bluuebunny/crossref_metadata_2025_split huggingface dataset:
Advances in Disruptive Technologies of Ultrahigh-energetic Materials
Authors: Guiyu Zeng , Xiufang Qi , xiaobo Liu , Xi Zeng 
Published: January 2021

AbstractSince this century, disruptive innovating technology has developed rapidly and become a significant power of promoting science & technology development and military change, it will also affect energetic materials’ development profoundly. In order to realize the impact of disruptive technologies on energetic materials’ development, based on tracking the disruptive technology progress of energetic materials field at home and abroad, the disruptive technologies of ultrahigh-energetic materials has been reviewed, and the technological trends of metal hydrogen, all-nitrogen compounds, material genome and nuclear-energy are mainly analyzed, these disruptive technologies will greatly promote the innovative development of ultrahigh-energetic materials.
Numerical simulation on explosion shock wave overpressure produced by double charges
Authors: Qiu J L , Wang Sh Y , Jiang J W , Li M , Men J B 
Published: January 2021

Abstract
The influence of the number and spatial layout of charge on the overpressure was studied using numerical simulation. The 2-D axisymmetric models were established, considering that the pressure-time history of two equal-intensity shock waves is equivalent to that of shock waves reflected from a rigid surface. At the same position, the overpressures produced by single charge and double charges, which were installed with different included angles, were measured respectively. The results show that the overpressure produced by double charges increase significantly compared to that produced by single charge. With the increase of the included angle between double charges, the overpressure increases and reaches the maximum value when the included angle is 180°.
Effects of shell thickness on the fragment velocity distribution of D-shaped casing filled with explosive
Authors: Guo Zhiwei , Huang Guangyan , Liu Han , Zhang Peng , Feng Shunshan 
Published: January 2021

Abstract
Asymmetric casings filled with explosive have attracted increasing attention in the defence technology (e.g. innovative warhead design) and improvised explosive devices (IEDs) protection. As a typical asymmetric casing, D-shaped casing has been used in deformable aimable warhead, deployable aimable warhead as well as warhead in hypersonic weapons. To assist the design of asymmetric warhead, this work examined the velocity distribution of fragments from the bottom part of the D-shaped casing with different shell thickness. The fragment velocity distributions of the D-shaped casings with different shell thickness were numerically analyzed based on the SPH method. Numerical and theoretical analysis showed that there are opportunities to do optimization of shell thickness of D-shaped casings to maximum the utilization of the energy released by explosive. The findings herein could serve as a reference for further investigations on the fragment velocity distribution of D-shaped casings and provide a foundation for asymmetric warhead design.
Research on drop tower technology for simulating explosive impact load
Authors: Zhou Y B , Zhang M , Luo M , Wang X H , Sun X W , Liu Zh 
Published: January 2021

Abstract
When military vehicles are subjected to a mine blast, the vehicles will be damaged and the occupants will be injured. The main objective of this paper is to study the feasibility and accuracy of the drop tower to simulate the response of the vehicle body under the actual explosion condition. The equivalent damage method of impact waveform simulation was studied, and the feasibility of the equivalent damage principle of impact waveform based on change in velocity was verified. By analyzing a large number of data of simplified seat impact simulation, the mechanical model of the drop tower was analyzed. Through the correlation study of the parameters of the drop impact load, the relation formula of the drop height required by the target load was constructed, and the customization of the impact load was realized. The response simulation of the protective seat in the explosion was completed in the drop tower, which verifies the accuracy of the drop tower in simulating the explosion impact load. In addition, the results provide a good basis for the follow-up research.
Flight characteristics and mutual interference analysis of projectile launched in parallel
Authors: Zhu W F , Zhao N , Qu J , Wang Y W 
Published: January 2021

Abstract
Using the knowledge of computational fluid dynamics, a 3D simulation model of a 16 tube gun was established, and the process of muzzle flow field from single formation to mutual interference, stability and attenuation was simulated by solving N-S equations. Through the simulation analysis, it can be seen that the muzzle flow field formed by each barrel will influence and superpose each other when the multi-barrel gun is launched, and the lateral force caused by the asymmetric muzzle blast wave is acted on the projectile, and the lateral force of the middle four projectiles is small, the other 12 projectiles is larger. The results can be used as a reference for structural design, firing accuracy prediction and muzzle parameters test of multi-barrel launching weapon system.
Study on theoretical calculation of quasi-static pressure for aluminized explosive in confined space
Authors: Fan Xiao , Zhang Liansheng , Wang Xin 
Published: January 2021

Abstract
The process of the explosion damage in confined space mainly involves two parts, shock wave pressure effect and quasi-static pressure effect. A complicated afterburning reaction occurs in the internal explosion of aluminized explosives, not only enhancing the intensity of the shock wave, but also having a great influence on the final quasi-static pressure. A theoretical calculation model of final quasi-static pressure for aluminized explosive in confined space considering afterburning effect was proposed, based on the analysis of chemical reaction, the law of conservation of energy and the improved Jones-Wilkins-Lee equation of state. The factor that the volume of gaseous explosive products decreases in the afterburning reaction was also taken into consideration. The results of RDX-based and HMX-based charges calculated by the model were then analyzed and compared with the references’ experimental results as well as Anderson’s empirical formulas’ to verify the reliability and correctness of the proposed model. The results show that: the final quasi-static pressure of aluminized explosive calculated by the theoretical calculation model is in good agreement with the results of experimental measurement in the papers and the relative error doesn’t exceed 10%; the Anderson’s empirical formula is inapplicable to predict the final quasi-static pressure of the aluminized explosive in confined space. The study in this paper can provide a better theoretical calculation model to predict the final quasi-static pressure of aluminized explosives and provide some reference and guidance for the assessment of internal explosion damage of aluminized explosive and the design of explosive-resistant structures.
Research and engineering by REC “Mechanobr-technika” of additive technologies
Authors: Cherkasova M V , Samukov A D , Dmitriev S V , Mezenin A O 
Published: January 2021

Abstract
Demand for additive technologies and necessity for high-quality metal powders are growed. The results of technological research of finely dispersed powders was explored. This finely dispersed powders was gotten by vibration effects to produce conditioned commercial products that meet the requirements of additive technologies. This product can be used in powder metallurgy, mechanical engineering, processing metal waste. Research is observed of application of grinding metal waste from metal processing using the example of nickel cutting and the subsequent production of metal powders.
3D Printing and Characterization of Metamaterial Composite Structures for Absorbing and Shielding Electromagnetic Waves
Authors: Yin Lixian , Tian Xiaoyong 
Published: January 2021

Abstract
Electromagnetic (EM) absorbing and shielding materials possess critical position in defence field. However, traditional absorbing materials failed to achieve a wide absorption band because of the impedance mismatching between absorbing materials and air. And Traditional shielding materials, such as metals, failed to meet the increasing critical needs because of the large density, low corrosion resistance, difficulty in fabrication of complex structures. To solve these problems, a metamaterial composite structures with good performance on EM absorbing and shielding was proposed. The composite structure consists of a metamaterial absorber and a composite shielding structure. The metamaterial absorber is composed of graphene composite metamaterial whose impedance is gradually increased by tailoring the geometric parameter and graphene content. The shielding structure was prepared by continuous carbon fiber (CCF) reinforced composite. The composite structure was fabricated by multi-process 3D printing technology, with which different composites can be fabricated integrally without assembly. Experimental results showed that the absorption bandwidth of the composite structure was 32 GHz (4.5∼14.5 GHz, 17∼39 GHz), and the shielding effectiveness was larger than 63 dB. The excellent absorbing and shielding performance indicates that the composite holds great potentials in defense and that the design and fabrication method is useful for improving the defence survive ability in complex EM environment and fabricating EM functional structures cheaply, rapidly and facilely.
4D printing for continuous fibers reinforced composites
Authors: Wang Q R , Tian X Y 
Published: January 2021

Abstract
4D printing structure can be applied to the truss or the solar sail of spacecraft. At present, most 4D printing structures often have poor structural stiffness and deformation accuracy. In this study, a 4D printing process based on the composites with embedded continuous fibers is proposed. Due to the different thermal expansion coefficient and elastic modulus of fiber and resin, the structure will produce bending deformation when the temperature changes. The influence of fiber trajectories on deformation curvature is calculated and simulated, and then, some complex structures have been prepared by 4D printing process. The 4D printing structure of continuous fiber composite has better mechanical properties and higher deformation accuracy.
Design and Research of 2000T Wide Plate Tensile Testing Machine
Authors: Chen K Q , Zhang X G , Zhang L , Gu P , Zhang H W , Liu Ch 
Published: January 2021

Abstract
Wide plate, wide plate weld, pipeline girth weld and plate welded of panel used to the storage tank were wholly stretched by 2000T wide plate tensile test machine when using the related fixture. Tensile strength, initiation crack position of the joint crack, tolerance of the existing defects of welded joint, possibility of the crack propagation and fracture were studied. Their weak links were found, the formation of defects were avoided by welding technology and technical means. The closed loop control was realized by using advanced servo valve and high performance measure and control system, computer technology was used fully, multifunctional test control of the machine was realized. A number of servo cylinder precise synchronous control loading mechanism was adopted by 2000 T wide plate tensile testing machine, the design of its loading mode, servo cylinder, sensor installation layout and combined structure of super power sensor was the first in China, which created a platform for the development of large structure testing machine in the future.
High precision machining device for large-scale key parts of aluminum alloy
Authors: Chen H H , Meng F J , Zhang D S , Guo H B , Sang M , Qian D M 
Published: January 2021

Abstract
A high precision machining device for large scale curve groove of aluminum alloy key parts has been developed, the device is composed of a workpiece spindle drive system, a lathe bed, a hydraulic clamp system, a cutter spindle drive system, a deep feed shaft drive system, a linear feed shaft drive system, a data acquisition feedback system and a numerical control system, it improves the manufacturing precision and the whole strength and rigidity of the curve groove of the large aluminum alloy key parts, especially can be used for the whole precision machining of the curve groove of the high strength and high rigidity aluminum alloy key parts, and reduces the production cycle and cost, the key technical problems of cutting tool deformation and vibration control in NC milling and grinding wheel wear and correction in NC grinding are solved, it can meet the requirements of high-strength, high-rigidity and high-precision machining of large-scale aluminum alloy key parts.
The technology development direction analysis of the small portable unmanned ground platform
Authors: Liu X J , Su B , Yao Y A , Liu CH , Zhou L 
Published: January 2021

Abstract
The small portable unmanned ground platform, with its small size, small quality and diversity of mobile configuration, meets the functional requirements of individual soldiers carrying narrow space reconnaissance and detection tasks. As an effective complement to unmanned aerial vehicle and large unmanned platform, it becomes the end of execution of unmanned combat system, and plays an important role in promoting individual combat capability and improving the construction of unmanned combat system. In this paper, through the application of demand, the unmanned platform mission environment, development trend and key technology analysis to sort out the development platform to build micro unmanned technology framework for the subsequent step by step development of micro unmanned platform technology to provide technical support.
Design and Implementation of Trajectory Planning Algorithm for UAV Borne Air-to-Surface Missile
Authors: Yang Kai , Xu Chen , Xu Yan 
Published: January 2021

Abstract
This paper firstly introduces the development of domestic UAV borne air-to-ground missile guidance control systems and summarizes the current and ongoing research on the trajectory design of airborne missiles for unmanned aerial vehicles. Secondly, it introduces the traditional single-mode guided unmanned aerial vehicle air-to-ground missile trajectory design schemes and the new trajectory planning schemes for multi-mode compound guidance unmanned aerial vehicle borne air-to-ground missile. Finally, through mathematical simulation, it shows the characteristics of different trajectory schemes in terms of range, relative launch altitude and off-boresight capability.
Effect of graphene nano-platelet reinforcement on the mechanical properties of pressureless-sintered boron carbide
Authors: Li Z P , Gao X J , Lin G Q , Sun S L , Li K , Yang S Y , Fang S J , Zhang W , Zhang T , Wu Y C 
Published: January 2021

Abstract
Boron carbide (B4C) doped with graphene nano-platelet (GNP) as reinforcement has been prepared by pressureless sintering. Effect of GNP addition on mechanical properties of the composite, such as fracture toughness, hardness, flexural strength was investigated. Phase evolution and microstructure was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results demonstrated that addition of GNP improved the fracture toughness (KIC) of B4C with the decrease of hardness, flexural strength. The fracture toughness (KIC) can reach 4.45 MPam1/2 with 1wt% addition of GNP, which was 49.3% higher than that of the composite without graphene platelets. It was found that the toughening mechanism can be contributed to pulling-out of graphene platelets, crack deflection, bridging and branching.
Design of electronic control system for Z-pin four-axis numerical control implant reinforcement equipment
Authors: Chen H H , Meng F J , Zhang D S , Miao L Q , Guo H B , Du J , Sang M 
Published: January 2021

Abstract
Using the high-stability controller Delta AS324MT and the advanced high-precision servo system through the CANOPEN bus communication mode, the z-pin implantation is controlled with high precision and high efficiency, and the second encoder is applied to the qualifying mode to completely implement the closed-loop control of the qualifying length. Solve the technical problems such as the inaccuracy of the length and position, control the position precision and the precision of the implantation through the four-axis numerical control implantation method, and achieve the action control of the cutting by the joint pneumatic loop control. The actual test results show that this method improves the accuracy and efficiency of z-pin implantation, greatly saves the labor cost, and reduces the harm of manual implantation to the human body.
Study on Impact Resistance of Composite Reinforced Thin-Walled Tubes
Authors: Kuai Tengfei , Zhang Xianfeng , Chen Hejuan , Wang Jipeng , Ren Jie 
Published: January 2021

Abstract
In order to further improve the impact resistance of composite multi-cell thin-walled structures under axial loading, a new type of composite multi-cell sandwich tubular structure is proposed. Based on the MAT54 material model and the Chang-Chang failure criterion, a composite laminated shell modeling method was developed to simulate the failure behavior of the material under axial compression load and verified by quasi-static compression tests. The effectiveness of the simulation model is verified by comparing the parameters of peak load and specific energy absorption. The impact-resistance sensitivity of cell number and sandwich structure in composite multicellular structure was studied by this model. The results show that number of cells have a significant effect on the specific energy absorption of the composite multi-cell structure.
Near-explosion failure of elman neural network based on bootstrap
Authors: Zhao X , Liu S F , Ji Y X , Luo X B 
Published: January 2021

Abstract
In this paper, for the fuze of a certain type of fuze, there is a phenomenon that the fuze function of the fuze is invalid. The method of using the Bootstrap method to resample the experimental data, increase the sample size, and obtain the regular data, and use the back propagation neural network to establish the fuze near-failure learning model, and obtain a more accurate model by training the model. Test data is brought into the model and its accuracy is verified to ensure the accuracy of the model. It provides model support for the analysis of the weak condition of the fuze near-explosion function failure, and provides reference for the analysis of other fuzes.
The study on plastic flow behavior and constitutive model of h96 brass alloy under compression
Authors: Guo J H , Sun Y J , Liu Q , Ma Sh , Yang J W , Zhang X D 
Published: January 2021

Abstract
The plastic behavior of H96 brass alloy under a wide range of temperatures ranging from 20°C to 600°C and strain rates ranging from 0.01 s−1 to 6300 s−1 was studied by Gleeble-3500 simulator and split Hopkinson bar test. The results show that the flow stress increases with the strain and strain rate, while decreases with the temperature. The flow behavior is modeled by Johnson-Cook model and the parameters were obtained by regressions. The effect of strain rate and temperature on the flow stress was studied by modified JC model.
Fuzzy pid control of electromechanical actuator system
Authors: Li Cuicui , Yi Wenjun , Yin Hongqiao , Guan Jun 
Published: January 2021

Abstract
In order to meet the needs of modern high-performance aircraft, the fuzzy PID control strategy was used to design the electromechanical actuator control system. This control strategy combines the advantages of fuzzy control and PID control, and has better adaptability to time-varying complex systems. The electromechanical actuator control system adopted the three-loop structure, and current loop, speed loop and position loop were built on the platform of MATLAB / Simulink. Considering that the discrete universe fuzzy PID control algorithm has good real-time performance with small online computation, the fuzzy PID controller in discrete universe was designed in the position loop and the system was simulated. The simulation results show that the dynamic and steady performance of discrete universe fuzzy PID control is better than that of traditional PID control, and it is more suitable for electromechanical actuator system.
Matching research of the ammunition-feed system with the MBT overall performance
Authors: Wang Dongji , Yu Shasha 
Published: January 2021

Abstract
The ammunition-feed system (AFS) is one of the key systems of a MBT (Main Battle Tank), having general and much impact on the MBT overall performance. To assess the impact and technical level of AFS projects synthetically, accurately and quantifiably in order to choose the project according with overall requirements from many projects as well as possible, it is necessary to establish an index assessment system. In this paper, based on the analysis of the relationship between performance of the AFS and the MBT overall, an AFS’s matchability with the MBT overall concept is proposed, as well as the related assessment index. Taking the typical AFS in MBTs all over the world as the examples, AFS’s matchability with MBT overall is analyzed and evaluated through AHP (Analytic Hierarchy Process), which is a common system engineering methodology, and the application process of the index assessment system is displayed. In the end, the problems needing attention and advice during operation are given.
Tests of igniter’s charge position influence on ballistic parameters of artillery rounds
Authors: Plachá A , Hipnarowicz K 
Published: January 2021

Abstract
This paper presents a shooting test’s results of igniter’s charge position influence on ballistic parameters of artillery rounds. By igniter charge is meant black powder charge used to transmit ignition from igniter to propellant charge. For shooting tests 100 mm artillery rounds for BS-3 cannon, with NDT-3 18/1 and 15/7 propellants in different configurations of igniter’s charge position were prepared: igniter charge on the bottom of the metal case (A), igniter charge in the perforated metal tube, centrally located along the propellant charge (B), igniter charge in the end of lengthening metal tube, centrally located along the propellant charge, near to the bottom of the projectile (C). Moreover there were few configurations between igniter’s charge position and propellant charges: igniter charge in position A with NDT-3 18/1 propellant charge (1A), igniter charge in position B with NDT-3 18/1 charge (1B), igniter charge in position C with NDT-3 18/1 (1C), igniter charge in position A with 15/7 charge (2A) and igniter charge in position B with 15/7 charge (2B). During each shot the muzzle velocity of the projectile and the pressure of the propellant gases were measured. Obtained results were compared with each other and the conclusions were formed.