bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of Combined Buffer on a High-precision Weapon
Authors: Zhang L , Liu JB , Wang W , Liu Y , Zhang YT 
Published: May 2023

Abstract
Taking the buffer of a high-precision sniper weapon as the research object, according to its technical and tactical performance and buffer requirements, this article focuses on the design of the grooved variable hydraulic damper and anti-forward spring buffer by adopting hydraulic spring combination buffer technology. Using MATLAB mathematical simulation software, the recoil force model was constructed, and the simulation calculation was performed. In the light of calculation results, on the basis of modifying and improving the design parameters of the buffer, the actual shooting test of the buffer has been carried out. The test results show that the buffer can effectively reduce the peak value of recoil resistance while ensuring the shooting accuracy of sniper weapons, thereby reflecting the design of the buffer has achieved the expected effect. The test results verify the principle of the combined buffer, which provides certain reference significance for the design of other large-caliber sniper weapons.
Study on General Technology of Smart Floating Munition
Authors: Li Wang , Fei Tong , Kun Zhang , Xiaolei Li 
Published: May 2023

Abstract
In order to cope with the increasingly severe air defense threat and the problem of low cost-effectiveness ratio of traditional air defense missiles, this paper presents an overall scheme of smart floating munition, a small air defense weapon featuring low cost and high cost-effectiveness ratio, which can be used in batches. The composition and working principle of this weapon system are introduced, and the main technologies involved and solutions are discussed in detail. It can be used as a weapon supplement for Chinese military’s specific airspace blockade in the future.
Study on the Application of Ultrasonic Nondestructive Testing Method for Residual Stress of Autofrettaged Barrel
Authors: He Q , Gao X K , Zhou C J 
Published: May 2023

Abstract
Gun barrel under high bore pressure in the process of gun launching. The tangential stress was produced by autofrettaged technology, which can greatly improve the bearing capacity of barrel. The ultrasonic nondestructive testing method was used to design the residual stress testing device of barrel bore. The tangential residual stress of 125 mm barrel at certain depth from the inner surface was measured. The finite element model considering hydraulic autofrettage and finish machining of inner and outer surface of barrel was established, and the simulation data was compared with test data. It showed that the two methods have fine consistency. This technology can be applied to the residual stress detection of gun barrel in the total life cycle, and accumulate valuable data for improving barrel safety.
Numerical Investigation on the Interaction between Rocket Jet and Supersonic Inflow
Authors: Zhu Liang , Song Jun , Hu Bowen , Xu Ze 
Published: May 2023

Abstract
For the problem of interaction between rocket gas jet and supersonic inflow, this paper has investigated the relevant flow field characteristics by numerical simulation. Firstly, a computational program was developed using high-resolution schemes to solve complex supersonic flow field, which solves the Navier-Stokes equations based on a multi-block structural grid using finite volume method as well as k − ω SST turbulence model. Then, a classical experiment was conducted to validate the developed code. Results show that the rocket jet strongly interacts with the supersonic inflow that results in complex wave structure. The nozzle inlet mass flow rate has an important influence on the interaction. When the mass flow rate is in a low level, flow separation and shock train occur in the divergent region, leading to violent oscillation of flow. With the mass flow rate of nozzle inlet increasing, the rocket gas expands continuously after passing the nozzle outlet and the rocket jet would induce more complex shocks.
Experimental Study on the Damage Performance of the Zr-based Amorphous Alloy Jet against Steel Target
Authors: Cui Ping , Shi Dongmei , Wang Deshi , Zhang Xingze , Li Zhuang , Fu Dikun 
Published: May 2023

Abstract
To study the damage performance of the Zr-based amorphous alloy jet against metal target, the static explosive experiments were conducted with the simulated target of 45# steel in comparison with the copper jet. As shown by the experimental results, the depth of penetration (DOP) of the amorphous alloy jet declines with the stand-off distance after it reaches a level higher than 3.0 charge diameter (CD). Under the same conditions, the DOP of the amorphous alloy jet is less than that of the copper jet, and no plugging is found during penetration of the steel target. Moreover, the perforation area of the amorphous alloy jet increases with the stand- off distance. With a large stand-off, the amorphous alloy jet appears to be dispersed and granular during flight, forming the group of erosion holes on the target plate rather than a huge single perforation. Evident chemical reactions took place during the penetration of the amorphous alloy jet. The combined damage effects of both the penetration and explosion allows the shaped charge to obtain larger perforations, while exerting an adverse impact on the DOP as well.
Effect of Sintering Temperature on Room Temperature Microstructure of TiB Reinforced Titanium Matrix Composite
Authors: Wang Q. , Zhang Z.H. , Su T.J. , Li X.Y. , Zhang S.Z. , He J.Y. , Liu L.J. , Jia X.T. 
Published: May 2023

Abstract
In this paper, the 3.5 vol.%TiB reinforced TC4 (Ti6Al4V) matrix composites were successfully fabricated using a mechanical ball milling and spark plasma sintering. The sintering temperature, sintering pressure and holding time were 700 °C~1100 °C, 40 MPa and 5 min, respectively. The 3.5 vol.% TiB/ TC4 matrix composites. The relative density of 3.5 vol.% TiB/TC4 composites increases with the increase of sintering temperature, and reaches saturation when the sintering temperature is 900 °C. The size of α-Lamellae increases from 1.47 μm to 2.44 μm with the increase of sintering temperature. The aspect ratio of TiB whiskers first increase and then decreases along with the solution time extending.
On Manufacturing Process of Guided Rocket Fairing
Authors: Gao Yuan , Zhao Xiaogang , Sun Jianbang , Nan Guangzhi , Guo Zhiwei , Zhang Ping’an 
Published: May 2023

Abstract
This paper proposes a manufacturing technology plan based on the combination of 3D printing and precision cutting for a certain projectile fairing part with a thin-walled cavity structure. By holistically taking into account the process and design requirements, on the one hand, the process structure required for 3D printing and precision cutting is incorporated into the original design plan to improve the manufacturability of parts; on the other hand, the comprehensive research of the process plan, processing strategy, process equipment can solve the manufacturing difficulties during the product development, which not only ensures the realization of the lightweight product design structure, but also meets the requirements of the precision assembly and product usage.
Research Progress in Improving the Load Bearing Capacity of Composite Rocket Motor Cases
Authors: Meng Xiangwu , Zheng Zhicai , Xiao Yachao , Wang Zhizeng , Chen Yan , Wang Ming , Chang Yan 
Published: May 2023

Abstract
The paper summarizes research progress in ways to improve the load bearing capacity of composite motor cases. It especially sheds light on research progress in the selection of case materials, reinforcement technologies, experimental study and finite element analysis, layer sequence optimization, and hybrid fiber design for boosting the internal and external load bearing capacity of solid rocket motors’ composite cases.
Experimental Simulation of Dynamic Compression Properties of CFRP Cylinders under High Launch Overload
Authors: Wang W , Wang XC , Chen CX , Zhao H , Gao B , Zhang B , Feng JC , Peng G 
Published: May 2023

Abstract
Abstract.To explore the mechanical behavior of carbon fiber reinforced plastics (CFRP) under high launch overload, this study presents a laboratory loading technological method for chamber-pressure curve simulation under high launch overload using a Φ100 mm-diameter split-Hopkinson pressure bar (SHPB) device. On this basis, experiments are carried out to study the dynamic compression properties and failure modes of CFRP cylinders. The results show that applying a load changing in a similar way to the chamber pressure-temperature (P-T) curve to the specimens using a large-diameter SHPB device is an effective technical means to simulate the behavior evolution of CFRP cylinders under high launch overload. Through load testing and simulation, it is found that CFRP cylindrical members have a dynamic compressive strength of 611 MPa, and the maximum force and weight overload of 893 kN and 9023 g respectively, and failure strain between 0.5% and 0.6%. As a structural member, CFRP cylinders exhibit high rigidity and good resistance to high overload.
Research on Multiscale Structure, Component and Properity of Meretrix Lusoria Shell
Authors: Duan TT , Xu XY , Qu FZ , Guo Y , Yan SQ , Wang LL , Ruan GG , Wang JH , Xin PX , Huang YS , Wang L , Wang DG , Li N , Zheng W 
Published: May 2023

Abstract
This research was carried out with focus on the multi-scale structure of meretrix lusoria shell. In mesoscopic, meretrix lusoria shell contains three layers; the thickness of different layers is 0.6mm, 0.8mm and 0.7mm respectively. Compared to mesoscopic structure, the microstructure also has three layers, it refers to cuticle, prismatic layer and nacre. The cuticle is composed of a great number of particles, and its main composition is protein.The prismatic layer is composed of stagger structure. The inner layer presents orthogonal-sheets arrangement. This microstructure might show a special enhanced effect for the whole shell. The different inorganic layers’ crystal is same, which is aragonite. The mechanical properties of Meretrix lusoria shell are excellent, its elastic modulus was the same order of magnitude of high strength glass fiber composites. From this research will provide the theoretical basis for designing and producing bioinspired composite materials.
Influence of Polyurea Packaging Material on Anti-explosion Performance of a Fuze
Authors: Wen Q , Chang TX , Yu SR , Wang GY , Wang YS 
Published: May 2023

Abstract
Polyurea coating has excellent anti-explosion performance. In order to solve the problem of sympathetic detonation of a fuze, a polyuria-coated packaging barrel is designed. ANSYS software is used to simulate the sympathetic detonation test to verify the anti-explosion performance of the packaging barrel. The shock wave and explosion products produced from explosion are obviously hindered. The packaging barrel and the fuze body are damaged but the booster of the fuze is not detonated. The maximum pressure of selected elements in booster is 13.0 GPa, which is less than the initiation pressure of TATB in the booster. The acceptor fuze is not sympathetically detonated. A sympathetic detonation test is carried out and the results are consistent with the simulation.
Study on Interfacial Properties of Carbon Nanotube Modified Epoxy Resin/T1000 Carbon Fiber Composites
Authors: Xiao YC , Ma YD , Zheng ZC , Meng XW , Wang M , Wang Q , Chen Y 
Published: May 2023

Abstract
This study was made on domestic T1000 carbon fiber to investigate its surface condition, precursor, multifilament, fiber/resin contact angle, fiber/resin interfacial shear strength and interlaminar shear strength. Analysis was carried out to examine the surface physical state of domestic T1000 carbon fiber, the micro-scale interfacial properties and mechanical properties of the composites. The results show that domestic T1000 grade carbon fiber has no inherent characteristic defects such as visible bumps, rough edges or grooves on its surface. It can obtain higher tensile strength. The fiber/resin interfacial test shows that carboxylated carbon nanotubes are well dispersed in the epoxy resin matrix by physical method. The mixed resin matrix has good wettability on carbon fibers and the contact angle of the composite interface decreases. The interfacial shear strength of SYT65 carbon fibers/resin increases by 10.6%, and the interlaminar shear strength increases by 15.7%. Toray T1000 carbon fiber/resin interfacial shear strength increases by 6.1%, and interlaminar shear strength increases by 14.1%. Compared with Toray T1000, the resin system used in this study is more compatible with SYT65 carbon fiber, which can give full play to the mechanical properties of SYT65 carbon fiber.
Preparation and Properties of PBO Nanofiber Membranes via Electrospinning and Thermal Conversion
Authors: Xu XY , Duan TT , Guo Y , Wang JH , Yan SQ , Wang LL , Ruan GG , Wang L , Huang YS , Li N , Wang DG , Xin PX , Zheng W 
Published: May 2023

Abstract
In this study, Polybenzoxazole (PBO) nanofiber membranes are prepared by applying a three-step process, including synthesis of the electrospinning precursor with ortho-hydroxyl, electrospinning, and thermal conversion. Electrospinning is conducted at 10 kV with a distance of 10 cm and the solution concentration is 17.8% (w/v). Different flow rates are adopted to prepare polymer nanofiber membranes and test their properties. At the rate of 0.5 μL/min and 1 μL/min, uniform and compact films with nanofibers are obtained. The high-temperature transition from the precursor to PBO is then investigated systematically. Thermal treatment at 420°C is needed for complete cyclodecarboxylation conversion from the precursor to PBO. Diameters of the fibers in the as-prepared PBO nanofiber membrane are within the range of 120-130 nm. The membrane shows high thermal stability with the decomposition temperature of 619.8°C in N2 and 513.6°C in air respectively, presenting a promising application prospect in high-temperature areas.
Study on the Flexible Erosion Reducing Additive Containing Silicon and Boron
Authors: Fan W , Zhu W F , Gao P , He X M , Wang J B 
Published: May 2023

Abstract
In view of the severe erosion and wear of gun barrels, we first briefly introduce the research status of erosion reducing additives in this article. Based on these analyses, polydimethylsiloxane (PDMS)-Na2B4O7 additive and PDMS-H3BO3 additive are designed and prepared. These two additives are very flexible and can be folded or bent in any direction. After that, the erosion reducing performance of paraffin wax (PW)-TiO2 additive, PDMS-Na2B4O7 additive and PDMS-H3BO3 additive are studied through the vented vessel test. The results show that the erosion reducing performance of PDMS-Na2B4O7 additive and PDMS-H3BO3 additive is better than that of PW-TiO2 additive. But PDMS-Na2B4O7 additive cannot be completely burned and there are residues at the loading position of additives. PDMS-H3BO3 additive can provide the best erosion reducing performance and without residues. Therefore, PDMS-H3BO3 additive is selected for further research. The effect of granularity of H3BO3 on the erosion reducing performance is studied and compared with PW-TiO2 additive. The results show that the erosion reducing rate of PDMS-H3BO3-500 mesh additive and PDMS-H3BO3-3000 mesh additive is increased by 6.24% and 6.46%, respectively, compared with PW-TiO2 additive. PDMS-H3BO3-3000 mesh additive can provide better erosion reducing performance. But the granularity of H3BO3 has no obvious effect on the erosion reducing performance.
Optimizing the Anti-stab Performance of Fiber Composites by Using Ceramic Particle Reinforcements
Authors: Wei Rubin , Zhang Hui , Zong Hao , Dong Bin , Wang Xiaowei , Zhai Wen 
Published: May 2023

Abstract
Fiber reinforced composite is widely used in current stab-proof equipment, the high performance and light weight have always been pursued for a long time. The present study optimizes the anti-stab performance of fiber composites by using silica and silicon carbide ceramic particle reinforcements. The anti-stab performance of different composite processes and composite structures were characterized. Silica particle reinforcements were added to the fiber fabric in the form of a shear thickening fluid (STF). Quasi-static puncture tests results revealed that the puncture force of the fiber composite prepared by STF dilution process was significantly higher than that of the sample prepared without dilution. Under the same areal density, the puncture force of the sample with a dilution ratio of 1:2 had been improved by 79.9% higher than that of pure fiber fabrics. Silicon carbide particle reinforcements were added to the fiber fabric in the form of particles/epoxy resin coating. After coated with SiC particles, the aramid fiber fabric not only greatly improves the puncture force, but also significantly increases the wear of the tool. The dynamic puncture test results further showed that the SiC coated / STF aramid plain weave fabrics exhibited excellent stab-resistant performance.
Effects of Self-heating Process on the Mechanical Properties and Energy Consumption in Molding of Carbon Fiber/Epoxy Composites
Authors: Wang ZY , Chen G , Wang QF , Chong L , Yu QQ , Wu ZQ , Wang Z 
Published: May 2023

Abstract
In order to increase the molding efficiency of carbon fiber composites and reduce their energy consumption in molding and manufacturing costs, this study explores the self-heating molding process of carbon fiber composites and investigates the uniformity of temperature distribution of carbon fiber/epoxy (CF/EP) composites. Besides, the mechanical properties, molding efficiency and energy consumption of CF/EP composite laminates are studied, and the comparison with the conventional hot compression molding process is conducted. The results show that the fixing mode of the electrodes greatly affects the heating rate and temperature uniformity-specifically, the use of bolted pressure plates leads to a faster heating rate and a more uniform temperature distribution than the use of conductive adhesive tape. During the self-heating process, the temperature difference inside the prepreg stack of CF/EP composite laminates was found less than 5°C. Compared with the CF/EP composite laminates molded by hot compression, those molded by self-heating exhibited an increase in tensile strength by 14.9%, compressive strength by 14.2%, interlaminar shear strength by 2.5%, tensile modulus by 11.6%, and flexural modulus by 11.1%, except for bending strength that showed no significant improvement. The self-heating molding process showed a heating rate of 5-10 times higher than the hot compression molding process, consumed only about 6.8% of the energy that the latter required, and increased the molding efficiency by 32%.
New Trends in Ballistic UHMWPE UD Fabric
Authors: Wang JH , Guo Y , Su YX , Xu XY , Duan TT , Wang LL , Yan SQ , Ruan GG , Xin PX , Wang L , Li N , Huang YS , Zheng W 
Published: May 2023

Abstract
Ultra-high molecular weight polyethylene unidirectional fabric (hereinafter referred to as UHMWPE UD fabric) composite material is a ballistic composite material with excellent performance. Aiming to improve the ballistic property of UD fabric composite, this paper introduces the new trends both in polyethylene fiber broadening technology and UHMWPE UD fabric resin system; in view of the low heat resistance and poor resistance of UHMWPE UD fabric, the application and development of functionalized UHMWPE UD fabric composite are discussed. Finally, a new type of molecular ballistic composite material is proposed, which has a micro-structure obviously different from that of the conventional UHMWPE UD fabric composite.
Development of Methods for Determining Molecular Weights of Epoxy Resin
Authors: Hou QQ , Liu X , Gong W , Xu F , Zhang WS , Dong YZ , Xun QN , Ji KJ 
Published: May 2023

Abstract
Molecular weight, as one of the characteristic indexes of the intrinsic structure of epoxy resin, has a decisive impact on the curing process of epoxy resin, the structure of cured products and even the properties of composites. It is an important indicator for the quality evaluation of epoxy resin. This paper introduces various instrumental analysis techniques for molecular weight testing, including gel permeation chromatography, nuclear magnetic resonance spectroscopy, vapor pressure osmometry and mass spectrometry, and also compares and reviews the principles, characteristics, applications, and problems of each method, and finally looks into the research prospects.
Effect of Different Si Target Currents on Performance of Magnetron Sputtering Wear Resistant Coatings
Authors: Liu D , Shen YL , Wang EL , Meng C , Liu J , Shen QM 
Published: May 2023

Abstract
In order to ameliorate the properties of the coating material on the surface of the key moving parts of artillery, the influence of different Si target currents on microstructure and mechanical performances of magnetron sputtering TiAlMoSiN coating was studied. The phase structure of the coating, microstructure, coating adhesion, friction and wear properties were characterized, respectively. The deposited TiAlMoSiN coatings were mainly composed of TiN phase, Mo2N phase, amorphous Si3N4 phase and amorphous AlN phase. A typical columnar nano-multilayer structure was formed on the TiAlMoSiN coating after magnetron sputtering process. When the Si target current reached 1.0A, the coating hardness was supreme, valued 32.6 GPa. Along with the addition of the Si target current, the hardness and the bonding strength between the coatings and 45 steel substrates declined. As the Si target current was 1.5 A, TiAlMoSiN coating has the lowest friction coefficient and wear rate. Moreover, it was found out the coating with Si target current at 1.0A had shown the optimal surface properties.
Numerical Simulations of Reactive Material Double-Layered Liner Shaped Charge Penetrating Steel Target
Authors: He Suo , Chen Ting-hao , Sun Tao , Guo Huan-guo 
Published: May 2023

Abstract
The jet formation and penetration behaviors of shaped charge with a reactive material double-layered liner (RM-DLL) are presented in this paper based on the AUTODYN-2D code. Numerical results show that the wall thickness ratio of the RM-liner to the metal liner has a significant influence on the formation and penetration characteristics of composite jet. As the wall thickness ratio increases, the tip velocity of composite jet, the pressure on the RM-liner, and the temperature of RM-elements decrease. The effect of the wall thickness ratio on the penetration performance of RM-DLL shaped charges against steel targets significantly depends on the RM-initiation delay time (τ). The penetration depth (PD) of the composite jet with titanium liner into the steel target is limited. In the case of the RM-tungsten liner, the RM-mass following into the penetration crater is very small. In the case of the RM-copper liner, the penetration capability of composite jet is well matched with the mass of follow-thru RMs. Compared with the PD, the standoff has a more significant impact on the RM-mass entering the penetration hole.
Progress in the Preparation Methods of Poly (P-Phenylene Benzodioxazole)
Authors: Liu W , Guo C , Zhang DB , Chen XD , Peng XY 
Published: May 2023

Abstract
Poly (p-phenylene benzodioxazole) is an aromatic liquid crystalline polymer. Because of its unique rigid structure, high strength, high modulus, high temperature resistance and excellent chemical stability, it has broad application prospects in aerospace, ballistic resistance, fire protection and reinforcement materials. This paper summarizes several routes and methods for the preparation of PBO polymers, such as the terephthalic acid method, the AB monomer polymerization method, the TD complex salt method, and explains the development direction of the preparation of PBO polymers.