bluuebunny/crossref_metadata_2025_split huggingface dataset:
Test analysis anti-shock ability of polyurea coating
Authors: Jia ZJ , Wang S , Cui HL , Hu XB 
Published: June 2023

Abstract
In order to study the impact resistance of the polyurea coating, a 12.7mm ballistic gun was used to launch an impact load to load the target plate, then the velocity of the fragments before and after penetrating the target plate was measured, and the ballistic limit and limit specific absorption energy of the target plate were calculated. At the same time, combining with the coating failure morphology, analyses anti-penetration effect of polyurea protective coating under unit areal density. The research shows that the impact resistance of the composite structure coated with high hardness polyurea coating on the front surface is the best, it has nothing to do with substrate; the impact resistance of the composite structure coated with soft polyurea coating on the back surface is better than that of high hardness polyurea coating, among them, the coating on the back surface will inhibit the impact resistance of composite structures such as fibers that dissipate energy through tensile failure.
Research on test and evaluation method of unmanned ground vehicle information display performance based on fuzzy comprehensive evaluation method
Authors: Zhang Yue , Jiang Haibo , Yu Hai , Hou Xueyi , Gu Chen , Jin Cong 
Published: June 2023

Abstract
This paper conducts research on the test and evaluation method of unmanned ground vehicle information display performance. We build the framework of the performance evaluation system through the analysis of the characteristics of the control terminal. We establish the factor set, evaluation set, weight set and evaluation matrix of the unmanned ground vehicle information display performance and conducts multi-level fuzzy comprehensive evaluation, which provides an effective method for the performance test and evaluation of the unmanned ground vehicle information display.
A Chaotic Pulse Position Modulation Method for Ultra-Wideband Fuze
Authors: Wu Kaiwei , Shi Xiaoshan , Liu Chunhua , Yang Bing , Wang Zhiqi 
Published: June 2023

Abstract
This paper presents a composite chaotic binary sequence that can be used for ultra-wideband(UWB) fuze pulse position modulation, which has good randomness under byte-constrained conditions. The feasibility of this composite sequence for UWB fuze pulse position modulation is verified by hardware implementation. The application of this composite chaotic sequence with good randomness for UWB fuze pulse position modulation will increase the difficulty of recognition by fuze jammer and enhance the radio fuze resistance to active interference.
Rapid positioning test method for cylindrical structure penetration based on machine learning
Authors: Xin Zhang , Bingwen Qian , Bolin Gong , Yutao Hu , Yusong Zhang , Xie Jiang 
Published: June 2023

Abstract
Focusing on the requirements of rapid damage location test for multi-layer steel plates penetration of cylindrical structure in the complex and harsh environment, this paper studies the propagation characteristics of high-speed impact stress waves in steel plates. Also, the measurement effects of impact stress in the near zone of penetration hole are compared with different sensors, so as to select appropriate PZT sensors to measure the velocity of impact stress wave in the actual steel plates. Then the array layout scheme is designed, and the corresponding damage location algorithm is determined. Finally, the deep learning algorithm is used to improve the accuracy and efficiency of damage location.
A method for optimizing the precision of weighted fourier integral transformation algorithm
Authors: Jianhang Sun , Yang Liu , Chunran Sun , Wuwen Lai , Shi Pan , Jun Zhou , Ziheng Cheng , Weidong Hu 
Published: June 2023

Abstract
RCS refers to the radar cross section, which is an important index to reflect the electromagnetic scattering characteristics of the object. RCS measurement is the only method to obtain the real RCS of objects. Since test range often cannot reach the far-field condition for large size object, the near-field-to-far-field transformation(NFFFT) technology is significant in the RCS measurement. The core of NFFFT are different algorithms. Among them, the weighted fourier integral transformation is a universal algorithm, but the data in the aspect angle is segmented in the process, which leads to the discontinuity of the transformation results at the splicing point. This paper introduces a method to optimize the precision of weighted fourier integral transformation algorithm, which can fully suppress the discontinuity of transform results and improve the precision of weighted fourier integral transformation algorithm under the paraxial constraint conditions. Finally, the result of simulation demonstrates the precision and efficiency of this method.
Effect of heat input on microstructure and corrosion resistance of high-nitrogen austenitic stainless steel welded joints
Authors: Li Jianguo , Jia Dongsheng , Zhang Peng , Ma Tao , Lu Zhiyuan , Guo Yunpeng , Wang Lei , Li Zhijie , Li Guoliang 
Published: June 2023

Abstract
In this study, the microstructure and corrosion resistance of high-nitrogen austenitic stainless steel welded joints with different heat inputs were investigated. A high heat input leads to a large width and depth of the fusion pool and a low fraction of δ-ferrite in the weld sea. However, a high fraction of Cr-rich precipitates is formed under a high heat input and low heat promotes the formation of δ-ferrite. Therefore, following corrosion tests, the weld seam suffers severe intergranular corrosion under high heat input and low heat input, and the corrosion resistance of the weld is the highest at a heat input of 6.8 kJ/cm. A high heat input results in a high fraction of Cr-rich precipitates and a random boundary in the heat affected zone (HAZ), which decreases corrosion resistance. Furthermore, corrosion test results indicate that the Cr-depleted area and random boundary are initially corroded, and high heat input decreases corrosion resistance of the HAZ.
Research on The Application of Bracket Loading in Ammunition Distribution
Authors: Li Xin , Wang Li-guo 
Published: June 2023

Abstract
In order to achieve fast and efficient ammunition unitized security, based on the bracket, combined with the supporting self-discharging vehicles, the whole loading and unloading function of ammunition in field conditions is realized, which greatly improves the efficiency of ammunition support. Taking the U.S. Army’s ammunition bracket loading guarantee method as an example, the application of bracket loading in ammunition distribution is introduced. It is proposed that by continuously pursuing the improvement of the assembly tools, the overall loading and unloading exchange efficiency of the bracket loading can be further improved, which in turn speeds up the circulation of ammunition assembly.
A new type of explosive driven fragmentation test device
Authors: Hao Chen 
Published: June 2023

Abstract
An important performance index of explosive is the driving ability of fragment. A new fragment driving test device is proposed in this paper. Taking spherical tungsten fragment as the driving object, the influence of thin shell and thick shell structure on the driving ability of the test device was analyzed combined with TNT and WY-1 explosives. The test results show that the designed fragment driving test device can effectively distinguish the driving ability of different explosives to fragments. And the simulation results are in good agreement with the experimental results. The deviation of fragment driving velocity obtained by the test device is 5 % ~ 8 % compared with that calculated by Gurney model.
RCS Computation and Analysis of a Diamond-shaped Thermal Jacket for Gun Barrels
Authors: Zhang Jie , Gerileqimuge  , Xie Run , Song Yanming , Sun Quanzhao 
Published: June 2023

Abstract
A research on RCS simulations and analysis of a diamond-shaped thermal jacket was carried out, to make thermal jackets on tanks less detectable to known radar observation methods. Based on the principles of radar stealth technology, a diamond-shaped thermal jacket was modeled. The RCS simulation models were established by employing the physical optics method (PO), the monostatic RCS characteristics of the diamond-shaped thermal jacket at high frequency region was investigated, and the major components affecting the radar scattering characteristics were evaluated. The original end part played a major role in the radar scattering characteristics of the diamond-shaped thermal jacket. The RCS simulation of thermal jackets in various shapes, including the cylinder-shaped, the original diamond-shaped, and the diamond-shaped without the original end part are carried out, and a comparative evaluation of the schemes is provided. The results show that trans-shaping the cylinder-shaped model to the diamond-shaped model is a method to effectively reduce the average RCS of the thermal jackets in the frontal and lateral directions, improve the overall stealth performance of tank guns. The work is beneficial for design and evaluation concerning about the shape stealth technology of thermal jackets for gun barrels.
Effect of ramming initial state on band engraving in smooth-bore guns
Authors: Guo C Y , Yang G L , Ge J L , Sun Q Z 
Published: June 2023

Abstract
Most modern tank guns are high bore pressure smooth-bore guns that often use High Explosive Antiarmor (HEAA) projectile in combat. This paper focuses on the coupled smoothbore gun- HEAA projectile system, and analyses the projectile ramming-band engraving process when a tank fires HEAA projectile. First, a finite element mesh model of the coupling dynamics of a large-calibre tank gun smoothbore barrel and HEAA projectile was established, and the band was discretized by using the Smoothed Particle Hydrodynamics (SPH) method based on the Lagrange mesh. Then, the propellant gas pressure acting on the bore and the base of the projectile was defined by ABAQUS user’s subroutine. Finally, the ramming-engraving process simulations were carried out for the ramming residual stress and strain, ramming tilt and different ramming misalignment distances working conditions respectively. According to the simulation results, the effect of different ramming initial states on the band engraving process was obtained. The conclusion provides some reference for the simulation of the band engraving process.
A multi-relaxation-time discrete Boltzmann model of compressible nonequilibrium reactive flows
Authors: Lin Chuandong 
Published: June 2023

Abstract
A multi-relaxation-time discrete Boltzmann model (DBM) is proposed for compressible nonequilibrium reactive flows. The uniform discrete Boltzmann equations are the governing equations of the discrete distribution functions that describe the reactive system. On the right-hand side of the discrete Boltzmann equations, the reaction terms calculated by the inverse matrix method are used to couple chemical reactions and multi-physical fields naturally. Numerical tests show that the DBM is suitable for premixed, non-premixed and partially premixed reactive systems, and is also capable of high-speed compressible reactive flows.
Collapse deformation simulation of metal liner under coupling of multi-physics field
Authors: Wang Y W , Liang H Y , Wang S Y 
Published: June 2023

Abstract
In order to study the collapse deformation mechanism of metal liner under coupling of multi-physics field, the input current was obtained through circuit design and simulation by Multisim. The results show that the peak input current is determined by the capacitor voltage. The coupling simulation of electromagnetic-thermal-mechanical field was carried out by using LS-DYNA software. The influence mechanism of liner on the collapse deformation of the metal liner is analysed. The collapse deformation of liner with cylindrical tip is different from that of traditional liner. The tip of the cylinder is beneficial to utilizing the high pressure in the centre of the cylinder. But the micro-element at the top of the cone collapse to the axis with decreasing velocity along the outer contour of the tip. For the conical metal liner with cylindrical end, the current peak needs to reach more than 2 MA to make the liner obtain sufficient collapse velocity. The collapse velocity of conical metal liner element increases with the decrease of wall thickness, while the collapse velocity of bottom liner element decreases with the increase of cone diameter and cone height.
Calculation and analysis of fluid-solid coupling of rocket sled supersonic water bucket braking process
Authors: Chen Cheng. , Lv ShuiYan. , Zhang Jie. 
Published: June 2023

Abstract
In order to solve the problem of structural damage during the braking process of a rocket sled supersonic water bucket, which affects the braking effect, it is proposed to use the FEM fluid-solid coupling calculation technology to analyze the process of the water bucket entering the water brake. The fluid-solid coupling calculation results show that the limit braking state After the water bucket enters the water brake for 0.06ms, the stress at the entrance position exceeds the yield limit of the material, and the structure is severely deformed and damaged; under normal braking conditions, the water bucket enters the water brake for 0.4ms, the plate at the entrance of the bucket bends, and the structure is seriously deformed at 2ms, The structure is destroyed at 3ms. Using the penalty function fluid-structure coupling method, the numerical analysis of the model water bucket was carried out under two working conditions. Due to the unreasonable design of the bucket, the bucket entrance deformed and destroyed during braking. It is recommended to increase the structural strength of the water inlet side plate.
Influence of Fiber Angle on the Steady State Periodic Response of Annular Sectorial Plates
Authors: Saood Ahmad , Khan Sanan H , Mourad Abdel Hamid I 
Published: June 2023

Abstract
Structural elements in the form of annular sectorial plates are widely used in aeronautical, biomedical, and marine engineering. When these components are exposed to dynamic load, large-amplitude vibrations occur. The vibration response analysis based on the linear strain-displacement relation typically yields a conservative estimate and can be used as a first approximation to the actual solution for thin structural elements. As a result, geometric nonlinearity must be incorporated for the efficient and fail-proof design of such elements. This paper shows non-linear and linear steady-state forced vibration responses of the annular sectorial plates. The governing equations of motion have been solved in the time domain by using a modified shooting method and an arc-length/pseudo-arc length continuation technique at the bifurcation point to obtain the complete response curve comprised of stable and unstable branches. This work investigates the effect of fibre angle on the non-linear steady-state forced vibration response of annular sectorial plates. The strain/stress fluctuation throughout the thickness of the laminated annular sectorial plate is determined to explain why hardening nonlinearity has increased. The cyclic fluctuation of the non-linear steady-state normal stress during a time period at the centre of the top and bottom surface is also provided in relation to the forcing frequency ratio of peak amplitude in the non-linear response. Due to the change in restoring forces, the frequency spectra reveal much increased harmonic involvement along with the fundamental harmonic for all fibre angles.
Demagnetization properties study on NdFeB permanent magnets under impact load
Authors: Liu Tiantian , Yang Guolai , Li Lei 
Published: June 2023

Abstract
Sintered NdFeB materials are more and more widely used in the military field because of their excellent magnetic field performance and cost performance. The demagnetization of materials caused by the impact was discussed in this paper to provide a theoretical basis for the application of NdFeB. Firstly, the experimental platform for the demagnetization of material under impact was built, and the corresponding load of impact was calibrated by using the thin-film piezoelectric sensor. In the experiment, the changes in the magnetic field were converted into an electrical signal that was easy to observe. The curves for the changes of the induced electromotive force and magnetic flux were obtained under different velocities of impact. Then, a new impact demagnetization model was proposed combined with the experimental results and the demagnetization process of sintered NdFeB materials under an external magnetic field. The model was based on the stress knee-point hypothesis and irreversible deterioration hypothesis. Finally, the co-simulation model was established in this paper, and the identified parameters were substituted into the model for numerical calculation. The validity of the model and the accuracy of parameter selection were verified by comparing the calculation results with the experimental results.
A new high energy but low explosion temperature gun propellant component: nitrogen-rich tetrazole derivative grafted nitrocellulose
Authors: Yang C H , Di Z Y , Li X , Wang K W , Hu X L , Ouyang D H 
Published: June 2023

Abstract
In order to apply the high nitrogen-content tetrazole derivatives (TZD), a class of energy materials with great potential, into gun propellant, we propose a novel idea that grafting the acidized TZD onto cellulose and then nitrifying the grafted cellulose to obtain nitrocellulose grafted by TZD (TZDNC). Theoretical predictions suggest that Replacing nitrocellulose (NC) with TZDNC, due to having higher nitrogen-content of TZDNC than traditional NC, can evidently reduce the ablation to gun tube, smoke and flame around muzzle of gun tube. The replacement not only solves the incompatibility of TZD with the other components such as NG, RDX and HMX, but maintains the nearly gun powder power of gun propellant before replacing.
Energetic Characteristics Analysis of Propellants Containing ammonium salts of bis(3-dinitro-1H-1,2,4-triazolyl) borate
Authors: Wang Guo-dong , Ke Yong , Han Rui-lian , Zhang Ling-hao 
Published: June 2023

Abstract
The energy characteristics of HTPB propellant and modified double-base propellants containing bis(3-nitro-1,2,4-triazolyl) ammonium borate are simulated and calculated by NASA’s computer program CEA in the standard state (Pc: P0 = 70:1). The results show that the theoretical specific impulse of the modified propellant is 2539.9 N·s/kg. When the mass fraction of ammonium borate is 80%, the maximum Isp is 2488 N·s/kg, which is 6.5% higher than that of the basic formula, so adding ammonium borate to the propellant is beneficial to improving the overall performance of the propellant. In addition, it is environmentally friendly since it does not contain halogen elements.
Research on the Performance of Deterred-coating DIANP Gun Propellant
Authors: Liu Bo , Ma Fang-sheng , Bian Xiao-yu , Tian De-qing , Wang Qiong-lin , Lv Hao 
Published: June 2023

Abstract
Deterred-coating DIANP gun propellant was prepared by the two-step process called “polymer composite materials deterring and energetic composite materials coating”. The performance of energy and static combustion of deterred-coating DIANP gun propellant was investigated by explosive heat and closed-bomb test. The results show that compared with DIANP gun propellant, the energy of deterred-coating DIANP gun propellant decreased by only about 3.2%, but it had better combustion progressivity and low temperature sensitivity effect. The combustion progressivity of deterred-coating DIANP gun propellant was improved by increasing the content of deterring and coating materials.
Influence of Binder on Surface Properties and Coating Effect of TKX-50 Explosive
Authors: Yao L N , Wang C L , Han Z X , Wang H Q , Cao F J , Sheng S X 
Published: June 2023

Abstract
In order to study the surface interaction between binder and TKX-50, fluororubber F2603, ETPE, and BR were adhered to the surface of TKX-50 by the direct solvent volatilization method. The spreading coefficient and adhesion work between the three adhesives and TKX-50 were analyzed by a surficial performance test. The coating effect and safety of TKX-50 coated by three binders were discussed by XPS, SEM, and mechanical sensitivity. The results showed that F2603, ETPE, and BR were adhered to the surface of TKX-50 to form efficient spreading and bonding. The coating effect of F2603 on the TKX-50 was better than that of ETPE and BR, which improved the mechanical sensitivity of TKX-50. The results show that some binders could have positive effects on improving the safety of TKX-50.
Combustion-supporting effect of boron powder on aluminum powder
Authors: Zhang Wei-peng , Guo Hui-li , Huang Ya-feng 
Published: June 2023

Abstract
Aluminum powder is a very important component in both explosives and propellants. Due to the formation of a dense oxide layer Al2O3 at the surface of aluminum, it is very difficult for aluminium powder to react completely, which is the biggest problem at present. For improving the completeness of the reaction of aluminum powder, six kinds of combustion accelerants, ferrocene, ammonium perchlorate, Fe2O3, fluororubber F246, perfluorosurfactant HX-12 and boron powder were selected to study their combustion-supporting effect on aluminum powder by differential scanning calorimetry (DSC) method. The research results show that the six reagents have certain combustion-supporting effects, but the combustion-supporting effect of boron powder is particularly significant. Two extra exothermic peaks appeared as adding small amount of boron powder to aluminum powder. When the content of boron powder is 10 wt % of aluminum powder, the total exothermic heat is more than twice than that of pure aluminum powder FLQT-4. In short, boron powder is a very promising combustion accelerant.
Cook-off Characteristics of Solid Rocket Motor with AP/HTPE Propellant Charge
Authors: He Kai-le , Xue Xiao-chun 
Published: June 2023

Abstract
Conducting thermal safety research on solid rocket motors is a method to effectively improve the battlefield survivability of rockets and missile weapons. Based on the AP-based cock-off reaction mechanism, a 2-D unsteady axial symmetrical model of solid rocket motor is developed. The software Fluent is used to calculate the numerical value of the rocket motor under thermal stimulation conditions of different heating rates. The results indicate that the heating rate of cook-off is negatively correlated with the ignition delay time of the motor, and there is no significant connection between ignition temperature and heating rate. But it is obvious that heating rate has a big impact on ignition position. In the slow cook-off numerical calculation, the initial ignition position appears near the propellant head. And the higher the heating rate, the closer the ignition position is to the propellant head. At rapid heating rate of 1.45K/s, the ignition position appears at the edge of the left end face of the propellant. When rapid heating rate is 1.75K/s or 1.95K/s, ignition position appears at the edge of the right end face of the propellant. At this time, the ignition position will change abruptly.