bluuebunny/crossref_metadata_2025_split huggingface dataset:
Tension Performance Prediction and Experiment of Optical Smart Composites Using Micromechanical Failure Theory
Authors: Zhang Yunqian , Luo Lilong , Zhang Guofan , Chang Liang , Nie Xiaohua 
Published: December 2024

Abstract
Embedding fiber optic sensors in composites can long-term instantly monitor the deformation and damage within the composite structure, which realizes structural health monitoring and life prediction. However, fiber embedding generally brings damage in terms of the composite material integrity and continuity, resulting the extreme stress concentration in the interface of the optical fiber and composite. Therefore, the mechanical properties of the composite material are potentially influenced unfavorably. To investigate the influence of microstructures such as optical fibers on the macroscopic tensile mechanical properties of composites, this paper develops a progressive damage analysis model inspired by the micromechanical failure theory. The established model can predict the stiffness and strength properties of fiber smart composites. The model is further verified by comparing the obtained tensile failure mechanism with the experimental results. The results show that the maximum relative error of the destructive load is only 3%, which demonstrates the accuracy and validity of the model. The work of this paper can provide guides for the optimization and strength prediction of smart composite structures with embedded optical fibers.
Precipitation Behavior of Secondary γ′ Phase of Nickel-based Superalloy during Gradient Cooling Process
Authors: Fu Pei , Liu Wei , Zhou Ping , Xie Ziwei 
Published: December 2024

Abstract
Nickel-based superalloy is an indispensable strategic material in aerospace, national defense, and other fields. Heat treatment is an important process for preparing nickel-based superalloys because of its great influence on the microstructure and mechanical properties. In this paper, the end-quench test and numerical simulation were applied to study the relationship between the cooling rate and precipitation behavior of the secondary γ′ phase of the nickel-based superalloy efficiently. The in situ end-quench test system was established to reduce temperature error caused by heat loss during specimen movement, providing an accurate initial temperature distribution for quenching. Besides, the process including the induction heating and the gradient cooling was simulated to obtain the cooling rate at any position of the specimen. The results show that in the cooling rate range of 51~1574 K /min, when the cooling rate decreases, the morphology of the secondary γ′ phase changes from spherical to nearly square or irregular polygon, and the size increases from 27.8nm to 161.4nm. Furthermore, a double logarithmic correlation was found between the average cooling rate and the size of the secondary γ′ phase, which had great meaning in designing and optimizing the heat treatment process of the nickel-based superalloy.
Tracking and control of UAV-borne gun under complex operating conditions: A constraint-following approach
Authors: Ma Yuze , Guo Xiaoyuan , Wu Jing , Ma Jie , Liu Feifei , Si Zhihui , Li Xiaojiao 
Published: December 2024

Abstract
A control problem for UAV-borne gun stability based on constraint-following approach was addressed in this paper. The objective was to design a control to drive the gun stability control system to follow a stability constraint approximately: with the consideration of (possibly) time-varying uncertainty, the gun adjusts from the off-target position to the target direction and tracks steadily as the target moves. In this paper, multibody dynamics and control system co-simulation method was used to verify the stability of the controller. Compared with other linear controllers, the constraint-following controller adjusts the gun to the target position faster and follows the enemy vehicle target more stably.
Research on the compressive mechanical behavior and constitutive model modification of novel refractory high-entropy alloy (Ti2Zr)1.5NbVAl0.25
Authors: Zheng H L , Wang Z X , Li Z K , Xu L Z , Wang J B , Du Z H 
Published: December 2024

Abstract
In recent years, high-entropy alloys have been widely applied across various fields. To explore the mechanical properties of high-entropy alloys and their characteristics under extreme environments, ingots of a quinary high-entropy alloy (Ti2Zr)1.5NbVAl0.25 were prepared. The material’s compression mechanical properties were studied under quasi-static conditions at room temperature with strain rates ranging from 0.001s−1 to 0.1s−1, dynamic compression at strain rates ranging from 1300s−1 to 3100s−1, and compression at a strain rate of 1900s−1 and temperatures from -80°C to 400°C. Impact specimens subjected to strain rates of 1300s−1 and 3100s−1 at room temperature were recovered for metallographic analysis. The results indicate that (Ti2Zr)1.5NbVAl0.25 exhibits significant strain-hardening behavior and strain rate sensitivity. Under medium to high strain rates, the alloy undergoes a phase transformation from a single-phase BCC structure to a mixture of BCC and B2 phases upon impact, with 2500s−1 being the threshold strain rate for phase transformation. The original parameters of the Johnson-Cook constitutive model were fitted based on experimental data, and modifications were made to the strain rate hardening and temperature terms in the original model. The modified Johnson-Cook constitutive model demonstrates improved prediction of the mechanical properties of (Ti2Zr)1.5NbVAl0.25 high-entropy alloy at both room temperature and under extreme environments.
Anti-migration of DOS by Using HTPB/GO liner and GO film
Authors: Lu Zhehong , Li Jingyi , Wang Yanlong , Zhu Ziqiang , Jiang Wei , Huang Rong , Hu Yubing 
Published: December 2024

Abstract
The enhancement of anti-migration performance in insulation materials is critical for the stability and reliability of solid rocket motors (SRMs). This study explores two innovative methods to improve the barrier properties of Ethylene Propylene Diene Monomer (EPDM) insulation layers. Firstly, a composite liner combining Hydroxyl-Terminated Polybutadiene (HTPB) and Graphene Oxide (GO) was synthesized through a solution blending method. Additionally, a GO film was fabricated and integrated with the HTPB liner and EPDM to create a multilayer sandwich structure. The incorporation of these materials was found to significantly enhance the anti-migration performance, with the composite samples showing a 16.89% improvement over standard samples. The layered structure of GO effectively impedes the migration of dioctyl sebacate (DOS), enhancing the anti-plasticizer migration properties of the EPDM. While the multilayer sandwich samples also demonstrated improved performance, issues with adhesion between the GO film and EPDM lead to reduce its effectiveness. Future research will focus on improving the adhesion between the GO film and EPDM to further enhance anti-migration performance. This study provides valuable insights for developing high-performance EPDM insulation materials with enhanced anti-migration properties for aerospace applications.
STM32-based firearm system storage environment monitoring and control system
Authors: Ji Mengke , Yin Jianping , Wang Zhijun , Yi Jianya , Li Xudong 
Published: December 2024

Abstract
In order to realize real-time monitoring of the storage environment of the firearm system, adjust the storage environment of the firearm system, and turn on the safeguard measures in a timely manner, so that the missile weapon system is always in a suitable storage environment and its storage life is maximized. In this paper, a weapon environmental monitoring and control system based on STM32 microcontroller is designed. The system takes the STM32F103ZET6 microprocessor as the core, uses sensors such as temperature and humidity, light, smoke and gas concentration to collect environmental information, and then transmits the data to the OLED screen for display, and at the same time completes the communication between the device and the cloud platform through the Wi-Fi module. The system will automatically alarm through the buzzer and screen prompts, and the App mobile phone will also send out corresponding prompts. The test results show that the system can effectively realize real-time remote monitoring and control of the storage environment, and the system has low power consumption, simple operation and good compatibility, and has certain application value.
Orthogonal optimization analysis on the jet penetration behaviour of biconical reactive liner
Authors: Liu Yize , Su Chenghai , Wang Haifu 
Published: December 2024

Abstract
In order to improve the penetration depth and hole diameter of concrete target penetrated by reactive jet, a biconical reactive shaped charge was designed in this paper. Based on ANSYS-LSDYNA numerical simulation platform, orthogonal optimization design method was used to optimize the structure of biconical reactive shaped charge. The influences of the upper cone angle, lower cone angle, upper liner ratio of liner, liner thickness and charge length-diameter ratio on jet formation and penetration were obtained. On this basis, the three performance indicators of penetration depth, cross-sectional area of hole and damage area were analysed and discussed, and a set of optimal structural parameters were obtained. Numerical simulation results showed that the optimal biconical reactive shaped charge could cause penetration depth of 1075.88mm (5.97CD), the cross-sectional area of 0.070172m2, and damage area of 0.084427m2 to the semi-infinite thick concrete target at 3CD standoff. Compared with control variable method, the improvements of three performance indicators can reach 29.83%, 32.26% and 127.00% respectively.
Precise calculation for underwater internal ballistics based on bi-directional coupling
Authors: Sun Zhiqun , Li Qiang , Qu Pu , Lu Lin 
Published: December 2024

Abstract
An accurate calculation method for underwater internal ballistics considering motion resistance is proposed based on bi-directional coupling. The resistance of the projectile against water is often neglected in underwater classical internal ballistic modelling, leading to less precise calculations. In this paper, the mutual influence of the projectile motion and the water current is considered comprehensively by establishing a bi-directional coupling model of the fluid and the projectile. The launching process of the underwater projectile is simulated in detail using a combination of computational fluid dynamics (CFD) and classical internal ballistics (CIB). The numerical simulation results show that the bi-directional coupling model has high accuracy in predicting the trajectory, initial velocity and pressure distribution. Compared with the traditional bi-directional coupling model, the bi-directional coupling model can reflect the actual situation more accurately, which significantly improves the reliability and accuracy of underwater ballistics research. The research results of this paper provide new theoretical support for underwater ballistic design and are of great significance for improving the performance of underwater weapon systems.
Life test and inner bore damage analysis of high chamber pressure gun barrel
Authors: Geng Xuehao , Li Haoyang , Liu Feifei , Gao Tan , Yang Ruiqiang , Zhao Zhiyi , Yu Bing 
Published: December 2024

Abstract
This paper is devoted to research the inner bore damage laws of high chamber pressure tank gun barrel, A larger caliber tank gun barrel is chosen as study object and a full life test is conducted for this barrel, three life-related parameters(muzzle velocity, chamber pressure and inner bore size) are measured during the test. The life of this gun barrel is judged to end according to the high chamber pressure gun barrel life criteria after 658 fired rounds. Life-related parameters variation analysis and initial erosion condition inspection of this test gun barrel are conducted after the test, and several high chamber pressure gun barrel damage laws are obtained. The damage laws have guiding significance for damage mechanism research and life enhancement technology study of high chamber pressure gun barrel.
Research on the penetration-deflagration coupled characteristics of encased reactive fragments
Authors: Zhang Jiahao , Zhang Tianyang , Liu Chengzhe 
Published: December 2024

Abstract
To investigate the penetration-deflagration coupled characteristics of encased reactive fragments, a numerical simulation model of the encased reactive fragments penetration plate was developed based on Ansys/Lsdyna. Firstly, the mechanical response of the encased reactive fragments penetration plate was obtained using the Johnson-Cook material model, which yielded the internal pressure distribution of the reactive material. Subsequently, the JWL model was used to simulate the penetration-deflagration process, where the JWL parameters of the reactive material were determined based on the condensed reaction material detonation theory. The results indicate that a larger plate thickness value leads to a decrease in the overall internal pressure of the reactive material, thereby reducing the reaction rate of the reactive material. The plate thickness has a marginal impact on the reaction of the encased reactive fragments, but it significantly influenced the deformation and break of the shell, this paper gives the optimal shell and plate thickness under the impact conditions. coefficient and stability.
Application of Target Enhancement Method Based on Image Super-resolution in the Field of Explosion and Shock
Authors: Zhang X , Wang C L , Qian B W , Ke M , Wu Z H , Meng Z , Zhang B T 
Published: December 2024

Abstract
In the explosion and impact scenes, there are a large number of images with poor imaging quality due to the insufficient resolution of high-speed camera hardware, and in order to accurately analyze the impact of the damage element and the power of the projectile, it is necessary to greatly improve the image quality from the technical level, and the image super-resolution algorithm can play a role in this field. Through the research and analysis of the mechanism and application effect of a variety of different super-resolution algorithms, the enhanced super-resolution adversarial generation network with good effect in the field of explosion and impact is selected, which has a good effect on image features and edge contour recognition of objects. In this paper, the algorithm is applied to the scenarios of encounter between the projectile and the target, fragmentation field, shock wave field, thermal effect analysis, etc., and the super-resolution enhanced damage scene map is quickly obtained, which provides reliable data support for the accurate analysis of the damage element.
Numerical simulation of shaped charge jet forming and penetrating characteristics of anti-armor and anti-personnel composite warhead
Authors: Wang C X , Ren X T , Zhang Y 
Published: December 2024

Abstract
The anti-armor and anti-personnel composite warhead is a kind of high-efficiency warhead with both anti-armor and anti-personnel effect, which is suitable for weapons such as cruise missile and UAV-brone ammunition. Based on the ANSYS/LS-DYNA numerical simulation software, the influence of the structural parameters of the biconical warhead on the forming characteristics and anti-armor power of the shaped charge jet was studied. The results show that the main mechanism of fragment influence on jet forming characteristics is to reduce the driving pressure of detonation by reducing the charge mass. Prefabricated fragments have little delay effect on radial rarefaction wave propagation in detonation products, and the existence of fragments increases the penetration depth by 1.41% under the same charge mass. The research results provide a useful reference for the overall structure design, material selection and structure optimization of the anti-armor and anti-personnel composite warhead.
Research on the Correlation between the Barrel Temperature and the Parameters of Interior Ballistic and Charge
Authors: Zhu Wenfang , Feng Yuan , Wang Yuwei , Qu Yingzhi 
Published: December 2024

Abstract
Aiming at the problem that the barrel life of a large calibre artillery is obviously lower than the international advanced level, and the thermal erosion inside the barrel is serious, based on modern interior ballistic theory and heat transfer theory, a simulation of one-dimensional two-phase flow interior ballistic, heat exchange process between gas-solid two-phase flow and the barrel is carried out. The influence of maximum pressure in bore, charge, propellant explosion temperature, barrel structure and other parameters on the barrel temperature is obtained, and the correlation between the barrel temperature and parameters of interior ballistic and charge is analyzed, providing direction for the design of low-ablation interior ballistic and charge.
Gas-Liquid Separation of Liquid Hydrogen in Microgravity: Optimization of Structural Parameters, Angles, Rotational Speeds, and Gas-Liquid Ratios
Authors: Li Zehao , Xu Wenlong , Zhu Honglai , Gao Yaru , Chen Chongwu , Zhao Haitao 
Published: December 2024

Abstract
Liquid hydrogen (LH2) is a high-efficiency cryogenic propellant extensively used in the aerospace industry due to its superior specific impulse and energy density. Despite its advantages, managing LH2 in orbit presents significant challenges, particularly in microgravity, where fluid transport and gas-liquid interface stability are adversely affected. This study addresses these challenges by investigating the effects of different structural parameters, angles, rotational speeds, and gas-liquid ratios on LH2 gas-liquid separation through comprehensive numerical simulations validations. We analyze the impacts of various pore diameters and axial spacings, as well as the evolution of gas-liquid configurations at different angles and rotational speeds. Additionally, we explore the effects of different gas-liquid ratios on separation performance. Our findings identify optimal parameter combinations and elucidate key mechanisms influencing gas-liquid separation efficiency. The study employs high-precision models and microgravity simulation experiments to validate the numerical results, providing a robust foundation for optimizing LH2 management devices. This research contributes valuable insights into the management of liquid hydrogen (LH2) in microgravity environments and provides foundational knowledge that may benefit future deep-space exploration missions.
Study on the leakage mechanism of sealing with hyperelastic rough surfaces based on iterative algorithm
Authors: Jiang C Y , Lin X X , Li X , Sun S J , Wang L J , Yang B 
Published: December 2024

Abstract
The sealing structures, found in various equipment used in daily life, industry, and the military, play roles in preventing leaks, contamination, and toxic gases. This study focuses on the sealing interface of hyperelastic rough surface, employing an iterative algorithm to calculate the leakage process under fluid action and determine the critical leakage pressure. By substituting the fluid load on the sealing interface before leakage with a uniformly distributed pressure, this algorithm accurately identifies the boundaries of fluid and sealing contact regions through continuous iteration. Consequently, it solves the sealing interface state under a certain pressure and incrementally increases the hydrostatic pressure to obtain the critical leakage pressure. This research visualizes the sealing leakage process and determines the critical leakage pressure of the sealing interface, offering practical value for engineering applications and providing guidance for the design and manufacturing methods of sealing components.
Bidirectional dual closed-loop trajectory tracking control based on chassis model identification
Authors: Dai Changhua , Wang Dingheng , Yang Wei , Zhang Yue , Duan Yuanchao , Lu Yongchao , Zhao Kai 
Published: December 2024

Abstract
The field of trajectory tracking control for ground vehicles has problems such as unknown control object manipulation characteristics, missing dynamic digital models, and susceptibility to distortion of upper-layer tracking control algorithms. This paper first proposes a method for identifying the chassis forward/inverse dynamics model based on vehicle-level state variables and control variable methods to solve these issues. Secondly, the control object manipulation characteristics and dynamic fitting digital model are obtained based on a specific electric drive-tracked chassis. Thirdly, a linear quadratic regulator is used as the core path tracking algorithm, and a dual closed-loop trajectory tracking control algorithm based on the inverse dynamics fitting model is established for both lateral and longitudinal position feedforward + velocity feedback correction. Finally, systematic verification is conducted using the Simulink simulation environment and real vehicles. The verification results show that the proposed model identification method supports vehicle-level state fitting accuracy maintained within 3%, and the trajectory tracking control algorithm maintains tracking accuracy within 0.1m under extreme U-turn conditions. The dual closed-loop control structure enhances control accuracy and robustness.
The Fast Super-Twisting Sliding Mode Controller for a Class of Coaxial UAVs with Disturbance
Authors: Wang Yanqin , Fu Jian , Chen Zhi , Zhou Jie 
Published: December 2024

Abstract
In response to the flight attitude control issue of coaxial UAVs, a non-singular fast Super-Twisting sliding mode control algorithm for the attitude feedback control system is proposed. By analyzing the flight states of the coaxial UAV, a new nonsingular fast terminal Super-Twisting sliding mode control algorithm is designed for the attitude control system of UAV with established mathematical model. The experimental results show the effectiveness, stability and rapidity of proposed algorithm for the coaxial UAV, which are better than traditional sliding mode control algorithm.
Analysis of Application and Development of Sealing Structures for Special Vehicle Doors and Covers
Authors: Yan Zhiwu , Wu Kun , Liu Fang , Bao Zhiguang , Zhang Hongwei , Zhang Jiao , Wang Dehai , Zhao Ruoshi , Hou Liming 
Published: December 2024

Abstract
Special vehicles are equipped with doors and covers at various parts of the hull to meet the needs of personnel entry and exit as well as maintenance and servicing due to the functional and human factors engineering requirements. The airtight and watertight performance of these doors and covers directly affects the vehicle’s capabilities for biological and chemical protection and its ability to fording. A failure in sealing could endanger the safety of personnel inside the vehicle, and the sealing performance of doors and covers is closely related to the design of the sealing structure. Focusing on the design and usage characteristics of doors and covers for special vehicles, this paper analyzes various aspects including sealing mechanisms, sealing forms, and sealing structures. It discusses practical examples of sealing structures for doors and covers on special vehicles, and identifies the basic structural forms and development trends of sealing for doors and covers on special vehicles.