Defence Technology(防务技术)最新文献_第7页

Modification of a ReaxFF potential at short range for energetic materials 为高能材料修改近距离 ReaxFF 电位

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.07.013

Weiyi Li , Tao Wang , Wenhua Li , Jintao Wang , Wanxiao Guo , Zexin Jiang , Yilin Fang , Xiyao Yun , Ning Gao

{"title":"Modification of a ReaxFF potential at short range for energetic materials","authors":"Weiyi Li , Tao Wang , Wenhua Li , Jintao Wang , Wanxiao Guo , Zexin Jiang , Yilin Fang , Xiyao Yun , Ning Gao","doi":"10.1016/j.dt.2024.07.013","DOIUrl":"10.1016/j.dt.2024.07.013","url":null,"abstract":"<div><div>The ReaxFF can describe the properties of energetic materials (EMs) at equilibrium state, but does not work properly in simulating high-energy particle irradiation process because of its weak short-range interaction. In this paper, a modification was made for such a potential by connecting Ziegler-Biersack-Littmark (ZBL) potential to ReaxFF-lg through comparing to Density Functional Theory (DFT) results to accurately describe short-range interactions. After modification, the newly fitted ReaxFF-lg/ZBL potential predicts better the equation of state for EMs In displacement cascade simulations, comparing to results from ab initio molecular dynamics (AIMD), ReaxFF-lg/ZBL presented the similar transferred energy from a primary knock-on atom to surrounding atoms, better than the original ReaxFF-lg potential. Further large-scale displacement cascade simulations indicated ReaxFF-lg/ZBL could be applied for cascade simulations with PKA energy from less than 1 keV to high energy (e.g. 35 keV) cases, which is suitable for effectively simulating high-energy displacement cascades in EMs using molecular dynamics method.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 176-182"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141845384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-velocity projectile penetration test and theoretical calculation of pseudo fluid penetration of calcareous sand

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.05.016

Wei Guo , Yanyu Qiu , Mingyang Wang

引用次数: 0

Optimization of mechanical and safety properties by designing interface characteristics within energetic composites 通过设计高能复合材料的界面特性优化机械和安全性能

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.08.007

Guijun Wang, Yanqing Wu, Kun Yang, Quanzhi Xia, Fenglei Huang

{"title":"Optimization of mechanical and safety properties by designing interface characteristics within energetic composites","authors":"Guijun Wang, Yanqing Wu, Kun Yang, Quanzhi Xia, Fenglei Huang","doi":"10.1016/j.dt.2024.08.007","DOIUrl":"10.1016/j.dt.2024.08.007","url":null,"abstract":"<div><div>The interfacial structure has an important effect on the mechanical properties and safety of the energetic material. In this work, a mesostructure model reflecting the real internal structure of PBX is established through image digital modeling and vectorization processing technology. The microscopic molecular structure model of PBX is constructed by molecular dynamics, and the interface bonding energy is calculated and transferred to the mesostructure model. Numerical simulations are used to study the influence of the interface roughness on the dynamic compression and impact ignition response of PBX, and to regulate and optimize the mechanical properties and safety of the explosive to obtain the optimal design of the surface roughness of the explosive crystal. The results show that the critical hot spot density of PBX ignition under impact loading is 0.68 mm<sup>−2</sup>. The improvement of crystal surface roughness can improve the mechanical properties of materials, but at the same time it can improve the impact ignition sensitivity and reduce the safety of materials. The optimal friction coefficient range for the crystal surface that satisfies both the mechanical properties and safety of PBX is 0.06–0.12. This work can provide a reference basis for the formulation design and production processing of energetic materials.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 59-72"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142189180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on the exploding foil initiators ignition enhanced by explosion-electricity coupling 通过爆炸-电耦合增强爆炸箔引发器点火的研究

IF 5

Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.06.013

Songmao Zhao , Haotian Jian , Ke Wang , Zheng Ning , Peng Zhu , Ruiqi Shen

{"title":"Investigation on the exploding foil initiators ignition enhanced by explosion-electricity coupling","authors":"Songmao Zhao , Haotian Jian , Ke Wang , Zheng Ning , Peng Zhu , Ruiqi Shen","doi":"10.1016/j.dt.2024.06.013","DOIUrl":"10.1016/j.dt.2024.06.013","url":null,"abstract":"<div><div>Explosion-electricity coupling (EEC) is a technical method to induce electric energy into the plasma material produced by explosion to improve the output of explosion. Exploding foil initiator (EFI) which could produce plasma during electric explosion can serve as a good carrier for studying the EEC. To investigate the enhancement ability and mechanism of EEC in EFI ignition performance, a kind of EFI chips which could realize the EEC effect was designed and fabricated to observe the characteristics of current and voltage, flyer and plasma temperature during Boron Potassium Nitrate (BPN) ignition of the EFI. It was found that the EEC could enhance EFI ignition in terms of energy utilization, ignition contact surface, and high-temperature sustainability of plasma: firstly, the EEC prolonged the late time discharge (LTD) phase of the electric explosion, making the energy of capacitor effectively utilized; secondly, the EEC could create a larger area of ignition contact surface; last of all, the EEC effect enhanced its high-temperature sustainability by sustaining continuous energy input to plasma. It also was found that the ignition voltage of BPN could be reduced by nearly 600 V under the condition of 0.4 μF capacitance. The research has successfully combined EEC with EFI, revealing the behavioral characteristics of EEC and demonstrating its effective enhancement of EFI ignition. It introduces a new approach to improving EFI output, which is conducive to low-energy ignition of EFI, and expected to take the ignition technology of EFI to a new level.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 1-11"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comprehensive survey of cyberattacks on EVs: Research domains, attacks, defensive mechanisms, and verification methods 电动汽车网络攻击综合调查：研究领域、攻击、防御机制和验证方法

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.06.009

Tawfiq Aljohani , Abdulaziz Almutairi

{"title":"A comprehensive survey of cyberattacks on EVs: Research domains, attacks, defensive mechanisms, and verification methods","authors":"Tawfiq Aljohani , Abdulaziz Almutairi","doi":"10.1016/j.dt.2024.06.009","DOIUrl":"10.1016/j.dt.2024.06.009","url":null,"abstract":"<div><div>With the continuous development of transportation electrification, the cybersecurity of energy infrastructure has become increasingly prominent. Explicitly, EVs resemble a significant tool to carryout cyberattacks since EVs are not only seen as dynamic loads but also as mobile energy sources that establish two-way communications with several players in the grid. This taxonomy aims to provide a comprehensive overview of cyberattacks against EVs from four distinct perspectives. The first is the research domains of EVs application, which investigates the different fields of research related to the development and application of EVs and how they are susceptible to cyber threats. The second is the CIA-based attacks, which examines the threats to the confidentiality, integrity, and availability of EVs' sensitive information and critical systems. The third taxonomy discusses the countermeasures and defensive mechanisms to secure the EVs against cyberattacks, including preventive measures, detection algorithms, response strategy, and recovery techniques. The fourth taxonomy is the verification and validation methodologies, which explores the software tools and hardware testbeds used to test and evaluate the security of EVs against cyber threats. Finally, this taxonomy presents an understanding of the current state of cyberattacks against EVs and serves as a valuable resource for researchers and practitioners in the fields of cybersecurity and electric mobility.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 31-58"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141948365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and microwave absorption performance of SiC aerogel via sol-gel and carbonization reduction process 通过溶胶-凝胶和碳化还原工艺制备碳化硅气凝胶及其微波吸收性能

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.08.006

Xinli Ye , Pengyi Xu , Hao Yu , Shan Li , Xiaomin Ma , Wei Xu , Junxiong Zhang

引用次数: 0

Design, fabrication and performance test of an integrated exploding foil initiator system 集成爆炸箔引发器系统的设计、制造和性能测试

IF 5

Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.06.012

Zehao Wang , Pengfei Xue , Qingxuan Zeng , Mingyu Li

{"title":"Design, fabrication and performance test of an integrated exploding foil initiator system","authors":"Zehao Wang , Pengfei Xue , Qingxuan Zeng , Mingyu Li","doi":"10.1016/j.dt.2024.06.012","DOIUrl":"10.1016/j.dt.2024.06.012","url":null,"abstract":"<div><div>The integration method of exploding foil initiator system (EFIs) used to be researched to broaden its application range in military and aerospace in the last few decades. In order to lower the firing voltage below 1 kV, an integrated EFIs with enhanced energy efficiency was designed. Corresponding exploding foil initiator chips were fabricated in batch via micro electromechanical systems technology by integrating a unified foil, a flyer layer and a barrel on a glass substrate successively, meanwhile its package of the whole system was proposed at a volume of 2.194 cm<sup>3</sup>. The structural parameters were determined by predicted performance including flyer velocity, impact behavior and conduction property via the proposed theoretical models and the static electric field simulation. As expect, this integrated EFIs exhibited excellent functions, which could accelerate the flyer to a terminal velocity over 4 km/s and preeminently initiate HNS-IV pellet at a circuit of 0.24 μF/0.9 kV. Furthermore, the theoretical design, fabrication and performance test have been all included to validate the feasibility of this integrated EFIs that was beneficial for its commercial development in the future.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 125-135"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141784749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mission-oriented capability evaluation for combat network based on operation loops 基于操作循环的面向任务的作战网络能力评估

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.07.002

Yang Wang , Junyong Tao , Xiaoke Zhang , Guanghan Bai , Yunan Zhang

{"title":"Mission-oriented capability evaluation for combat network based on operation loops","authors":"Yang Wang , Junyong Tao , Xiaoke Zhang , Guanghan Bai , Yunan Zhang","doi":"10.1016/j.dt.2024.07.002","DOIUrl":"10.1016/j.dt.2024.07.002","url":null,"abstract":"<div><div>With continuous growth in scale, topology complexity, mission phases, and mission diversity, challenges have been placed for efficient capability evaluation of modern combat systems. Aiming at the problems of insufficient mission consideration and single evaluation dimension in the existing evaluation approaches, this study proposes a mission-oriented capability evaluation method for combat systems based on operation loop. Firstly, a combat network model is given that takes into account the capability properties of combat nodes. Then, based on the transition matrix between combat nodes, an efficient algorithm for operation loop identification is proposed based on the Breadth-First Search. Given the mission-capability satisfaction of nodes, the effectiveness evaluation indexes for operation loops and combat network are proposed, followed by node importance measure. Through a case study of the combat scenario involving space-based support against surface ships under different strategies, the effectiveness of the proposed method is verified. The results indicated that the ROI-priority attack method has a notable impact on reducing the overall efficiency of the network, whereas the O-L betweenness-priority attack is more effective in obstructing the successful execution of enemy attack missions.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 156-175"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141706459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of iron aluminide Fe3Al with armour steel in ballistic behaviour

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.08.005

Pavel Hanus , Milan Pecanac , Mirjana Trivkovic , Savo Bojić , Sebastian Balos

{"title":"Comparison of iron aluminide Fe3Al with armour steel in ballistic behaviour","authors":"Pavel Hanus , Milan Pecanac , Mirjana Trivkovic , Savo Bojić , Sebastian Balos","doi":"10.1016/j.dt.2024.08.005","DOIUrl":"10.1016/j.dt.2024.08.005","url":null,"abstract":"<div><div>Intermetallic aluminide compounds possess several potential advantages compared to alloyed steels, like enhanced oxidation resistance, lower density and the omittance of critical raw materials. Iron aluminides, compared to other transition metal–aluminides of TM<sub>3</sub>-Al type, although having a higher density compared to titan-aluminides, have a lower density compared to nickel-aluminides, but also a higher ductility than both alternatives, making this material potentially effective in ballistic protection application. Density–wise, this material may be a worthy alternative to armour steels, which was the aim of this study. Two materials, Fe<sub>3</sub>Al intermetallic compound (F3A-C) and Armox 500 armour steel were ballistically tested against tungsten-carbide (WC) armour-piercing ammunition, in accordance with STANAG 4569. After ballistic testing, microhardness and metallographic testing were performed, revealing differences in strain hardening, crack propagation mode and exit hole morphology. F3A-C ballistic resistance is similar to that of armour steel, in spite of the lower tensile and impact mechanical properties, relying on a considerably higher strain hardening rate, thermal properties and a lower density.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 183-190"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A survey of data-centric technologies supporting decision-making before deploying military assets 对支持军事资产部署前决策的以数据为中心的技术的调查

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Defence Technology(防务技术) Pub Date : 2024-12-01 DOI: 10.1016/j.dt.2024.07.012

Alexandra Zabala-López , Mario Linares-Vásquez , Sonia Haiduc , Yezid Donoso

{"title":"A survey of data-centric technologies supporting decision-making before deploying military assets","authors":"Alexandra Zabala-López , Mario Linares-Vásquez , Sonia Haiduc , Yezid Donoso","doi":"10.1016/j.dt.2024.07.012","DOIUrl":"10.1016/j.dt.2024.07.012","url":null,"abstract":"<div><div>In a time characterized by the availability of vast amounts of data, the effective utilization of information is critical for timely decision-making in military operations. However, processing large amounts of data requires computational resources and time. Therefore, decision makers have used data-centric technologies to take advantage of public and private data sources to support military operations. This survey explores the integration and application of data-centric technologies, such as data analytics, data science, and machine learning, to optimize decision-making workflows within military contexts supporting the deployment of military assets and resources. To address the information gap, this article presents a literature review, specifically a survey. Our survey examines the use of the mentioned technologies to process and analyze information that contributes to the phases of situational awareness, and planning in military environments. We then introduce a taxonomy of the approaches associated with implementing these technologies in military scenarios. Furthermore, we discuss relevant factors for the seamless integration of data-centric technologies into military decision-making processes, and reveal the importance of specialized personnel, architectures, and cybersecurity issues in the task of developing prototypes and models. The findings of this paper aim to provide valuable insights for military institutions, offering a deeper understanding of the use of data-centric technologies as innovative practices to enhance the effectiveness of military decision-making.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"42 ","pages":"Pages 226-246"},"PeriodicalIF":5.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141846771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0