Armament Research and Development Establishment

Pune, India

Armament Research and Development Establishment

Pune, India
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Dhote K.D.,Armament Research and Development Establishment | Verma P.N.,Armament Research and Development Establishment
Procedia Engineering | Year: 2017

Protective structures against hypervelocity impact of fragments consists of a thin skin (bumper plate) followed by air gap and main structure. The bumper causes shattering of the fragment and reduces fragment penetration capability to the main structure. Hole size formed in the bumper plate is indicative of damage extent to the main structure and is a direct measure of exposure to new impacts. An extensive study for characterization of hole size in thin aluminium plates due to hypervelocity impacts of aluminium projectiles has been reported in literature. An empirical equation is generally used to estimate the hole size which depends on non-dimensional parameters relating the target and projectile geometry, material and impact conditions, and constants of the equation needs to be determined for a given problem. The authors have investigated the hole size formation for steel sphere impacting thin steel target with velocity ranging from 2 km/s to 4 km/s and obliquity between 0°and 70°. The constants for a prototype non-dimensional empirical equation for hole size have been determined using hydro-code simulation and a few experiments have been conducted to validate the predictions. © 2017 The Authors.


Roy A.K.,Armament Research and Development Establishment | Lankennavar P.H.,Armament Research and Development Establishment | Ghadge V.S.,Armament Research and Development Establishment
Defence Science Journal | Year: 2017

The basic principle of war is based on protection, mobility and firepower. The present scenario of omnidirectional and multidisciplinary threats and decreasing response time has made intelligence inevitable for the system to survive and win the war. The intelligence of the system calls for interface of refined logic with systems without compromising any parameters of the gun. However, much of the efforts and funds are directed towards developing the newer technologies to enhance the performance of weapon system in terms of accuracy, consistency, range (stand-off), lethality and transportability. The efforts are also directed towards making smart weapons controlled distantly and cost effective. The future battlefields are going to be dominated by the technological advancements taking place and thus, the technological superiority (i.e. systems with high degree of intelligence) over the adversaries will be the deciding factor to win the war.


Dhote K.D.,Armament Research and Development Establishment | Verma P.N.,Armament Research and Development Establishment
Thin-Walled Structures | Year: 2016

Protective structures against hypervelocity impact of fragments consists of a thin skin (bumper plate) followed by air gap and main structure. The bumper causes shattering of the fragment and reduces fragment penetration capability to the main structure. Hole formed in the bumper plate is indicative of damage extent to the main structure and is a direct measure of exposure to new impacts. An extensive study for characterization of hole in thin aluminium plates due to hypervelocity impacts of aluminium projectiles has been reported in literature. Empirical equations are generally used to estimate the hole size which depends on non-dimensional parameters related to the target and projectile geometry, material and impact conditions, and constants of the equation needs to be determined for a given problem. The authors have investigated the hole formation for steel sphere impacting thin steel target with velocity ranging from 2 to 4. km/s and obliquity between 0° and 70°. The constants for a prototype non-dimensional empirical equation for hole formation have been determined using hydro-code simulation and a few experiments have been conducted to validate the predictions. © 2017 Elsevier Ltd.


Rawal B.,Armament Research and Development Establishment | Wathore N.N.,Armament Research and Development Establishment | Praveenkumar B.,Armament Research and Development Establishment | Panda H.S.,Indian Defence Institute of Advanced Technology
Journal of Materials Science: Materials in Electronics | Year: 2017

The study highlights the effect of donor (Sr2+) and acceptor (Zr4+) co-doping on phase formation, microstructure, density, ferroelectric, dielectric, piezoelectric, fatigue and aging properties of (Na0.52 K0.48)(Nb0.95 Sb0.05)O3, abbreviated as NKNS, lead free piezoelectric ceramics. The composition (1–x)(NKNS)—xSrZrO3 (where x = 0.0, 0.02, 0.04, 0.06 and 0.08) were synthesized by mixed oxide route. The doping drastically affected the phase formation and the microstructure. The poling studies suggested that the material requires higher poling temperature (120 °C) for optimum properties. At the small concentration of SrZrO3, the dominant effect of acceptor doping induced ‘hybrid’ piezoelectric behavior which improved fatigue, ageing and piezoelectric properties. The mechanical quality factor (Qm) more than doubled (96) and piezoelectric charge co-efficient peaked to 157 × 10 −12 C/N for 2% SrZrO3. The study of Raman spectra ascertained that the doping influenced the nature of B–O bonding. The electrical fatigue behavior in conjunction with ferroelectric studies confirmed that due to complex doping different mechanisms work to stabilize the polarization state which influenced the ageing and fatigue behavior. © 2017 Springer Science+Business Media, LLC


Dhote K.D.,Armament Research and Development Establishment | Murthy K.P.S.,Armament Research and Development Establishment | Rajan K.M.,Armament Research and Development Establishment | Sucheendran M.M.,Indian Defence Institute of Advanced Technology
International Journal of Impact Engineering | Year: 2015

Spatial dispersion of a Fragment Generator Warhead (FGW), in terms of projection angle and velocity, is essential to focus the maximum number of fragments on the target missile for effective neutralization. The authors carried out experiments to study the fragment dispersion in single, double and triple layered FGW configurations with tungsten alloy fragments. The projection angle and velocity are estimated by capturing the fragments in straw boards panel and correlating their position on the FGW. The paper presents the explanation of the phenomenon of fragment dispersion and deformation using one dimensional shock theory. © 2014 Elsevier Ltd. All rights reserved.


Sudarsan N.V.,Armament Research and Development Establishment | Das S.K.,Indian Defence Institute of Advanced Technology | Naik S.D.,Armament Research and Development Establishment
Propellants, Explosives, Pyrotechnics | Year: 2016

Determination of propellant formulation by ballistic requirement is an important area of research in recent times. In this study, a theoretical method for the design of gun propellant formulation using primary data of ingredients and necessary thermochemical properties of the resultant propellant was established. The employed method is based on a mathematical model of thermochemical properties of the propellant by optimizing the heat of explosion of the propellant using the fmincon tool in MATLAB. A graphical user interface (GUI) based code was generated and developed for the formulation design of solid gun propellants. The designed code was verified by available data in the literature. Such code will be useful to the researchers working in the area of high energy materials for the design of unknown propellant compositions. Further, it can be extended to redesign the existing propellant formulation in order to enhance the ballistic performance. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Parkhi P.,Armament Research and Development Establishment | Bandyopadhyay B.,Indian Institute of Technology Bombay | Jha M.,Armament Research and Development Establishment
Proceedings of the 2010 11th International Workshop on Variable Structure Systems, VSS 2010 | Year: 2010

Sliding mode design based on Lyapunov matrices is proposed as roll autopilot for a tail controlled missile. The search of Lyapunov matrix for systems with unmatched uncertainties is formulated in terms of linear matrix inequality. The proposed scheme ensures robust roll position control even in the presence of large mismatched parametric uncertainties and external disturbances. The performance of roll autopilot design based on sliding mode technique is compared with the classical autopilot. The simulation results demonstrate that the sliding mode based roll autopilot maintains its performance over wide range of variation of parameters. © 2010 IEEE.


Vummadisetty P.N.,Symbiosis International University | Kumar R.,Armament Research and Development Establishment
Turkish Journal of Electrical Engineering and Computer Sciences | Year: 2016

Two CPW-fed compact printed slot antennas for UWB applications are proposed in this paper. In both antennas, the slot in the ground plane is of octagonal shape, while the patch is rectangular in one of the antennas and hexagonal in the other. Thin metallic stubs of different lengths are added to the ground plane and protrude into the slot. These stubs help to improve the impedance matching over a broader bandwidth. The antennas are very compact in size and designed on low-cost FR4 substrate. The measured impedance bandwidths (S11 < -10 dB) achieved by the rectangular and hexagonal patch antennas are from 3.1 GHz to 5.6 GHz and 3.14 GHz to 5.34 GHz, respectively. The slot antenna with hexagonal patch is further modified to have dual-band characteristics. An L-shaped stub is attached to the ground plane to achieve an additional band from 2.45 GHz to 2.52 GHz for WLAN applications. The radiation patterns of the antennas are dumb-bell shape in the E-plane and omnidirectional in the H-plane. Detailed parametric studies of the antennas have been carried out. The simulated results are found to be in good agreement with the measured results. © 2016 Tübitak.


Rajan K.M.,Armament Research and Development Establishment
Proceedings of the 10th International Conference on Technology of Plasticity, ICTP 2011 | Year: 2011

Electro Slag Refined (ESR) AISI 4130 steel performs with fully tempered martensite microstructure having fine grain size of ASTM 7-8 have been used as the input material for a 3-pass reverse flow forming process for manufacturing high strength thin wall pressure vessel for a critical application. The forming machine parameters such as roller feed, spindle speed and roller stagger were experimentally fine tuned to achieve desired level of out of roundness and straightness of the finished flow formed tube for practical application. Heavily cold-formed thin wall tubes are likely to develop considerable residual stresses due to non-uniform deformation. Residual stresses can lead to failure of a component by buildup of stresses or by enhancing susceptibility to failure by mechanisms such as fatigue. Hence it is considered essential to measure the residual stress on the flow formed tube by x-ray diffraction technique. The measured residual stresses are quantified. A suitable sub-critical annealing process has been evolved and the flow formed tubes were subjected to the same. Residual stresses were measured again at the same locations and its magnitude was found to be negligible. The geometrical tolerances were found to be unaffected after the stress relief operation and hence a 3 pass forming followed by subcritical annealing has been followed for manufacture of large number of tubes. © 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).


Harikrishnan S.,Armament Research and Development Establishment | Murthy K.P.S.,Armament Research and Development Establishment
Defence Science Journal | Year: 2010

Tandem shaped charge warhead is one of the efficient methods to defeat the explosive reactive armour (ERA) protected main battle tanks (MBT). In this concept, two shaped charges mounted in the same missile are initiated one after the other with certain time delay. First shaped charge jet would remove the ERA and the second jet would penetrate the bare armour. Both these explosive charges are mounted close to each other most of the time due to severe space constraints in the system. It is necessary to protect the second charge from the blast effects of first charge, during the time delay between the initiations of two charges. Blast effect of precursor charge on main charge is understood to have detrimental effects on the performance of warhead system.This paper presents a case study of an investigation into the inconsistent performance of a tandem warhead for a third generation antitank missile. The warhead generated a crooked jet resulting in inconsistent penetration performance. Typical crater profiles were observed when the penetration performance deteriorated. Systematic analysis was carried out and simulations were performed using Autodyn-3D to reproduce the phenomenon. Experiments were conducted using Flash X-ray which substantiated the assumptions made for simulation studies. © 2010, DESIDOC.

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