Defence Technology(防务技术)最新文献_第2页

Sustainable large-format additive manufacturing of composite molds with 45-degree deposition strategies 45度沉积策略复合材料模具的可持续大尺寸增材制造

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.014

Pablo Castelló-Pedrero , Javier Bas-Bolufer , César García-Gascón , Juan Antonio García-Manrique , Francisco Chinesta

{"title":"Sustainable large-format additive manufacturing of composite molds with 45-degree deposition strategies","authors":"Pablo Castelló-Pedrero , Javier Bas-Bolufer , César García-Gascón , Juan Antonio García-Manrique , Francisco Chinesta","doi":"10.1016/j.dt.2025.05.014","DOIUrl":"10.1016/j.dt.2025.05.014","url":null,"abstract":"<div><div>Military missions in hostile environments are often costly and unpredictable, with squadrons sometimes facing isolation and resource scarcity. In such scenarios, critical components in vehicles, drones, and energy generators may require structural reinforcement or repair due to damage. This paper proposes a portable, on-site production method for molds under challenging conditions, where material supply is limited. The method utilizes large format additive manufacturing (LFAM) with recycled composite materials, sourced from end-of-life components and waste, as feedstock. The study investigates the microstructural effects of recycling through shredding techniques, using microscopic imaging. Three potential defense-sector applications are explored, specifically in the aerospace, automotive, and energy industries. Additionally, the influence of key printing parameters, particularly non-parallel plane deposition at a 45-degree angle, on the mechanical behavior of ABS reinforced with 20% glass fiber (GF) is examined. The results demonstrate the feasibility of this manufacturing approach, highlighting reductions in waste material and production times compared to traditional methods. Shorter layer times were found to reduce thermal gradients between layers, thereby improving layer adhesion. While 45-degree deposition enhanced Young's modulus, it slightly reduced interlayer adhesion quality. Furthermore, recycling-induced fiber length reduction led to material degradation, aligning with findings from previous studies. Challenges encountered during implementation included weak part adherence to the print bed and local excess material deposition. Overall, the proposed methodology offers a cost-effective alternative to traditional CNC machining for mold production, demonstrating its potential for on-demand manufacturing in resource-constrained environments.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 303-317"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145098562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Failure modes and transformation laws of reinforced concrete slabs under drop hammer impact 落锤作用下钢筋混凝土板的破坏模式及变形规律

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.010

Chunming Song , Jiahe Zhong , Haotian Zhang , Yuetang Zhao , Zhongwei Zhang , Feng Liu

{"title":"Failure modes and transformation laws of reinforced concrete slabs under drop hammer impact","authors":"Chunming Song , Jiahe Zhong , Haotian Zhang , Yuetang Zhao , Zhongwei Zhang , Feng Liu","doi":"10.1016/j.dt.2025.05.010","DOIUrl":"10.1016/j.dt.2025.05.010","url":null,"abstract":"<div><div>With the change of the main influencing factors such as structural configuration and impact conditions, reinforced concrete slabs exhibit different mechanical behaviors with different failure patterns, and the failure modes are transformed. In order to reveal the failure mode and transformation rule of reinforced concrete slabs under impact loads, a dynamic impact response test was carried out using a drop hammer test device. The dynamic data pertaining to the impact force, support reaction force, structural displacement, and reinforcement strain were obtained through the use of digital image correlation technology (DIC), impact force measurement, and strain measurement. The analysis of the ultimate damage state of the reinforced concrete slab identified four distinct types of impact failure modes: local failure by stamping, overall failure by stamping, local-overall coupling failure, and local failure by punching. Additionally, the influence laws of hammerhead shape, hammer height, and reinforcement ratio on the dynamic response and failure mode transformation of the slab were revealed. The results indicate that: (1) The local damage to the slab by the plane hammer is readily apparent, while the overall damage by the spherical hammer is more pronounced. (2) In comparison to the high reinforcement ratio slabs, the overall bending resistance of the low reinforcement ratio slabs is significantly inferior, and the slab back exhibits further cracks. (3) As the hammer height increases, the slab failure mode undergoes a transformation, shifting from local failure by stamping and overall failure by stamping to local-overall coupling failure and local failure by punching. (4) Three failure mode thresholds have been established, and by comparing the peak impact force with the failure thresholds, the failure mode of the slab can be effectively determined.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 318-339"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145098563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and experimental validation of the dynamic constitutive model and equation of state for Mo-10Cu alloy Mo-10Cu合金动态本构模型和状态方程的建立与实验验证

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.018

Bihui Hong, Wenbin Li, Yiming Li, Weihang Li, Peng Chen, Yalong Wang

{"title":"Development and experimental validation of the dynamic constitutive model and equation of state for Mo-10Cu alloy","authors":"Bihui Hong, Wenbin Li, Yiming Li, Weihang Li, Peng Chen, Yalong Wang","doi":"10.1016/j.dt.2025.05.018","DOIUrl":"10.1016/j.dt.2025.05.018","url":null,"abstract":"<div><div>This study systematically investigates the mechanical response characteristics of Mo-10Cu pseudo-alloy under various conditions, including temperatures ranging from 298 K to 550 K, strain rates from 1 × 10<sup>−2</sup> s<sup>−1</sup> to 5.2 × 10<sup>3</sup> s<sup>−1</sup>, and dynamic impact loads from 134 m/s to 837 m/s. The investigation is conducted using a combination of multi-method crossover experiment and numerical simulations, with accuracy validated through X-ray testing and static penetration test. Using a universal testing machine, Split-Hopkinson Pressure Bar (SHPB) system, and a light-gas gun, the dynamic constitutive behavior and shock adiabatic curves of the alloy under complex loading conditions are revealed. Experimental results demonstrate that the flow stress evolution of Mo-10Cu alloy exhibits significant strain hardening, and strain-rate strengthening. Based on these observations, a Johnson-Cook (J-C) constitutive model has been developed to describe the material's dynamic behavior. Through free-surface particle velocity measurements, the shock adiabatic relationship was obtained, and a Gruneisen equation of state was established. X-ray experimental results confirm that the Mo-10Cu liner can generate well-formed, cohesive jets. The penetration test results show that the maximum penetration depth can reach 243.10 mm. The maximum error between the numerical simulation and the X-ray test is less than 7.70%, and the error with the penetration test is 4.73%, which confirms the accuracy of the constitutive parameters and the state equation. In conclusion, the proposed J-C model and Gruneisen equation effectively predict the dynamic response and jet formation characteristics of Mo-10Cu alloy under extreme loads. This work provides both theoretical support and experimental data for material design and performance optimization in shaped charge applications.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 145-158"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Purification of amorphous boron powder through the removal of impurity magnesium and its physicochemical properties 通过去除杂质镁提纯无定形硼粉及其理化性质

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.004

Shuxuan Lv , Zhen Cao , Jijun Wu

{"title":"Purification of amorphous boron powder through the removal of impurity magnesium and its physicochemical properties","authors":"Shuxuan Lv , Zhen Cao , Jijun Wu","doi":"10.1016/j.dt.2025.05.004","DOIUrl":"10.1016/j.dt.2025.05.004","url":null,"abstract":"<div><div>At present, the most common preparation method of amorphous boron powder is magnesium thermal reduction method, but the amorphous boron powder obtained by this method mostly contains impurities such as magnesium and oxygen which are difficult to remove, and these impurities will seriously affect the application of amorphous boron powder and need to be strictly removed. In this research, the acid-insoluble impurities were modified through sintering and quenching, while the magnesium impurities were optimized via ultrasonic acid leaching. We observed that the quenching temperature played a crucial role in determining the efficiency of magnesium impurity removal. The results show that the magnesium content in amorphous boron powder can be reduced from 5.67% to 2.40% by quenching the amorphous boron powder at 800 °C and using ultrasonic assisted acid leaching. Furthermore, the oxidation reaction of boron is influenced by the powder's particle size and specific surface area, with the effective activation energy being intimately tied to both these factors. Post-quenching and acid leaching, we observed an increase in the specific surface area of the boron powder samples, leading to enhanced activity. In conclusion, our study presents an effective strategy to mitigate magnesium impurities and elevate the performance of amorphous boron powder, offering promising avenues for advancing its utilization across diverse industries.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 40-50"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing bonding reliability of solid propellant grain based on FFTA and PSO-GRNN 基于FFTA和PSO-GRNN的固体推进剂颗粒键合可靠性提高

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.007

Han Lu , Bin Zhang , Wei Xu , Zhigang Xu , Xinlin Bai , Zheng Hu

{"title":"Enhancing bonding reliability of solid propellant grain based on FFTA and PSO-GRNN","authors":"Han Lu , Bin Zhang , Wei Xu , Zhigang Xu , Xinlin Bai , Zheng Hu","doi":"10.1016/j.dt.2025.05.007","DOIUrl":"10.1016/j.dt.2025.05.007","url":null,"abstract":"<div><div>Bonding quality at the interface of solid propellant grains is crucial for the reliability and safety of solid rocket motors. Although bonding reliability is influenced by numerous factors, the lack of quantitative characterization of interface debonding mechanisms and the challenge of identifying key factors have made precise control of process variables difficult, resulting in unpredictable failure risks. This paper presents an improved fuzzy failure probability evaluation method that combines fuzzy fault tree analysis with expert knowledge, transforming process data into fuzzy failure probability to accurately assess debonding probabilities. The predictive model is constructed through a general regression neural network and optimized using the particle swarm optimization algorithm. Sensitivity analysis is conducted to identify key decision variables, including normal force, grain rotation speed, and adhesive weight, which are verified experimentally. Compared with classical models, the maximum error margin of the constructed reliability prediction model is only 0.02%, and it has high stability. The experimental results indicate that the main factors affecting debonding are processing roughness and coating uniformity. Controlling the key decision variable as the median resulted in a maximum increase of 200.7% in bonding strength. The feasibility of the improved method has been verified, confirming that identifying key decision variables has the ability to improve bonding reliability. The proposed method simplifies the evaluation of propellant interface bonding reliability under complex conditions by quantifying the relationship between process parameters and failure risk, enabling targeted management of key decision variables.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 184-200"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145098554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fault-tolerant control strategies for tilt-rotor aerial-aquatic vehicles: Design and implementation 倾转旋翼水上飞行器容错控制策略的设计与实现

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.01.016

Sihuan Wu , Sifan Wu , Maosen Shao , Zhilin He , Yuan Liu , Jinxiu Zhang

引用次数: 0

A new dimensionless number for dynamic plastic deformation analysis of clamped circular plates subjected to underwater blast loading 一种新的无量纲数用于夹紧圆形板在水下爆炸荷载作用下的动态塑性变形分析

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.05.008

Weizheng Xu, Yu Huang, Tong Li, Hao Tang, Yexun Li, Hua Fu, Xianxu Zheng

引用次数: 0

A review on collisions between drones and aerostructures – Experimental studies, numerical simulation, and regulation 无人机与航空结构碰撞研究综述——实验研究、数值模拟与控制

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.04.011

Michael May , Tim Strohbach

{"title":"A review on collisions between drones and aerostructures – Experimental studies, numerical simulation, and regulation","authors":"Michael May , Tim Strohbach","doi":"10.1016/j.dt.2025.04.011","DOIUrl":"10.1016/j.dt.2025.04.011","url":null,"abstract":"<div><div>The increasing presence of drones seen on the battlefields in modern conflicts poses new threats to manned military aircraft or rotorcraft. In order to assess this potential threat, this manuscript first summarizes all confirmed and suspected collisions between drones and aerostructures and the damage resulting from these collisions. Furthermore, this manuscript reviews experimental and numerical investigations on collision of drones with aerostructures. Additionally, some light is shed onto current regulation for drone operations intended to avoid collisions between drones and aircraft. Whilst these regulatory measures can prevent commercial aircraft to collide with drones, the authors believe that there is an inherent threat for civil and military rotorcraft due to their structural design and the fact that it is not possible to completely separate the airspace between drone operations and rotorcraft operations, in particular in the context of rescue missions in an urban or hostile environment. Furthermore, the stealth capability of 5th generation fighters may be compromised by damage suffered from collision with drones.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 1-29"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The combustion reactivity of core-shell Al/Fluoropolymers and application in RDX-based explosives 核壳铝/氟聚合物的燃烧反应性及其在rdx基炸药中的应用

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.04.016

Ting Liu , Jian Wang , Jie Chen , Cui Nie , Yaofeng Mao , Fude Nie , Ruolei Zhong , Wei Cao , Jun Wang

{"title":"The combustion reactivity of core-shell Al/Fluoropolymers and application in RDX-based explosives","authors":"Ting Liu , Jian Wang , Jie Chen , Cui Nie , Yaofeng Mao , Fude Nie , Ruolei Zhong , Wei Cao , Jun Wang","doi":"10.1016/j.dt.2025.04.016","DOIUrl":"10.1016/j.dt.2025.04.016","url":null,"abstract":"<div><div>Aluminum (Al) powder is widely applied in thermobaric explosives due to its high energy density and favorable reaction kinetics. However, the inert oxide layer (Al<sub>2</sub>O<sub>3</sub>) on Al particles limits combustion reactivity and energy efficiency. Fluoride-based surface modification has been developed as an effective approach to address this issue. Here, four classical fluoropolymers (F11, F14, PVDF, PTFE) are employed as coatings to prepare core-shell Al/Fluoropolymer. The combustion experimental results demonstrate that the core-shell Al/PTFE exhibits the highest flame propagation rate (52.88 mm·ms<sup>−1</sup>) and pressure output (109.02 kPa) performance. Consequently, core-shell Al/PTFE is selected as a high-energy fuel to prepare RDX/Al/PTFE microspheres via the emulsion and solvent evaporation method, which can enhance the energy performance of RDX. The effects of the core-shell Al/PTFE ratio and RDX content on the combustion heat and pressure output are systematically investigated. The peak pressure reaches a maximum of 187.8 kPa when the mass ratio of RDX, Al, and PTFE is 60: 25: 10. Additionally, RDX/Al/PTFE microspheres exhibit significantly higher laser-induced air shock velocities, detonation heat, and detonation pressure than those of pure RDX and RDX/Al. The mechanism underlying the enhanced reactivity and energetic performance is attributed to the ability of PTFE to etch the inert Al<sub>2</sub>O<sub>3</sub> shell on the surface of Al particles, thereby improving post-combustion reactions and significantly increasing the overall energy output of RDX explosives. This work offers a novel design strategy for high-energy structural thermobaric explosives for the practical applications.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 30-39"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A multi-parametric path planning framework utilizing airspace visibility graphs for urban battlefield environments 基于空域可见度图的城市战场多参数路径规划框架

IF 5.9

Defence Technology(防务技术) Pub Date : 2025-09-01 DOI: 10.1016/j.dt.2025.03.011

Sidao Chen , Xuejun Zhang , Zuyao Zhang , Jianxiang Ma

{"title":"A multi-parametric path planning framework utilizing airspace visibility graphs for urban battlefield environments","authors":"Sidao Chen , Xuejun Zhang , Zuyao Zhang , Jianxiang Ma","doi":"10.1016/j.dt.2025.03.011","DOIUrl":"10.1016/j.dt.2025.03.011","url":null,"abstract":"<div><div>Urban combat environments pose complex and variable challenges for UAV path planning due to multidimensional factors, such as static and dynamic obstructions as well as risks of exposure to enemy detection, which threaten flight safety and mission success. Traditional path planning methods typically depend solely on the distribution of static obstacles to generate collision-free paths, without accounting for constraints imposed by enemy detection and strike capabilities. Such a simplified approach can yield safety-compromising routes in highly complex urban airspace. To address these limitations, this study proposes a multi-parameter path planning method based on reachable airspace visibility graphs, which integrates UAV performance constraints, environmental limitations, and exposure risks. An innovative heuristic algorithm is developed to balance operational safety and efficiency by both exposure risks and path length. In the case study set in a typical mixed-use urban area, analysis of airspace visibility graphs reveals significant variations in exposure risk at different regions and altitudes due to building encroachments. Path optimization results indicate that the method can effectively generate covert and efficient flight paths by dynamically adjusting the exposure index, which represents the likelihood of enemy detection, and the path length, which corresponds to mission execution time.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 112-126"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0