scholarly journals Investigation of Penetration Performance of Zr-based Amorphous Alloy Liner Compared with Copper

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 912
Author(s):  
Ping Cui ◽  
Deshi Wang ◽  
Dongmei Shi ◽  
Xinbao Gao ◽  
Jingqing Xu ◽  
...  
Keyword(s):  
Amorphous Alloy ◽  
Energetic Materials ◽  
Steel Plate ◽  
Energetic Material ◽  
Shaped Charge ◽  
Test Results ◽  
Depth Of Penetration ◽  
Military Industry ◽  
New Type ◽  
The Military

Zr-based amorphous alloy is a new type of metastable energetic material, which has been exploringly used to design shaped charge (SC) liners by scholars of the military industry. In order to know well how the stand-off distance influences jet penetration performance of liners made by such energetic materials against metal targets, SC static explosion tests were conducted under the same initiation and target conditions but different stand-off distances compared with copper liners. Test results indicate that the jet depth of penetration (DOP) of Zr-based amorphous alloy liners firstly increases slowly and then decreases sharply as the stand-off becomes larger. The optimum stand-off distance is 3.5 times of charge diameter (CD) and the corresponding maximum DOP is about 2.68 CD against the 45# steel plate. The perforation area varies with the stand-off distance. It reaches the maximum when the stand-off is 3.5 CD and the corresponding perforation diameter is about 42mm, also the penetration hole is nearly circular. The jet DOP of Zr-based amorphous alloy liner is smaller than that of copper liner’s while the perforation area is the opposite. The former DOP is about 55.7% of the latter and the former perforation area is about 2.8 times of latter when the stand-off distance is 3.5 CD.

The Conception of the Segmented Kinetic Energy Penetrators for Tank Guns

2010 ◽  
Vol 77 (5) ◽  
Author(s):  
Mariusz Magier
Keyword(s):  
Kinetic Energy ◽  
Penetration Depth ◽  
Steel Plate ◽  
Tungsten Alloy ◽  
Test Results ◽  
Axial Deformation ◽  
Review Of The Literature ◽  
Depth Of Penetration ◽  
Penetration Process ◽  
Firing Test

In this paper we present possibilities of increasing the depth of penetration through a steel plate by using segmented kinetic energy penetrators. Conclusions about the possibilities of increasing the penetration depth were formulated based on the critical review of the literature, simulations, and firing test results. A new concept called “forced segmented penetration,” where applied penetrator is composed of two tungsten alloy pieces connected by a screwed steel muff, is presented in this paper. The axial deformation of the connecting muff during the penetration process results in a decrease in the distance between tungsten segments. For this reason the rear segment can hit the front segment to give it some additional kinetic energy, enhancing the penetration depth. Such type of segmented penetration phenomena was not presented earlier. The numerical analyses of the segmented penetrator of the new design are presented in this paper.

scholarly journals Energetic Windmill: Computational insight into planar guanidine-based nitroazole-substituted compounds as energetic materials

2021 ◽  
Author(s):  
Jingru Li ◽  
Zujia Lu ◽  
Bokun Li ◽  
Hao Wu ◽  
Jiaxuan Wu ◽  
...  
Keyword(s):  
Detonation Velocity ◽  
Energetic Materials ◽  
Density Functional ◽  
Energetic Material ◽  
Molecular Surface ◽  
Frontier Molecular Orbital ◽  
Detonation Pressure ◽  
Planar Structures ◽  
New Type ◽  
Thermochemical Parameters

In this work, we designed a series of energetic materials with a windmill-like structure based on guanidine and nitroazole, and optimized them at the B3LYP/6-311G** level using density functional theory (DFT). According to the optimization results, 6 molecules with planar structures were screened out from 28 molecules and their regularities were summarized. We calculated their geometry, natural bond orbital (NBO) charge, frontier molecular orbital, molecular surface electrostatic potential, and thermochemical parameters. In addition, their properties such as density, enthalpy of formation, detonation velocity, detonation pressure and impact sensitivity are also predicted. The result shows that this series of compounds is a promising new type of energetic material, especially compound 1 has superior detonation velocity and detonation pressure (D=9720m/s, P=41.9GPa).

Numerical simulations of shaped charge jet penetration into concrete-like targets

2017 ◽  
Vol 8 (2) ◽  
pp. 237-259 ◽  
Author(s):  
Feng Hu ◽  
Hao Wu ◽  
Qin Fang ◽  
Jinchun Liu
Keyword(s):  
Penetration Depth ◽  
Constitutive Models ◽  
Shaped Charge ◽  
Standoff Distance ◽  
Depth Of Penetration ◽  
Whole Process ◽  
Jet Penetration ◽  
Metal Liner ◽  
Shaped Charge Jet ◽  
The Military

Shaped charge jet has been widely applied in the military and energy sources’ extraction fields; while the related investigations on the shaped charge jet penetration into concrete-like target are still limited, a series of numerical simulation works are conducted in this article. Holmquist–Johnson–Cook and Johnson–Cook models are used to describe the concrete-like targets and metal liner/casing of the shaped charge, respectively. The whole process including the formation, elongation in the air, and penetration into concrete-like target of shaped charge jet is reproduced using the multi-material arbitrary Lagrange–Euler algorithm and fluid–structure interaction method implemented in LS-DYNA. Simultaneously, the striking velocities of the jet (both tip and tail) and the damage of target (diameter and depth of penetration borehole) are derived. The above constitutive models, the corresponding material parameters, and the finite element algorithms are validated by comparing with the available tests’ data. The analyses of parametric influences are further performed. It indicates that for the unfragmented shaped charge jet, the penetration depth increases and the average penetration borehole diameter decreases with the standoff distance increasing, respectively; the compressive strength of concrete target has slight influence on the penetration depth of shaped charge jet; the diameter of shaped charge jet penetration borehole with aluminum liner is larger, while that with copper liner has a deeper penetration depth. It can also be found that the influence of explosive type on the penetration performance of shaped charge jet is negligible at small standoff distance, while the explosive LX-14 performs better than explosives Octol, B, and 8701 at larger standoff distance.

scholarly journals Numerical Analysis and Experimental Test for the Development of a Small Shaped Charge

2021 ◽  
Vol 11 (6) ◽  
pp. 2578
Author(s):  
Piotr Malesa ◽  
Grzegorz Sławiński ◽  
Karolina Pęcherzewska
Keyword(s):  
Structural Damage ◽  
High Efficiency ◽  
High Strength ◽  
Shaped Charge ◽  
Military Industry ◽  
Wide Range ◽  
The Subject ◽  
Universal Constructions ◽  
A Charge ◽  
The Military

Currently, shaped charges are widely used in many fields of science and industry. Due to the high efficiency of piercing materials with high strength and hardness, shaped charges are commonly used in mining, military and for structural damage. The main application area of shaped charges is the military industry, where they are used in missiles with warheads (torpedoes, rocket launchers) and for piercing vehicle armor or bunker walls. When analyzing the existing solutions of shaped charges, one can find many typical solutions designed for specific applications. However, there are no universal constructions which, after appropriate regulation, will fulfil their role in a wide range of applications. The subject of this article is a new solution for a shaped charge that is characterized by compact dimensions and a short preparation time. This article presents the results of experimental research and the numerical analyses of such a charge.

Introduction of the acylamino group to bridged bis(nitroamino-1,2,4-triazole): a strategy for tuning the sensitivity of energetic materials

2021 ◽  
Vol 45 (38) ◽  
pp. 18059-18064
Author(s):  
Dongxu Chen ◽  
Jiangshan Zhao ◽  
Hongwei Yang ◽  
Hao Gu ◽  
Guangbin Cheng
Keyword(s):  
Energetic Materials ◽  
Energetic Material

Introduction of the acylamino group into energetic material compounds will contribute to balancing the sensitivity and the energy.

scholarly journals Automated system for dispatching the movement of unmanned aerial vehicles with a distributed survey of flight tasks

2021 ◽  
Vol 30 (1) ◽  
pp. 728-738
Author(s):  
Dmitry Gura ◽  
Victor Rukhlinskiy ◽  
Valeriy Sharov ◽  
Anatoliy Bogoyavlenskiy
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Communication Systems ◽  
Data Exchange ◽  
Video Recording ◽  
Communication Technologies ◽  
Automated System ◽  
Military Industry ◽  
Communication Problems ◽  
Aerial Vehicles ◽  
The Military

Abstract Over the past decade, unmanned aerial vehicles (UAVs) have received increasing attention and are being used in the areas of harvesting, videotaping, and the military industry. In this article, the consideration is focused on areas where video recording is required for ground inspections. This paper describes modern communication technologies and systems that enable interaction and data exchange between UAVs and a ground control station (GCS). This article focuses on different architectures of communication systems, establishing the characteristics of each to identify the preferred architecture that does not require a significant consumption of resources and whose data transmission is reliable. A coherent architecture that includes multiple UAVs, wireless sensor networks, cellular networks, GCSs, and satellite network to duplicate communications for enhanced system security has been offered. Some reliability problems have been discussed, the solution of which was suggested to be a backup connection via satellite, i.e., a second connection. This study focused not only on the communication channels but also on the data exchanged between system components, indicating the purpose of their application. Some of the communication problems and shortcomings of various systems, as well as further focus areas and improvement recommendations were discussed.

Experimental Study on Shear Behavior of Perfobond Connector with Boot Shaped Slots

2019 ◽  
Author(s):  
Zhanchong Shi ◽  
Qingtian Su ◽  
Xinyi He ◽  
Quanlu Wang ◽  
Kege Zhou ◽  
...  
Keyword(s):  
Failure Modes ◽  
Shear Stiffness ◽  
Shear Capacity ◽  
High Shear ◽  
Test Results ◽  
Precise Location ◽  
Construction Problem ◽  
Circular Holes ◽  
New Type ◽  
Push Out

<p>In order to solve the construction problem of perforating rebars’ precise location and it’s getting through the circular holes for the the conventional perfobond connector, a new type of perfobond connector with boot shaped slots was proposed. This new type perfobond connector has the advantage of convenient construction and pricise location. Three groups of push-out tests with nine specimens were carried out to study the shear capacity of the new type perfobond connector. The effect of the number and the spacing of boot shaped slots on failure modes, shear capacity, peak slip and shear stiffness were mainly studied. The test results show that the new type of perfobond connector with boot shaped slots has a high shear capacity and a good ductility, it could be widely applied on the connection between the steel and the concrete structures.</p>

scholarly journals Olonets Metal Works as a Centre of Military Production in Russian Historiography

2021 ◽  
pp. 5-20
Author(s):  
Timofey V. Alekseev ◽  
Keyword(s):  
Diffusion Of Innovations ◽  
Industrial Complex ◽  
Military Industry ◽  
Military Industrial Complex ◽  
Organizational Experience ◽  
Production Experience ◽  
History Of ◽  
The Military ◽  
Military Production

The paper deals with the history of the Olonets metal works – one of the centres of military industry in pre-revolutionary Russia. It aimed to analyse the views of Russian researchers on the problems of military production at these plants and their role in providing the army and navy with weapons in the 18th – еarly 20th centuries. The works of the pre-revolutionary, Soviet, and post-Soviet periods were studied. The relevance of this research is substantiated by the need for an in-depth examination of such a phenomenon in Russian history as the military-industrial complex and its prototype represented by the military industry of pre-revolutionary Russia. The article is focused on the way Russian historiography presents the organization of military production at the Olonets metal works, their technical reconstruction in order to master the production of brand new types of weapons, as well as the role of foreign specialists and foreign technical, technological and organizational experience in this process. The study revealed some important features of the Olonets metal works operation: the use of the economy’s mobilization mechanisms for their creation, their role as a transmitter of military production experience to other Russian regions, the influence of non-economic factors on the existence of military industry enterprises, as well as the effect and significance of diffusion of innovations in military industry. It is concluded that the final period in the history of the Olonets metal works (late 19th – early 20th centuries) is poorly reflected in Russian historiography. In addition, the research points out the need for a comprehensive work on the history of military production at the Olonets metal works in general.

scholarly journals DUKUNGAN KELUARGA TERHADAP TINGKAT KESEMBUHAN PASIEN COVID-19 DI RUANG ISOLASI RUMAH SAKIT AMINAH 2021

2021 ◽  
Vol 7 (2) ◽  
pp. 164-169
Author(s):  
Agah Nugraha ◽  
Rostime Hermayerni Simanullang
Keyword(s):  
Family Support ◽  
Virus Disease ◽  
Sampling Technique ◽  
Statistical Test ◽  
P Value ◽  
Test Results ◽  
Raising Children ◽  
The Family ◽  
New Type

 Corona virus Disease 2019 (COVID-19) is an infectious disease caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). SARS-CoV-2 is a new type of coronavirus that has never been previously identified in humans. Family support is an activity oriented to improve family functions on the basis of raising children and other family activities. in a system and resources that support. This study aims to identify family support for the healing rate of Covid-19 patients in the Isolation Room at Aminah Hospital, Tangerang in 2021. Method: observational analytic used in this research and 23 covid-19 participantn,  in this study using the Total Sampling technique. Statistical test used is the Spearman Rank statistical test. Results: The results of study obtained p value = 0.000 <0.05. Conclusion: there is a relationship between family support and the healing of  Covid-19 patients.  The role of the family is very important. and breaking chain of spread of the Covid-19.

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