antennas and Wireless Propagation Letters | Year: 2013

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.


Ampula D.,Institute of Armament Technology
Journal of Konbin | Year: 2015

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.

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