Defence Technology(防务技术)最新文献

An isogeometric analysis approach for dynamic response of doubly-curved magneto electro elastic composite shallow shell subjected to blast loading 承受爆炸荷载的双曲面磁电弹性复合浅壳动态响应的等距分析方法

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Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.06.005

Pham Hoang Tu , Tran Van Ke , Vu Khac Trai , Le Hoai

{"title":"An isogeometric analysis approach for dynamic response of doubly-curved magneto electro elastic composite shallow shell subjected to blast loading","authors":"Pham Hoang Tu , Tran Van Ke , Vu Khac Trai , Le Hoai","doi":"10.1016/j.dt.2024.06.005","DOIUrl":"10.1016/j.dt.2024.06.005","url":null,"abstract":"<div><div>For the first time, the isogeometric analysis (IGA) approach is used to model and analyze free and forced vibrations of doubly-curved magneto-electro-elastic (MEE) composite shallow shell resting on the visco-Pasternak foundation in a hygro-temperature environment. The doubly-curved MEE shallow shell types include spherical shallow shell, cylindrical shallow shell, saddle shallow shell, and elliptical shallow shell subjected to blast load are investigated. The Maxwell equation and electromagnetic boundary conditions are used to determine the vary of the electric and magnetic potentials. The MEE shallow shell's equations of motion are derived from Hamilton's principle and refined higher-order shear theory. Then, the IGA method is used to derive the laws of natural frequencies and dynamic responses of the shell under various boundary conditions. The accuracy of the model and method is verified through reliable numerical comparisons. Aside from this, the impact of the input parameters on the free and forced vibration of the doubly-curved MEE shallow shell is examined in detail. These results may be useful in the design and manufacture of military structures such as warships, fighter aircraft, drones and missiles.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"41 ","pages":"Pages 159-180"},"PeriodicalIF":5.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141413316","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

Developing a highly scalable synthetic strategy for 5-amino-4-nitrobenzo[1,2-c:3,4-c']bis([1,2,5]oxadiazole)1,b-dioxide (CL-18) and investigating the influence of crystal engineering and positional isomerization on its safety and laser ignition performance 开发 5-氨基-4-硝基苯并[1,2-c:3,4-c']双([1,2,5]恶二唑)1,b-二氧化物 (CL-18) 的高度可扩展合成策略，并研究晶体工程和位置异构化对其安全性和激光点火性能的影响

IF 5

Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.06.008

Lei Yang, Zhenqi Zhang, Wei Du, Jinshan Li, Qing Ma

{"title":"Developing a highly scalable synthetic strategy for 5-amino-4-nitrobenzo[1,2-c:3,4-c']bis([1,2,5]oxadiazole)1,b-dioxide (CL-18) and investigating the influence of crystal engineering and positional isomerization on its safety and laser ignition performance","authors":"Lei Yang, Zhenqi Zhang, Wei Du, Jinshan Li, Qing Ma","doi":"10.1016/j.dt.2024.06.008","DOIUrl":"10.1016/j.dt.2024.06.008","url":null,"abstract":"<div><div>5-amino-4-nitrobenzo[1,2-c:3,4-c']bis([1,2,5]oxadiazole)1,6-dioxide (CL-18) exhibits significant potential as an initiating explosive. However, its current synthesis process remains non-scalable due to low yields and safety risks. In this study, we have developed a simple and safe synthetic route for CL-18. It was synthesized from 3,5-dihaloanisole in a four-step reaction with an overall yield exceeding 60%, surpassing all reported yields in the literature. Subsequently, recrystallization of CL-18 was successfully achieved by carefully selecting appropriate solvents and antisolvents to reduce its mechanical sensitivity. Ultimately, when DMF-ethanol was employed as the recrystallization solvent system, satisfactory product yield (>90%) and reduced mechanical sensitivity (IS = 15 J; FS = 216 N) were obtained. Additionally, CL-18 is derived from the rearrangement of oxygen atoms on i-CL-18 furoxan, and a comparative analysis of their physicochemical properties was conducted. The thermal stability of both compounds is similar, with onset decomposition temperatures recorded at 186 and 182 °C respectively. Similarly, they exhibit 5 s breaking point temperatures of 236 and 237 °C. Additionally, we present novel insights into the positional-isomerization-laser-ignition performance of CL-18 and its isomer i-CL-18 using laser irradiation for the first time. Remarkably, our findings demonstrate that i-CL-18 exhibits enhanced laser sensitivity, as it can be directly ignited by a 1064 nm wavelength laser, whereas CL-18 lacks this characteristic.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"41 ","pages":"Pages 13-21"},"PeriodicalIF":5.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141577788","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

Ti/WO3, a nanothermite for special purposes: An experimental study Ti/WO3，一种特殊用途的纳米热敏电阻：实验研究

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Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.06.010

Mateusz Polis , Agnieszka Stolarczyk , Konrad Szydlo , Tomasz Jarosz , Marcin Procek , Sebastian Slawski , Lukasz Hawelek

引用次数: 0

Modelling of internal ballistics of gun systems: A review 火炮系统内部弹道建模：综述

IF 5

Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.05.004

F. Ongaro, C. Robbe, A. Papy, B. Stirbu, A. Chabotier

{"title":"Modelling of internal ballistics of gun systems: A review","authors":"F. Ongaro, C. Robbe, A. Papy, B. Stirbu, A. Chabotier","doi":"10.1016/j.dt.2024.05.004","DOIUrl":"10.1016/j.dt.2024.05.004","url":null,"abstract":"<div><div>A deep understanding of the internal ballistic process and the factors affecting it is of primary importance to efficiently design a gun system and ensure its safe management. One of the main goals of internal ballistics is to estimate the gas pressure into the combustion chamber and the projectile muzzle velocity in order to use the propellant to its higher efficiency while avoiding over-pressure phenomena. Dealing with the internal ballistic problem is a complex undertaking since it requires handling the interaction between different constituents during a transient time lapse with very steep rise of pressure and temperature. Several approaches have been proposed in the literature, based on different assumptions and techniques. Generally, depending on the used mathematical framework, they can be classified into two categories: computational fluid dynamics-based models and lumped-parameter ones. By focusing on gun systems, this paper offers a review of the main contributions in the field by mentioning their advantages and drawbacks. An insight into the limitations of the currently available modelling strategies is provided, as well as some considerations on the choice of one model over another. Lumped-parameter models, for example, are a good candidate for performing parametric analysis and optimisation processes of gun systems, given their minimum requirements of computer resources. Conversely, CFD-based models have a better capacity to address more sophisticated phenomena like pressure waves and turbulent flow effects. The performed review also reveals that too little attention has been given to small calibre guns since the majority of currently available models are conceived for medium and large calibre gun systems. Similarly, aspects like wear phenomena, bore deformations or projectile-barrel interactions still need to be adequately addressed and our suggestion is to dedicate more effort on it.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"41 ","pages":"Pages 35-58"},"PeriodicalIF":5.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141029829","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 review of extreme condition effects on solder joint reliability: Understanding failure mechanisms 回顾极端条件对焊点可靠性的影响：了解失效机制

IF 5

Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.05.013

Norliza Ismail , Wan Yusmawati Wan Yusoff , Azuraida Amat , Nor Azlian Abdul Manaf , Nurazlin Ahmad

{"title":"A review of extreme condition effects on solder joint reliability: Understanding failure mechanisms","authors":"Norliza Ismail , Wan Yusmawati Wan Yusoff , Azuraida Amat , Nor Azlian Abdul Manaf , Nurazlin Ahmad","doi":"10.1016/j.dt.2024.05.013","DOIUrl":"10.1016/j.dt.2024.05.013","url":null,"abstract":"<div><div>Solder joint, crucial component in electronic systems, face significant challenges when exposed to extreme conditions during applications. The solder joint reliability involving microstructure and mechanical properties will be affected by extreme conditions. Understanding the behaviour of solder joints under extreme conditions is vital to determine the durability and reliability of solder joint. This review paper aims to comprehensively explore the underlying failure mechanism affecting solder joint reliability under extreme conditions. This study covers an in-depth analysis of effect extreme temperature, mechanical stress, and radiation conditions towards solder joint. Impact of each condition to the microstructure including solder matrix and intermetallic compound layer, and mechanical properties such as fatigue, shear strength, creep, and hardness was thoroughly discussed. The failure mechanisms were illustrated in graphical diagrams to ensure clarity and understanding. Furthermore, the paper highlighted mitigation strategies that enhancing solder joint reliability under challenging operating conditions. The findings offer valuable guidance for researchers, engineers, and practitioners involved in electronics, engineering, and related fields, fostering advancements in solder joint reliability and performance.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"41 ","pages":"Pages 134-158"},"PeriodicalIF":5.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141508323","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

An equivalent target plate damage probability calculation mathematics model and damage evaluation method 等效靶板损伤概率计算数学模型和损伤评估方法

IF 5

Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.06.006

Hanshan Li, Xiaoqian Zhang

{"title":"An equivalent target plate damage probability calculation mathematics model and damage evaluation method","authors":"Hanshan Li, Xiaoqian Zhang","doi":"10.1016/j.dt.2024.06.006","DOIUrl":"10.1016/j.dt.2024.06.006","url":null,"abstract":"<div><div>Aiming at the requirement of damage testing and evaluation of equivalent target plate based on the explosion of intelligent ammunition, this paper proposes a novel method for damage testing and evaluation method of circumferential equivalent target plate. Leveraging the dispersion characteristics parameters of fragment, we establish a calculation model of the fragment power situation and the damage calculation model under the condition of fragment ultimate penetration equivalent target plate. The damage model of equivalent target plate involves the fragment dispersion density, the local perforation damage criterion, the tearing damage model, and the damage probability. We use the camera to obtain the image of the equivalent target plate with fragment perforation, and research the algorithm of fragment distribution position recognition and fragment perforation area calculation method on the equivalent target plate by image processing technology. Based on the obtained parameters of the breakdown position and perforation area of fragments on equivalent target plate, we apply to damage calculation model of equivalent target plate, and calculate the damage probability of each equivalent target plate, and use the combined probabilistic damage calculation method to obtain the damage evaluation results of the circumferential equivalent target plate in an intelligent ammunition explosion experiment. Through an experimental testing, we verify the feasibility and rationality of the proposed damage evaluation method by comparison, the calculation results can reflect the actual damage effect of the equivalent target plate.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"41 ","pages":"Pages 82-103"},"PeriodicalIF":5.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141718500","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

Ballistic limit velocity of small caliber projectiles against SS400 steel plates: Live fire experiments and empirical models 小口径射弹对 SS400 钢板的弹道极限速度：实弹实验和经验模型

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Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.07.008

Jong-Hwan Kim , Seungwon Baik , Jirui Fu , Joon-Hyuk Park

引用次数: 0

Physics-informed machine learning model for prediction of ground reflected wave peak overpressure 预测地面反射波峰值超压的物理信息机器学习模型

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Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.06.004

Haoyu Zhang , Yuxin Xu , Lihan Xiao , Canjie Zhen

{"title":"Physics-informed machine learning model for prediction of ground reflected wave peak overpressure","authors":"Haoyu Zhang , Yuxin Xu , Lihan Xiao , Canjie Zhen","doi":"10.1016/j.dt.2024.06.004","DOIUrl":"10.1016/j.dt.2024.06.004","url":null,"abstract":"<div><div>The accurate prediction of peak overpressure of explosion shockwaves is significant in fields such as explosion hazard assessment and structural protection, where explosion shockwaves serve as typical destructive elements. Aiming at the problem of insufficient accuracy of the existing physical models for predicting the peak overpressure of ground reflected waves, two physics-informed machine learning models are constructed. The results demonstrate that the machine learning models, which incorporate physical information by predicting the deviation between the physical model and actual values and adding a physical loss term in the loss function, can accurately predict both the training and out-of-training dataset. Compared to existing physical models, the average relative error in the predicted training domain is reduced from 17.459%–48.588% to 2%, and the proportion of average relative error less than 20% increased from 0% to 59.4% to more than 99%. In addition, the relative average error outside the prediction training set range is reduced from 14.496%–29.389% to 5%, and the proportion of relative average error less than 20% increased from 0% to 71.39% to more than 99%. The inclusion of a physical loss term enforcing monotonicity in the loss function effectively improves the extrapolation performance of machine learning. The findings of this study provide valuable reference for explosion hazard assessment and anti-explosion structural design in various fields.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"41 ","pages":"Pages 119-133"},"PeriodicalIF":5.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141416463","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

Analysis model for damage of reinforced bars in RC beams under contact explosion 接触爆炸下钢筋混凝土梁中钢筋损坏的分析模型

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Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.03.003

Chaozhi Yang , Zhengxiang Huang , Xin Jia , Wei Shang , Jian Zhang

引用次数: 0

Composite armor philosophy (CAP): Holistic design methodology of multi-layered composite protection systems for armored vehicles 复合装甲理念（CAP）：装甲车辆多层复合防护系统的整体设计方法

IF 5

Defence Technology(防务技术) Pub Date : 2024-11-01 DOI: 10.1016/j.dt.2024.07.009

Evangelos Ch. Tsirogiannis , Foivos Psarommatis , Alexandros Prospathopoulos , Georgios Savaidis

{"title":"Composite armor philosophy (CAP): Holistic design methodology of multi-layered composite protection systems for armored vehicles","authors":"Evangelos Ch. Tsirogiannis , Foivos Psarommatis , Alexandros Prospathopoulos , Georgios Savaidis","doi":"10.1016/j.dt.2024.07.009","DOIUrl":"10.1016/j.dt.2024.07.009","url":null,"abstract":"<div><div>A philosophy for the design of novel, lightweight, multi-layered armor, referred to as Composite Armor Philosophy (CAP), which can adapt to the passive protection of light-, medium-, and heavy-armored vehicles, is presented in this study. CAP can serve as a guiding principle to assist designers in comprehending the distinct roles fulfilled by each component. The CAP proposal comprises four functional layers, organized in a suggested hierarchy of materials. Particularly notable is the inclusion of a ceramic-composite principle, representing an advanced and innovative solution in the field of armor design. This paper showcases real-world defense industry applications, offering case studies that demonstrate the effectiveness of this advanced approach. CAP represents a significant milestone in the history of passive protection, marking an evolutionary leap in the field. This philosophical approach provides designers with a powerful toolset with which to enhance the protection capabilities of military vehicles, making them more resilient and better equipped to meet the challenges of modern warfare.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"41 ","pages":"Pages 181-197"},"PeriodicalIF":5.0,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141851970","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