bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fabrication and Mechanical Properties of FeAl Metal-Intermetallic Laminated (MIL) Composite
Authors: Lu Xiaonan , Wang Yu , Peng Xiangfei , Zhao Wenjuan , Xu Hong 
Published: June 2023

Abstract
With the rapid development of science and technology, the requirements for material performance in fields such as defense and military industry are getting higher and higher, and it is becoming more and more difficult to meet multiple performance requirements with a single material at the same time. Inspired by the special structure of shells, Metal-Intermetallic-Laminated composites (MIL) with composite, low-cost, and multifunctional properties have been prepared to combine the performance advantages of each component to achieve properties that cannot be achieved by a single material. In this paper, Fe/FeAl laminated composites were prepared by stacking pure Fe foil and pure Al foil alternately and using a vacuum hot-pressure sintering process to first consume all the Al layers by reacting at 655°C for a period of time, and then ramping up to 950°C for high-temperature annealing with different holding times. The microstructure and phase composition were analyzed by SEM and EDS, and the static and dynamic compressive strength and failure strain of the laminated material were measured by a universal testing machine and Hopkinson rod.
Effect of Pb on microstructure and mechanical properties of Tin Babbitt alloy
Authors: Ren Xiaoyan , Chen Ningning , Zhang Guowei , Xu Hong , Zhang Yougui , Shi Zhenhua , Zhaojie Wang , yijun Liu 
Published: June 2023

Abstract
This paper mainly studies the microstructure and properties of babbitt alloys, and analyzed the influence of lead on the microstructure and properties of the alloys by adding alloying element Pb, The results show as follows:with the increase of Pb content, the hardness of ZSnSb11Cu6 alloy first increases and then decreases. The maximum at 0.75% is 26.96HB. The tensile strength and elongation showed a trend of rising, then falling and then rising, and the mechanical properties were relatively high at 0.35%.The addition of Pb changes the morphology of Cu6Sn5 phase. With the increase of lead content, the β phase decreases and then grows, and the needle-like η phase dendrite grows.
Study of Sparse Terahertz Synthetic Aperture Imaging Algorithm
Authors: Wang Ningbo , Qi Feng 
Published: June 2023

Abstract
For the terahertz synthetic aperture near-field imaging problem, this paper proposes a SAR imaging method based on sparse reconstruction, which solves the problems of slow scanning speed, a large amount of data, and complicated calculations in the terahertz synthetic aperture imaging process. The targets in space are sparsely sampled and reconstructed using a compressed sensing reconstruction method. Simulation results show that high-quality target reconstruction can be achieved at low sampling conditions.
Pre-control of shell expansion fracture process by high energy beam
Authors: Xin Bi Wei , Bing Li Wei , Luo Yu Song , Xin Yu Jia , Bin Li Wen , Wang Xiao Ming 
Published: June 2023

Abstract
Aiming at the dynamic deformation and fracture response of high-energy precontrolled shell under high strain rate,the expansion and fracture process of 40CrMnSiB steel precontrolled shell was studied by numerical modeling and experiment.The results show that:In detonation loading condition,the high energy beam precontrol shell expansion fracture process can be divided into three stages of free expansion,precontrol fracture and matrix fracture.Firstly, the brittle fracture occurs in the fusion region, and the crack starts at the bottom of the cavity region and propagates along the fusion region to the outer wall of the shell. After the brittle fracture is completed, the adiabatic shear fracture occurs in the matrix, and the normal line between the fracture surface and the inner wall of the fragment is 45 °.The recovered fragment shape is in the shape of precontrolled quadpyramid,and the fragment quality is concentrated in the precontrol area. the fragment dispersion has a good distribution law,which better verifies the pre-control effect of high-energy beam pre-control technology on the fragment shape and the direction of dispersion,and provides technical reference for further optimization of high-energy beam pre-control warhead structure.
Ignition sensitivity and flame propagation of titanium powder cloud
Authors: Wang Y X , Zheng C , Han J L , Huang W M , Zhang Q X , Zhao J B , Wang X , Chen X H , Yang X Y 
Published: June 2023

Abstract
The ignition sensitivity and flame propagation of titanium dust cloud were investigated to evaluate the risk of combustion and explosion of titanium powder. The minimum ignition temperature(MIT) was determined by Godbert-Greenwald furnace and the minimum ignition energy(MIE) was determined by Hartmann apparatus. The flame propagation behavior in the Hartmann apparatus was recorded by high-speed camera and infrared thermal imager. The results show that the spherical titanium powder with a median diameter of 12.5μm had a minimum ignition temperature of 400°C, a minimum ignition energy of less than 1mJ, and a maximum flame temperature of 1666°C. The dust concentration had a greater influence on the minimum ignition temperature than the dispersion pressure, titanium dust cloud had high ignition sensitivity and fast flame propagation speed. The experimental results can provide a reliable basis for judging the explosive risk of titanium powder.
Study of armor-piercing self-sharpening properties of 88WC-12Co material
Authors: Yin G X , Zhang Q , Chen P , Hong B H , Jiang N , Gao D C 
Published: June 2023

Abstract
In this paper, the armor piercing power of 93W-4Ni-3Fe and 88WC-12Co with the same target velocity and core size is compared through experiments. The craters formed by the penetration of the same size projectile core made of 88WC-12Co and 93W-4Ni-3Fe into the semi-infinite Q235 steel target at the velocity of 1300 m/s–1500 m/s were compared. The penetration depth of 88WC-12Co is 12.5% –35% lower than that of 93W-4Ni-3Fe ( including residual projectile core ), and the pore size is about 12%–26% smaller. At the velocity of 1300 m/s-1480 m/s, there are more residual projectiles at the bottom of 93 W projectile pit. When the velocity is higher than 1510 m/s, the residue is less and the utilization rate of core material is higher. The aperture caused by the penetration of 88WC-12Co projectile core is slender and smooth, and the residual at the bottom of the crater is less than 93W. This proves that 88WC-12Co material has certain armor piercing self-sharpness. It is speculated that 88WC has a similar or even higher penetration ability to 93W when the initial kinetic energy of the two cores is the same.
Simulation and experimental study of fragment penetration into armored steel plate
Authors: Zhang Wen-juan , Yang Xu , Tan Kun , Zhang Cun-wang , Liu Zun-fei , Liu Hou-gang , Li Jun-lin 
Published: June 2023

Abstract
In order to study the penetration ability of fragment simulation projectile(FSP) to armored steel target, and to detect the protection ability of target plates with different thicknesses. Combined with numerical simulation and experiment, the penetration process of FSP on armored steel target plates with different thickness ratios is studied. The design and implementation preparations were made for the damage of the steel target plate by the fragments, and the relevant data were obtained and analyzed. The analysis results show that the finite element analysis and the experimental study are in good agreement, and the ballistic limit of armored steel targets with different thicknesses and the calculation formula of the residual velocity of the FSP are obtained. The research results provide the basis and support for the evaluation, design and improvement of armored vehicle protection capability.
Experimental investigation of blast resistance of steel structures with different elastomeric coatings subjected to underwater explosive loading
Authors: Dai Lihui , An Fengjiang , Wu Cheng 
Published: June 2023

Abstract
Elastomeric material is used as blast-resistant structure because of its good mechanical properties.A series of underwater near-field explosive tests at different standoff distances were conducted to investigate the anti-explosion performance of steel structures covered with rubber and polyurea coatings. The experimental results demonstrated that both rubber and polyurea could enhance the blast resistance of test plates, and the polyurea coating performed better in reducing the deformation of steel plate and damage of steel structure. Compared with rubber, the polyurea has excellent mechanisms of energy absorption and dissipation, its mechanical behavior and molecular structure of elastomeric material determines the different ways of energy absorption and dissipation.
Study on damage law of projectile charge penetrating three-layer steel plate
Authors: Qu kepeng , Hu Xueyao , Bi chao , Guo Xiang , Xiao Wei 
Published: June 2023

Abstract
Aiming at the problem that the projectile charge is easy to be damaged when penetrating multi-layer targets, which affects the safety of use, the light gas gun was used as the loading source to carry out the experiment of projectile penetration into single-layer, two-layer and three-layer 45# steel plates. The damage states of projectile charge were obtained by industrial CT technology. Combined with the numerical simulation results, the formation and evolution mechanism of projectile charge damage was analyzed. The results show that when the projectile charge penetrates the three-layer steel plate at an angle of 15 ° at the speed of 400m / s, the charge damage appears after penetrating the second layer steel plate, and mainly occurs at the tail of the charge. When penetrating the third layer steel plate, the damage expands along the axial and transverse direction; The tensile wave formed by the reflection of the free surface at the tail of the charge is the main reason for the formation of damage. The repeated action of compression and tension of the charge leads to the continuous evolution and expansion of cracks.
The fragments distribution of the nonaxisymmetric directional-focusing warhead
Authors: Li Xiang , Huang Guang-yan , Guo Zhi-wei , Feng Shun-shan 
Published: June 2023

Abstract
Charge structure, which can instantly release much energy, is a significant research point in explosive protection and warhead. A nonaxisymmetric directional-focusing warhead based on a quadrangular charge structure was designed, and the distribution of fragments from the warhead involved was studied. Numerical calculation research was carried out based on the ABAQUS finite element calculation software. The witness targets of fragments were obtained from an equal-scale explosion experiment, which provided experimental support for numerical simulation research. The results show that the nonaxisymmetric directional-focusing charge structure has a coupling effect on the directional and focusing of the fragments, and the fragments can form a concentrated damaging area. In this paper, the fragments distribution of the nonaxisymmetric directional-focusing warhead was obtained, and the damaging effect of the warhead involved was verified, which provides a foundation for the design and application of the nonaxisymmetric directional-focusing warhead.
An experimental and numerical study on the ballistic performance of a lightweight ceramic composite armor
Authors: Dong Gaoxiong , Li Xiangdong , Ji Yangziyi 
Published: June 2023

Abstract
In this paper, the ballistic limit velocity of 12.7mm armor-piercing incendiary projectile impacting a typical lightweight ceramic composite armor made of boron carbide ceramic and multi-layered composite materials (carbon fiber/aramid fiber/ultra-high molecular weight polyethylene fiber) was obtained experimentally. The process of impact was numerically simulated by the FEM-SPH method, and the results pointed out the characteristics of the penetration and the energy dissipation rule of each component of the ceramic composite armor. On this basis, the influence of thickness changing of the carbon fiber core layer on the ballistic performance of ceramic composite armor was studied with a typical “sandwich” structure, and the results showed that: when the thickness ratio of ceramic tile to the backing panel is about 1.5, the thickness changing of the carbon fiber core layer has the greatest effect on the ballistic performance. Under this thickness ratio, when the ratio of ceramic tile thickness to bullet diameter is greater than 1, the increase of carbon fiber core layer thickness will cause the ballistic performance index (BPI) of the target to decrease while the ratio is less than 1, the BPI increases or holds at first, and then decreases.
Penetration behavior of reactive projectiles impacting TC4 plates
Authors: Yuan Ying , Liu Aoxin , Xie Jianwen , Yu Qingbo 
Published: June 2023

Abstract
The reactive projectile presents a tremendous potential to induce the combined damage effect of kinetic energy and chemical energy to the plate. A series of ballistic impact experiments and numerical simulation studies were carried out to study the penetration behavior of reactive projectile against TC4 plate. The experimental results showed that with the impact velocity of the reactive projectile increasing from 537m/s to 682m/s, the damage mode of the plate gradually changes from bulge, cross crack to plug. According to the experimental results, the ballistic limit velocity of reactive projectile perpendicular penetrating 5mm TC4 is 648.33m/s. The numerical simulation results showed that the reactive projectile reaches GPa high pressure within a few microseconds when it impacted with the plate. During reactive projectile penetrating TC4 plate, the chemical energy release significantly improves the projectile penetrating ability, and the contribution of chemical energy to projectile penetrating can reach 55.07%.
Research on numerical simulation of submunition dispenser under different dispersion state
Authors: Shi Z , Wang S Y , Kang H B 
Published: June 2023

Abstract
In order to study the process of submunition airbag dispersal under different dispersion state, the p-t curve of gas generator combustion obtained by closed bomb test was transformed into the mass flow rate-time curve to simulate the process of airbag inflation. As the initial condition, it was input into the finite element model of submunition dispersal established by LS-DYNA software, and the results were compared with the literature data to verify the accuracy of the calculation method. Then, through the numerical simulation of airbag dispersion of submunition with different centroid positions and initial placement angles, the simulation results show that the dispersal velocity of the submunition decreases with the increase of the offset of the centroid in the x direction and the placement angle. The peak overload decreases with the increase of centroid offset and placement angle. The angular velocity of the submunition rotating around the y axis increases with the increase of the offset of the centroid in the x direction; the velocity of submunition rotating around x axis increases with the increase of the offset of centroid in y direction.
The penetration performance and matching design method of tandem warhead against ultra-high strength concrete
Authors: Si Xuena , Yu Rui , Wang Ping , Ji Long , Yu Wanqian , Li Rui , Liu Rongqiang 
Published: June 2023

Abstract
The penetration performance of the tandem warhead against ultra-high strength concrete and the matching relationship between the precursor shaped charge and the following kinetic energy warhead of the tandem warhead are researched to enhance the damage effect. For the precursor shaped charge, the formation and penetration properties of jet are studied in a combined experimental and numerical way. The value of kinetic energy/target borehole volume of C130 ultra-high strength concrete under the penetration of titanium alloy jet is obtained and the relationship of the depth and diameter of the precursory penetrating cavity is developed. For the following kinetic energy warhead, the numerical simulation of penetrating the pre-damage C130 ultra-high strength concrete is carried out and significant influence of the pre-damage crater’s depth and diameter on the relay penetration depth is observed. The matching method for the pre-damage crater resulting from the precursor shaped charge and the follow-through depth of the following kinetic energy warhead is set up on the basis of obtained penetration rules of two stages, which could provide helpful reference for the preliminary fast design of tandem warhead against ultra-high strength concrete.
Influence and its Mechanism of Non-reactive Fillers on the Dispersion Characteristics of the Fragments from Charge Structures
Authors: Liu Han , Zhao Yao , Guo Zhi-wei , Huang Guang-yan , Feng Shun-shan 
Published: June 2023

Abstract
With the diversified development of innovative warheads and the increasing threat of improvised explosive devices (IEDs), the charge structure filled with both explosives and non-reactive materials has attracted the attention of researchers, which is few studied. In order to obtain the fragmentation of the charge structure with part of the non-reactive filler, the X-ray radiography explosion experiment was carried out for an axisymmetric charge structure partially filled with nylon that serves as a typical non-reactive filler. The fragmentation and fragment dispersion characteristics of the charge structure were observed. Based on the results of X-ray experiments, the influence mechanism of shell breakage and fragment dispersion characteristics of the charge structure filled with non-reactive filler are analysed by using SPH numerical calculation method. The results show that the non-reactive filler will significantly affect the fragmentation of the shell and considerably reduce the fragment velocity of the fragments in the filling direction. However, the fragment dispersion direction of the charge structure is not affected by the non-reactive filler. The conclusions could be a foundation and reference for further research on new charge structures.
Improvement of high-power thyristor trigger circuit with switching-mode power supply for differential-mode noise reduction
Authors: Wei Jiufu 
Published: June 2023

Abstract
This paper focuses on the differential-mode (DM) noise of high-power thyristor (HPT) trigger circuit with switching-mode power supply (SMPS) in capacitive pulsed power supply (CPPS). Parasitic parameter models of components are discussed and analyzed. Based on the parasitic parameter models of components, a DM noise prediction model of HPT trigger circuit with SMPS is developed. The generation mechanism and propagation paths of the DM noise in HPT trigger circuit with SMPS are investigated. To reduce the DM noise, a capacitive SMPS technique is adopted in the HPT trigger circuit with SMPS. Simulation results validate the theoretical analysis.
Research on electromagnetic coupling characteristics of UAV circuits in the Complex electromagnetic environment
Authors: An Yashuai , Pan Xuchao , He Yong , Fang Zhong , Zheng Zhikai , Hao Yu , Du Wei , Zhou Yu , Chang Geng 
Published: June 2023

Abstract
The overall circuit model and Complex electromagnetic environment model of a typical UAV are built to explore the survivability of multirotor in the complex electromagnetic environment. The composite theoretical calculation model of the metal cavity aperture coupling and internal circuit coupling is constructed using the established UAV circuit model, which is based on the equivalent magnetic dipole algorithm and the FDTD algorithm. The terminal coupling voltage in the UAV circuit and the electromagnetic field distribution inside the metal cavity are estimated. CST software is used to simulate the response of UAV circuits in the same condition, and the correctness of the theoretical calculation model is confirmed. Then, the terminal coupling voltage of the PCB is used to create an electromagnetic coupling efficiency model. The findings reveal that the constructed composite theoretical model can accurately characterize the electromagnetic coupling characteristics of UAV circuits in the complex electromagnetic environment, with an error range of 1%~8%. When comparing the terminal coupling voltage of PCB in various complicated electromagnetic environments, the High-power microwave (HPM) has the maximum coupling efficiency. HPM initially causes the UAV circuits to attain the damage threshold under identical event conditions and target specifications. The findings could be used as a guide for multirotor circuit board protection in the complex electromagnetic environment, as well as for the development of high-power electromagnetic pulse weaponry.
Numerical Simulation of High Power Microwave Coupling to Typical Individual Inertial Device
Authors: Zheng Zhikai , Pan Xuchao , An Yashuai , Hao Yu , Du Wei , Zhou Yu , Chang Geng , Wang Siwei 
Published: June 2023

Abstract
HPM (high-power microwave) weapons become the major threat to individual equipment which is developing to be unmanned and intelligent. A typical inertial device of individual equipment is taken as the research object to find out its coupling paths based on the analysis of function and structural characteristics, and the effects of HPM coupling to the typical inertial device are simulated by the numerical simulation software CST. The results shows that power and signal cables of MEMS (Micro-Electro-Mechanical System) accelerometer are the main coupling paths of HPM; The power cable has size coupling effect which is strongest when the sum of the cable length and twice the distance to the “ground” is equal to odd times of quarter wavelength, and weakest when the cable length is equal to even times of quarter wavelength; The signal cable has wavelength coupling effect that is positively correlated with cable length which is less than wavelength, and not affected by cable length which is greater than wavelength; The screen in signal cable not only greatly reduces the peak value of coupling voltage, but also effectively reduces the influence of cable length on the coupling effect. The research results provide support for the protection of individual inertial devices, and also provide a reference for the design of HPM weapons.
Study of mechanical properties of cylinder under transient multi-physical field coupling conditions
Authors: Tian N , Liu J G , Gao Y , Wang K , Liu Z C 
Published: June 2023

Abstract
The use of lightweight metal cylinders is of great significance to artillery weapon systems in terms of significant mass reduction, service life extension, power consumption reduction and operational effectiveness. Based on the load conditions provided by the classical internal ballistic theory, a high precision finite element model is solved by the explicit integration algorithm with central difference. The results show that the maximum stress of the thin-walled cylinder increases linearly with the increase of the initial clearance, while the maximum extraction force increases first and then decreases, while the influence of temperature on the extraction force cannot be ignored. Therefore, the design of the initial gap between the thin-walled cylinder and the thick-walled cylinder should be designed to ensure that the maximum stress of the thin-walled cylinder does not exceed the maximum permissible stress and to meet the minimum extraction force, while choosing the correct extraction timing can effectively reduce the extraction force.