Verification of the Efficacy of the Special Water Shaped Charge Prototype (original) (raw)
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DESIGN OF A WATER DISRUPTOR FOR THE NEUTRALIZATION OF EXPLOSIVE DEVICES FOR THE MILITARY POLICE
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Computer simulation of detonation of shaped charge in sea water
The newly developed "GLUPTAK" mine disposal system is equipped with two axis articulated warhead that contains a purpose developed shaped charge. In practice, to make the idea of articulated head vehicle working, specific solutions are required. To meet these requirements shaped charge was designed to be effective against very close targets that mean ability to initiate detonation of a mine explosive. It assures that a distance required forming a projectile with velocity well above 4 km/s is minimized. While the charge was developed from scratch, computer simulation methods were used to optimize geometry of the charge components. General geometry (caliber), application of a metal lining, geometry of the lining and casing material was investigated to obtain high volume and high velocity of cumulation jet products. Due to specific application influence of water body around the charge was also studied. The simulation results were verified in life tests of the charge prototypes as well as in life operations against real mines.
Effect of liner material and explosive type on penetration effectiveness of shaped charge
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 2018
Shaped charges are used in many civilian and military applications. This study focuses on the effects of liner material and the type of explosive on the development of shaped charge jet. This was carried out by experimentation and numerical finite element-based modelling. Shaped charges were tested on a steel plate during the experimentation and the experimental data were used to validate the developed numerical model of the shaped charge. A hydrocode-based finite element model was able to predict the perforation and jet formation for the shaped charge, as well as the characteristics of the holes formed in the target plate. Several variations of the numerical model with the change of liner material and the filled explosive showed that the higher explosive resulted in higher velocity jet. The jet formation and velocity of jet were compared to determine the better performing combination of the material and explosive for the given shaped charge geometry. The underlying mechanisms were ...
Development of Special Explosive Charges for the Reconstruction of Unstable Damaged Buildings
WIT Transactions on The Built Environment, 2017
Buildings or properties seriously damaged due to detonation of explosives, gas explosions, technological accidents, and other emergency's threaten their surroundings with their instability. Their damage is usually so significant that no repair or reconstruction is ever considered, demolition is inevitable. In such hazardous situations, use of special charges could be the possible solution for a safe disposal of damaged and statically unstable structures. Use of this emergency pyrotechnic instrument could eliminate or considerably reduce the possibility of health hazards of intervening people, rescue equipment and surrounding properties during the disposal process of extremely damaged buildings in a very short time, mainly in neighbourhoods. A System of special sequentially timed charges use the increase of efficiency of external charges and cover with water-bags together with the increase of efficiency of the whole system due to their timing. Developed charges increase the operability and safety of rescue units of IRS (Integrated Rescue System).
THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS, 2016
The purpose of the paper is to investigate the influence of geometry of charges on the propagation of blast waves. Various shape charges (cylinder, sphere, irregular shape) were used in the field tests. The main type of explosive, homemade ANFO (Ammonium nitrate + fuel oil), was used as the most common used explosives in improvised explosive devices used in terrorist attacks. Characteristics of homemade and industrially made ANFO explosives are different. There were comparing charges of various types of industrially produced types of explosives and homemade explosive in the field tests. The blast wave propagation were investigated and compared.
On the Influence of Charge Shape, Orientation and Point of Detonation on Air-Blast Loadings
Structures Congress 2014, 2014
Charts in the UFC-3-340-2 design manual are used to compute peak incident overpressures and impulse generated by a detonation of an explosive as a function of scaled distance and angle of incidence. These charts assume either a spherical or hemi-spherical charge and do not account for the variation in charge shape, charge orientation and the point of detonation within the charge. A numerical study was performed using AUTODYN to study the influence of charge shape, charge orientation and point of detonation within the charge on the free-field overpressure distributions and the response of an A992 Grade 50 W14 × 257 column. A set of analyses was performed with cylindrical charges with different aspect ratios. Results were compared with those involving a baseline analysis of a spherical charge. The resulting peak incident overpressure and impulses, and the pressure contours were compared in the near-, mid-and far-fields. In the near-field, the overpressure distributions are influenced significantly by charge shape and the point of detonation in the charge. The influence of these variables diminishes with distance. The loading and subsequent response of the W14 × 257 column to a near-field detonation showed significant dependence on the charge shape and charge orientation and clearly demonstrated that SDOF assumptions are inappropriate for blast-resistant design against detonations of improvised explosive devices at small standoff distances.
WIT Transactions on the Built Environment, 2014
When the over pressure of a blast wave is calculated and its effects on valuated objects are set, many approximations are used. Basic relationships, used to calculate the maximum blast overpressure, safety distances and building damage, are created for industrial accidents or for objects where explosives and munitions are stored. This method is invalid in public spaces. More than 95% of all terrorist attacks are carried out using ANFO (ammonium nitrate-fuel oil) explosives in three different variants (ammonium nitrate with oil, ammonium nitrate with oil and aluminium powder or ammonium nitrate with oil and trinitrotoluene (TNT)).The commonly used method to calculate the overpressure uses a scaled distance. The value of the scaled distance is derived from heat created by combustion. A theoretical value for the combustion heat of an industrialproduced ANFO explosion does not represent the real history of explosion or the size of overpressure. For example, the heat of combustion of Slovak-produced DAP-E is the same as TNT. From the relationship used, it emerges that the explosions have the same capacity. We have conducted more than 130 field tests of the ANFO explosive, where the history of blast wave was recorded. The results of the measurements clearly show the invalidity of this theory. The values of the calculated and measured overpressure are significantly different. It is necessary to choose a different approach for the TNT equivalent method. In the first part of this paper, we present the results of the conducted field tests. The experimental results are analysed using commonly-used methods. At the end of our paper we present a new relationship, used to calculate the maximum blast overpressure, which is based on the measured overpressure. This paper presents the results of scientific research at the Faculty of Special Engineering, University of Zilina.
Development of a YAMUGAG-20 Wireless Exploder for Safe Disposal of Military and Civil Explosives
European Journal of Engineering and Technology Research, 2021
YAMUGAG-20 Exploder is a Radio Frequency (RF)-based wireless exploder system designed and constructed specially for the Nigerian Air Force (NAF) to overcome the challenges associated with the existing wired exploders used for the disposal of unserviceable ordnances. The Exploder system has three main parts namely, the master transmitter unit, the master receiver/slave transmitter unit, and the slave receiver unit. Each of these units is made up of transceiver module, microcomputer and power source. The microcomputers were programmed using C and C++ programming language of the Integrated Development Environment (IDE) software. The exploder is portable and easy to operate. For a typical demolition exercise, the operation of the exploder is such that signals are relayed from the master transmitter unit to the master receiver/slave transmitter unit onto the slave receiver unit to initiate an electric detonator leading to the detonation of the unserviceable ordnances. Functionality, rang...
Shaped Charge Calculation Models for Explosive Ordnance Disposal Operations
Journal of Military Studies, 2012
The clearance of unexploded ordnance (UXO) and other explosive remnants of war (ERW) containing shaped charge warheads poses a particular technical hazard to consider for explosive ordnance disposal (EOD) personnel. The wide use of light anti-tank weapons, such as rocket propelled grenades and the scattering of sub-munitions in different conflict areas have made the clearance of shaped charge ammunition a frequent task. However, unlike other hazards, for shaped charges, EOD personnel lack adequate means for the establishment of the maximum hazardous area and for the design of measures for hazard confinement against the shaped charge effect.In this article two different models are suggested, which together give guidance for protective measures during clearance of shaped charge ammunition. The development of these models is based on their military utility, by consideration of the limited information availability, the short time frames, the working methods and the technology level that...
Development of a YAMUGAG Wireless Exploder for Safe Disposal of Military and Civil Explosives
European Journal of Engineering and Technology Research, 2021
YAMUGAG-20 Exploder is a Radio Frequency (RF)-based wireless exploder system designed and constructed specially for the Nigerian Air Force (NAF) to overcome the challenges associated with the existing wired exploders used for the disposal of unserviceable ordnances. The Exploder system has three main parts namely, the master transmitter unit, the master receiver/slave transmitter unit, and the slave receiver unit. Each of these units is made up of transceiver module, microcomputer and power source. The microcomputers were programmed using C and C++ programming language of the Integrated Development Environment (IDE) software. The exploder is portable and easy to operate. For a typical demolition exercise, the operation of the exploder is such that signals are relayed from the master transmitter unit to the master receiver/slave transmitter unit onto the slave receiver unit to initiate an electric detonator leading to the detonation of the unserviceable ordnances. Functionality, range, power consumption, and system reliability tests were conducted on the exploder to establish its performance and efficiency. The results obtained from the tests indicated that the exploder transmitting at a frequency of 2.4GHz performed satisfactorily up to a range of 1000 meters. Therefore, the exploder has the potential of not only meeting the demolition demands of the NAF but can also be applied for other nonmilitary purposes like mining and related activities.