Defence Technology(防务技术)最新文献_第9页

The hydrodynamic RAM effect: Review of historic experiments, model developments and simulation 水动力 RAM 效应：历史实验、模型开发和模拟回顾

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.07.010

Georg A. Heilig, Michael May

引用次数: 0

Microstructure and mechanical properties of welds of AZ31B magnesium alloy produced by different gas tungsten arc welding variants 不同气体钨极电弧焊变体AZ31B镁合金焊缝组织与力学性能

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.08.019

S. Srinivasan , R. Ravi Bharath , A. Atrens , P. Bala Srinivasan

{"title":"Microstructure and mechanical properties of welds of AZ31B magnesium alloy produced by different gas tungsten arc welding variants","authors":"S. Srinivasan , R. Ravi Bharath , A. Atrens , P. Bala Srinivasan","doi":"10.1016/j.dt.2024.08.019","DOIUrl":"10.1016/j.dt.2024.08.019","url":null,"abstract":"<div><div>This work aimed to (i) understand conventional and pulse gas tungsten arc welding (GTAW) of AZ31B, and (ii) explore high frequency welding (100 Hz–1500 Hz). GTA welding with alternating current (AC) and direct current electrode positive (DCEP) polarities yielded crack-free partial penetration welds for 6 mm thick AZ31B alloy sheet. Welding under direct current electrode negative (DCEN) polarity with identical parameters as that for AC and DCEP resulted in full penetration welds that had microcracks. Defect-free full-penetration welds could be accomplished with pulse GTA welding using DCEN polarity at a pulse frequency of 1 Hz with a pulse duration ratio of 1:1. The resultant DCEN P 1:1 weld metal had a microstructure finer than the conventional DCEN weld. Welds produced with pulse duration ratios of 1:2 and 1:4 lacked penetration but had a much finer microstructures because of the lower heat input. The arc constriction by the high frequency pulsing in the ActivArc®-High frequency (AA-HF) mode welding was responsible for deeper penetration. Welds produced under DCEN pulsing and AA-HF conditions had hardness higher than conventional DCEN, DCEP and AC GTA welds, attributed to the finer microstructure. AA-HF GTA welding produced defect free deeper penetration welds with good microstructural features/mechanical properties and also gave an advantage of 50% enhanced productivity when welded at 1500 Hz.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 98-110"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436868","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

Evaluation of detonation performance of explosives ICM-101, ONC, and TNAZ based on improved VHL equation of state 基于改进VHL状态方程的ICM-101、ONC和TNAZ炸药爆轰性能评价

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.10.007

Yong Han , Qin Liu , Yingliang Duan , Yaqi Zhao , Xinping Long

{"title":"Evaluation of detonation performance of explosives ICM-101, ONC, and TNAZ based on improved VHL equation of state","authors":"Yong Han , Qin Liu , Yingliang Duan , Yaqi Zhao , Xinping Long","doi":"10.1016/j.dt.2024.10.007","DOIUrl":"10.1016/j.dt.2024.10.007","url":null,"abstract":"<div><div>Detonation performance is crucial for evaluating the power of high explosives (HEs), and the equation of state (EOS) that accurately describes the high-temperature, high-pressure, and high-temperature, medium-pressure states of detonation products is key to assessing the damage efficiency of these energetic materials. This article examines the limitations of the VLW EOS in representing the thermodynamic states of explosive detonation gas products under high-temperature and medium-to high-pressure conditions. A new gas EOS for detonation products, called VHL (Virial-Han-Long), is proposed. The accuracy of VHL in describing gas states under high-temperature and medium-to high-pressure conditions is verified, and its performance in evaluating explosive detonation and working capabilities is explored. The results demonstrate that VHL exhibits high precision in calculating detonation performance. Subsequently, the detonation performance of three new HEs (ICM-101, ONC, and TNAZ) was calculated and compared to traditional HEs (TATB, CL-20, and HMX). The results indicate that ONC has superior detonation performance compared to the other explosives, while ICM-101 shows a detonation velocity similar to CL-20 but with slightly lower detonation pressure. The detonation characteristics of TNAZ are comparable to those of the standard HE HMX. From the perspective of products, considering the comprehensive work performance (mechanical work and detonation heat), both ONC and ICM-101 demonstrate relatively superior performance.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 83-97"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436867","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-thermal free vibration analysis of functionally graded microplates using a new finite element formulation based on TSDT and MSCT 基于TSDT和MSCT的功能梯度微板高热自由振动有限元分析

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.08.013

Huu Trong Dang , Nhan Thinh Hoang , Quoc Hoa Pham , Trung Thanh Tran , Huy Gia Luong

{"title":"High-thermal free vibration analysis of functionally graded microplates using a new finite element formulation based on TSDT and MSCT","authors":"Huu Trong Dang , Nhan Thinh Hoang , Quoc Hoa Pham , Trung Thanh Tran , Huy Gia Luong","doi":"10.1016/j.dt.2024.08.013","DOIUrl":"10.1016/j.dt.2024.08.013","url":null,"abstract":"<div><div>Recent advancements in additive manufacturing (AM) have revolutionized the design and production of complex engineering microstructures. Despite these advancements, their mathematical modeling and computational analysis remain significant challenges. This research aims to develop an effective computational method for analyzing the free vibration of functionally graded (FG) microplates under high temperatures while resting on a Pasternak foundation (PF). This formulation leverages a new third-order shear deformation theory (new TSDT) for improved accuracy without requiring shear correction factors. Additionally, the modified couple stress theory (MCST) is incorporated to account for size-dependent effects in microplates. The PF is characterized by two parameters including spring stiffness (<span><math><mrow><msub><mi>k</mi><mi>w</mi></msub></mrow></math></span>) and shear layer stiffness (<span><math><mrow><msub><mi>k</mi><mi>s</mi></msub></mrow></math></span>). To validate the proposed method, the results obtained are compared with those of the existing literature. Furthermore, numerical examples explore the influence of various factors on the high-temperature free vibration of FG microplates. These factors include the length scale parameter (<span><math><mrow><mi>l</mi></mrow></math></span>), geometric dimensions, material properties, and the presence of the elastic foundation. The findings significantly enhance our comprehension of the free vibration of FG microplates in high thermal environments. In addition, the findings significantly enhance our comprehension of the free vibration of FG microplates in high thermal environments. In addition, the results of this research will have great potential in military and defense applications such as components of submarines, fighter aircraft, and missiles.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 131-149"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436869","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

Enhanced engineering and biocidal polypropylene filaments enabling melt reduction of AgNO3 through PVP agent: A scalable process for the defense industry with MEX additive manufacturing 通过 PVP 剂熔融还原 AgNO3，增强工程和杀菌聚丙烯长丝：采用 MEX 快速成型技术的可扩展国防工业工艺

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.09.007

Markos Petousis , Nikolaos Michailidis , Vassilis Papadakis , Apostolos Argyros , Mariza Spiridaki , Nikolaos Mountakis , John Valsamos , Nektarios K. Nasikas , Amalia Moutsopoulou , Nectarios Vidakis

{"title":"Enhanced engineering and biocidal polypropylene filaments enabling melt reduction of AgNO3 through PVP agent: A scalable process for the defense industry with MEX additive manufacturing","authors":"Markos Petousis , Nikolaos Michailidis , Vassilis Papadakis , Apostolos Argyros , Mariza Spiridaki , Nikolaos Mountakis , John Valsamos , Nektarios K. Nasikas , Amalia Moutsopoulou , Nectarios Vidakis","doi":"10.1016/j.dt.2024.09.007","DOIUrl":"10.1016/j.dt.2024.09.007","url":null,"abstract":"<div><div>This study focused on the production of polypropylene (PP)/silver (Ag) composites via additive manufacturing. This study aimed to enhance the quality of medical-grade PP in material extrusion (MEX) three-dimensional printing (3DP) by improving its mechanical properties while simultaneously adding antibacterial properties. The latter can find extremely important and versatile properties that are applicable in defense and security domains. PP/Ag nanocomposites were prepared using a novel method based on a reaction occurring while mixing appropriate quantities of the starting polymers and additives, namely polyvinylpyrrolidone (PVP) as the matrix material and silver nitrate (AgNO<sub>3</sub>) as the filler. This process produced three-dimensional (3D) printed filaments, which were then used to create specimens for a series of standardized tests. It was found that the mechanical properties of the nanocomposites were enhanced in relation to pristine PP, especially for the PP matrix with various loadings of AgNO<sub>3</sub> and PVP, such as 5.0 wt% and 2.5 wt%, respectively. The voids, inclusions, and actual-to-nominal dimensions also showed improved results. The 3DP specimens exhibited a more effective biocidal performance against Staphylococcus aureus than Escherichia coli, which developed an inhibition zone only in the case of PP with filler loading percentages of AgNO<sub>3</sub> and PVP at 10.0 wt% and 5.0 wt%, respectively Compounds possessing such properties can be beneficial for various applications requiring increased mechanical properties and biocidal capabilities, such as in the Defence or medical industries.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 52-66"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436947","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 of mixing performance and safety characteristics of polymer-based energetic materials simulant via screw-pressing blending extrusion charges 基于螺杆挤压混炼料的高分子含能材料模拟料混炼性能及安全特性研究

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.10.008

Gaoming Lin , Huzeng Zong , Suwei Wang , Huang Chen , Siyu Yu , Xiaojie Hao , Kang Wang , Yuanyuan Li , Guohui Zhang

{"title":"Investigation of mixing performance and safety characteristics of polymer-based energetic materials simulant via screw-pressing blending extrusion charges","authors":"Gaoming Lin , Huzeng Zong , Suwei Wang , Huang Chen , Siyu Yu , Xiaojie Hao , Kang Wang , Yuanyuan Li , Guohui Zhang","doi":"10.1016/j.dt.2024.10.008","DOIUrl":"10.1016/j.dt.2024.10.008","url":null,"abstract":"<div><div>The present study introduces a screw-pressing charging method to tackle deficiencies in automation and charge uniformity during the melt-casting of polymer-based energetic materials. To ensure the safety of the experiments, this study used inert materials with similar physical properties to partially substitute for the actual energetic components in the preparation of simulant materials. By thoroughly analyzing slurry physical properties, a simulation framework and an extensive performance evaluation method were developed. Such tools guide the design of the structure and configuration of process parameters. Results demonstrate that employing the Pin element significantly enhances radial mixing within the screw, minimizes temperature variations in the slurry, and improves both efficiency and safety in the mixing process. Further, adjustments such as widening the cone angle of the barrel, modifying the solid content of the slurry, and varying the speed of the screw can optimize the mechanical and thermal coupling in the flow field. These adjustments promote higher-quality slurry and create a safer production environment for the extrusion process.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 287-305"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436953","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

Utilizing electronic assisted enhancement: An innovative approach for studying the thermal decomposition and combustion of ionic liquids 利用电子辅助增强：一种研究离子液体热分解和燃烧的创新方法

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.09.001

Cailing Zhang , Yutao Wang , Baiquan Chen , Zhenguo Pang , Hongqi Nie , Quan Zhu , Peijin Liu , Wei He

{"title":"Utilizing electronic assisted enhancement: An innovative approach for studying the thermal decomposition and combustion of ionic liquids","authors":"Cailing Zhang , Yutao Wang , Baiquan Chen , Zhenguo Pang , Hongqi Nie , Quan Zhu , Peijin Liu , Wei He","doi":"10.1016/j.dt.2024.09.001","DOIUrl":"10.1016/j.dt.2024.09.001","url":null,"abstract":"<div><div>Flammable ionic liquids exhibit high conductivity and a broad electrochemical window, enabling the generation of combustible gases for combustion via electrochemical decomposition and thermal decomposition. This characteristic holds significant implications in the realm of novel satellite propulsion. Introducing a fraction of the electrical energy into energetic ionic liquid fuels, the thermal decomposition process is facilitated by reducing the apparent activation energy required, and electrical energy can trigger the electrochemical decomposition of ionic liquids, presenting a promising approach to enhance combustion efficiency and energy release. This study applied an external voltage during the thermal decomposition of 1-ethyl-3-methylimidazole nitrate ([EMIm]NO<sub>3</sub>), revealing the effective alteration of the activation energy of [EMIm]NO<sub>3</sub>. The pyrolysis, electrochemical decomposition, and electron assisted enhancement products were identified through Thermogravimetry–Differential scanning calorimetry–Fourier transform infrared-Mass spectrometry (TG-DSC-FTIR-MS) and gas chromatography (GC) analyses, elucidating the degradation mechanism of [EMIm]NO<sub>3</sub>. Furthermore, an external voltage was introduced during the combustion of [EMIm]NO<sub>3</sub>, demonstrating the impact of voltage on the combustion process.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 179-189"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436870","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

Mode-switching cooperative defense strategy for the orbit pursuit-evasion-defense game 轨道追逐-逃避-防御博弈的模式切换合作防御策略

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.10.006

Yongshang Wei, Tianxi Liu, Cheng Wei

{"title":"Mode-switching cooperative defense strategy for the orbit pursuit-evasion-defense game","authors":"Yongshang Wei, Tianxi Liu, Cheng Wei","doi":"10.1016/j.dt.2024.10.006","DOIUrl":"10.1016/j.dt.2024.10.006","url":null,"abstract":"<div><div>This paper presents a mode-switching collaborative defense strategy for spacecraft pursuit-evasion-defense scenarios. In these scenarios, the pursuer tries to avoid the defender while capturing the evader, while the evader and defender form an alliance to prevent the pursuer from achieving its goal. First, the behavioral modes of the pursuer, including attack and avoidance modes, were established using differential game theory. These modes are then recognized by an interactive multiple model-matching algorithm (IMM), that uses several smooth variable structure filters to match the modes of the pursuer and update their probabilities in real time. Based on the linear-quadratic optimization theory, combined with the results of strategy identification, a two-way cooperative optimal strategy for the defender and evader is proposed, where the evader aids the defender to intercept the pursuer by performing luring maneuvers. Simulation results show that the interactive multi-model algorithm based on several smooth variable structure filters perform well in the strategy identification of the pursuer, and the cooperative defense strategy based on strategy identification has good interception performance when facing pursuers, who are able to flexibly adjust their game objectives.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 272-286"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143436952","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 novel transient strategy: transient electronics based on energetic materials 新型瞬态战略：基于高能材料的瞬态电子器件

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.04.013

Yutao Wang , Zhongliang Ma , Wei He , Yongli Zhang , Peijin Liu

引用次数: 0

Synthesis of energetic materials by microfluidics 利用微流体技术合成高能材料

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Defence Technology(防务技术) Pub Date : 2025-02-01 DOI: 10.1016/j.dt.2024.06.002

Shuo Liu , Chuanyu Zhang , Yanlan Wang , Xueyong Wei

{"title":"Synthesis of energetic materials by microfluidics","authors":"Shuo Liu , Chuanyu Zhang , Yanlan Wang , Xueyong Wei","doi":"10.1016/j.dt.2024.06.002","DOIUrl":"10.1016/j.dt.2024.06.002","url":null,"abstract":"<div><div>Energetic materials, characterized by their capacity to store and release substantial energy, hold pivotal significance in some fields, particularly in defense applications. Microfluidics, with its ability to manipulate fluids and facilitate droplet formation at the microscale, enables precise control of chemical reactions. Recent scholarly endeavors have increasingly harnessed microfluidic reactors in the realm of energetic materials, yielding morphologically controllable particles with enhanced uniformity and explosive efficacy. However, crucial insights into microfluidic-based methodologies are dispersed across various publications, necessitating a systematic compilation. Accordingly, this review addresses this gap by concentrating on the synthesis of energetic materials through microfluidics. Specifically, the methods based on micro-mixing and droplets in the previous papers are summarized and the strategies to control the critical parameters within chemical reactions are discussed in detail. Then, the comparison in terms of advantages and disadvantages is attempted. As demonstrated in the last section regarding perspectives, challenges such as clogging, dead zones, and suboptimal production yields are non-ignoble in the promising fields and they might be addressed by integrating sound, optics, or electrical energy to meet heightened requirements. This comprehensive overview aims to consolidate and analyze the diverse array of microfluidic approaches in energetic material synthesis, offering valuable insights for future research directions.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"44 ","pages":"Pages 306-319"},"PeriodicalIF":5.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141399177","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