Defence Technology(防务技术)最新文献

Optimal two-channel switching false data injection attacks against remote state estimation of the unmanned aerial vehicle cyber-physical system 针对无人机网络物理系统远程状态估计的最优双通道切换假数据注入攻击

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.025

Juhong Zheng , Dawei Liu , Jinxing Hua , Xin Ning

{"title":"Optimal two-channel switching false data injection attacks against remote state estimation of the unmanned aerial vehicle cyber-physical system","authors":"Juhong Zheng , Dawei Liu , Jinxing Hua , Xin Ning","doi":"10.1016/j.dt.2024.12.025","DOIUrl":"10.1016/j.dt.2024.12.025","url":null,"abstract":"<div><div>A security issue with multi-sensor unmanned aerial vehicle (UAV) cyber physical systems (CPS) from the viewpoint of a false data injection (FDI) attacker is investigated in this paper. The FDI attacker can employ attacks on feedback and feed-forward channels simultaneously with limited resource. The attacker aims at degrading the UAV CPS's estimation performance to the max while keeping stealthiness characterized by the Kullback-Leibler (K-L) divergence. The attacker is resource limited which can only attack part of sensors, and the attacked sensor as well as specific forms of attack signals at each instant should be considered by the attacker. Also, the sensor selection principle is investigated with respect to time invariant attack covariances. Additionally, the optimal switching attack strategies in regard to time variant attack covariances are modeled as a multi-agent Markov decision process (MDP) with hybrid discrete-continuous action space. Then, the multi-agent MDP is solved by utilizing the deep Multi-agent parameterized Q-networks (MAPQN) method. Ultimately, a quadrotor near hover system is used to validate the effectiveness of the results in the simulation section.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 319-332"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921667","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

Adjoint-based RCS surface sensitivity calculation for very large electrical size object 基于伴随矩阵的RCS表面灵敏度计算

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.11.009

Jun Deng , Zhenghong Gao , Lin Zhou , Ke Zhao , Jiangtao Huang , Wei Zhang

{"title":"Adjoint-based RCS surface sensitivity calculation for very large electrical size object","authors":"Jun Deng , Zhenghong Gao , Lin Zhou , Ke Zhao , Jiangtao Huang , Wei Zhang","doi":"10.1016/j.dt.2024.11.009","DOIUrl":"10.1016/j.dt.2024.11.009","url":null,"abstract":"<div><div>The primary concern in stealth aircraft design is the very large electrical size objects. However, the computational and storage requirements of these objects present significant obstacles for current high-fidelity design methods, particularly when addressing high-dimensional complex engineering design problems. To address these challenges, we developed a surface sensitivity technique based on the multilevel fast multipole algorithm (MLFMA). An access and storage of sparse partial derivative tensor was improved to significantly enhanced the computation performance. The far-field interactions of the surface sensitivity equation were realized by differential the multipole expansion. In addition, we proposed a fast far-field multiplication method to accelerate the multiplication process. The surface mesh derivative with respect to the design variables was calculated by analytical and complex variable methods, substantially improving computational efficiency. These advancements enabled the MLFMA-based surface sensitivity method to millions meshes and large-scale gradients, extending gradient-based optimization for very large electrical size problems. Test cases have verified the effectiveness of this method in optimizing very large electrical objects in terms of both accuracy and efficiency.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 164-179"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921749","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

Simulation and experimental study on the use of shaped charge jet as transient antennas for radiating electromagnetic pulses 聚能射流作为瞬态天线辐射电磁脉冲的仿真与实验研究

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.012

Jiahui Guo , Bin Ma , Zhengxiang Huang , Yong Peng , Xin Jia

{"title":"Simulation and experimental study on the use of shaped charge jet as transient antennas for radiating electromagnetic pulses","authors":"Jiahui Guo , Bin Ma , Zhengxiang Huang , Yong Peng , Xin Jia","doi":"10.1016/j.dt.2024.12.012","DOIUrl":"10.1016/j.dt.2024.12.012","url":null,"abstract":"<div><div>In this study, the potential application of shaped charge jets as transient antennas for electromagnetic signal transmission was explored and an electromagnetic pulse radiation system with a shaped charge jet as a transient antenna was proposed. During the research, crucial characteristics of the transient antenna formed by a shaped charge with a 30 mm diameter, such as resonant frequency, radiation pattern, and radiation efficiency, were evaluated. The typical shaped charge jet morphology was obtained based on the simulations, in which it could insight the dynamic behavior of the shaped charge jet selected. An equivalent model experiment was employed to test the radiation efficiency, and it showed that a shorting pin loading method could increase the relative bandwidth of the jet antenna to 32.8%, and the experimental results correlate with the theoretical predictions for half-wave dipole antennas reasonably well. Additionally, variations in the diameter of the shaped charge jet were found to affect the input impedance and impedance bandwidth, while the length of the jet influenced the resonant frequency of the antenna. This suggests that altering these parameters can achieve reconfigurability of the jet antenna.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 260-274"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921757","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

Study on the formation characteristics of underwater hemispherical shaped charge jet and its penetration performance into concrete 水下半球形聚能射流形成特性及侵彻混凝土性能研究

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.004

Chao Cao , Jinxiang Wang , Lingquan Kong , Kui Tang , Yujie Xiao , Yangchen Gu , Ming Yang , Jian Wang

{"title":"Study on the formation characteristics of underwater hemispherical shaped charge jet and its penetration performance into concrete","authors":"Chao Cao , Jinxiang Wang , Lingquan Kong , Kui Tang , Yujie Xiao , Yangchen Gu , Ming Yang , Jian Wang","doi":"10.1016/j.dt.2024.12.004","DOIUrl":"10.1016/j.dt.2024.12.004","url":null,"abstract":"<div><div>Shaped charge has been widely used for penetrating concrete. However, due to the obvious difference between the propagation of shock waves and explosion products in water and air, the theory governing the formation of shaped charge jets in water as well as the underwater penetration effect of concrete need to be studied. In this paper, we introduced a modified forming theory of an underwater hemispherical shaped charge, and investigated the behavior of jet formation and concrete penetration in both air and water experimentally and numerically. The results show that the modified jet forming theory predicts the jet velocity of the hemispherical liner with an error of less than 10%. The underwater jets exhibit at least 3% faster and 11% longer than those in air. Concrete shows different failure modes after penetration in air and water. The depth of penetration deepens at least 18.75% after underwater penetration, accompanied by deeper crater with 65% smaller radius. Moreover, cracks throughout the entire target are formed, whereas cracks exist only near the penetration hole in air. This comprehensive study provides guidance for optimizing the structure of shaped charge and improves the understanding of the permeability effect of concrete in water.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 180-196"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921748","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

Damage mechanism of gamma-irradiated repurposed pultruded glass fibre polyester composite subjected to low-velocity impact using non-destructive techniques 用非破坏性技术研究伽玛辐照改性拉挤玻璃纤维聚酯复合材料低速冲击的损伤机理

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.002

Muhammad Imran Najeeb , Muhammad Amir Siti Madiha , Agusril Syamsir , Mohd Supian Abu Bakar , Sapizah Rahim , Asyraf Arif Abu Bakar , Tabrej Khan

{"title":"Damage mechanism of gamma-irradiated repurposed pultruded glass fibre polyester composite subjected to low-velocity impact using non-destructive techniques","authors":"Muhammad Imran Najeeb , Muhammad Amir Siti Madiha , Agusril Syamsir , Mohd Supian Abu Bakar , Sapizah Rahim , Asyraf Arif Abu Bakar , Tabrej Khan","doi":"10.1016/j.dt.2025.01.002","DOIUrl":"10.1016/j.dt.2025.01.002","url":null,"abstract":"<div><div>Investigating the influence of radiation on glass fibre composites is essential for their use in space and aerospace environment. Gaining insight into the damage mechanisms caused by gamma irradiation, can improve the safety and resilience of structures. This paper is aimed at investigating the failure mode and damage of gamma-irradiated repurposed pultruded glass fibre-reinforced polyester subjected to low-velocity impact using three types of non-destructive techniques. Three sets of differently layered configurations (CRC, WCRW, W2CR2C) consisting of chopped (c), roving (r), and weaved (w) fibre-reinforced polyester are applied in this study. Drop hammer test is applied to evaluate the low-impact resistance properties of Gamma-irradiated composite at 100 kGy, 500 kGy, and 1000 kGy. Preliminary flexural and hardness tests are conducted to further assess the behaviour of irradiated polymer composites. Further, the damage modes associated with the low-impact test are characterised using infrared thermography, flat panel digital radiography, and microscope observation. The results show that the composites irradiated with various doses display good impact resistance at 20 J, presenting minor damages in the form of dents on the surface. The irradiated CRC and WCRW display best impact resistance at 500 kGy, while W2CR2C at 1000 kGy. This shows that the layering sequence of reinforcement fibre can influence the impact resistance of irradiated composites. Apart from that, the application of non-destructive techniques show different damage mechanisms in the form resin cracks, yarn splitting/fracture, and matrix splitting when the composites are exposed at high and low irradiation doses. These findings offer valuable data for the defence industry, particularly in the areas of repair, maintenance, and the development of new materials.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 139-151"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921751","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

Determining the parameters and chemical behaviour of the overdriven detonation reaction zone of CL-20-based aluminized explosives cl -20基铝化炸药超驱动爆轰反应区参数及化学行为测定

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.001

Moyan Liu , Yan Liu , Fan Bai , Hongfu Wang , Shanyong Chu , Fenglei Huang

{"title":"Determining the parameters and chemical behaviour of the overdriven detonation reaction zone of CL-20-based aluminized explosives","authors":"Moyan Liu , Yan Liu , Fan Bai , Hongfu Wang , Shanyong Chu , Fenglei Huang","doi":"10.1016/j.dt.2025.01.001","DOIUrl":"10.1016/j.dt.2025.01.001","url":null,"abstract":"<div><div>The new CL-20 (hexanitrohexaazaisowurtzitane) type aluminized explosives in the overdrive detonation (ODD) conditions of the core problem is how to accurately represent the state of the overdrive detonation products. To this end, this paper is based on the impedance matching method to test the ODD conditions of CL-20 type aluminium explosive particle velocity. Calculated the interfacial pressure of the shock wave in different media. Determined the characteristic parameters of the reaction zone of the detonation of CL-20 aluminized explosives. Calibrated the parameters of the Jones–Wilkins–Lee (JWL) + γ equation for the detonation products (DPs). Revealed the effect of different DPs equation of state (EOS) on the Hugoniot pressure of ODD. The results indicate that when the content of aluminum powder ranges from 0% to 30%, the duration of the ODD reaction zone and the width of the detonation reaction zone of the CL-20-based aluminized explosive are directly proportional to the content of aluminum powder. The width of the detonation reaction zone is increased by 1.97 times to 2.7 times compared to that of the reaction zone without the addition of aluminum powder. However, the energy release efficiency of the detonation reaction zone is inversely proportional to the content of aluminum powder. When the aluminum powder content was held constant, the incorporation of AP caused a 25% reduction in the energy release efficiency of the detonation reaction zone. Compared with existing ODD state equations, the JWL + γ equation is superior in calibrating overpressure Hugoniot data and the isentropic expansion in the C-J state. The deviation between calculated pressure results and experimental measurements is within 6%.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 46-66"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921744","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 comprehensive comparison of hydro-elastoplastic-damage and cap-elastoplastic-damage material models for concrete subjected to impact and blast loadings 冲击和爆炸荷载作用下混凝土的水弹塑性损伤和帽弹塑性损伤材料模型的综合比较

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.014

Shufeng Shi , Xiangzhen Kong , Junyu Fan , Yong Peng , Qin Fang

{"title":"A comprehensive comparison of hydro-elastoplastic-damage and cap-elastoplastic-damage material models for concrete subjected to impact and blast loadings","authors":"Shufeng Shi , Xiangzhen Kong , Junyu Fan , Yong Peng , Qin Fang","doi":"10.1016/j.dt.2024.12.014","DOIUrl":"10.1016/j.dt.2024.12.014","url":null,"abstract":"<div><div>Concrete material model plays an important role in numerical predictions of its dynamic responses subjected to projectile impact and charge explosion. Current concrete material models could be distinguished into two kinds, i.e., the hydro-elastoplastic-damage model with independent equation of state and the cap-elastoplastic-damage model with continuous cap surface. The essential differences between the two kind models are vital for researchers to choose an appropriate kind of concrete material model for their concerned problems, while existing studies have contradictory conclusions. To resolve this issue, the constitutive theories of the two kinds of models are firstly overviewed. Then, the constitutive theories between the two kinds of models are comprehensively compared and the main similarities and differences are clarified, which are demonstrated by single element numerical examples. Finally, numerical predictions for projectile penetration and charge explosion experiments on concrete targets are compared to further demonstrate the conclusion made by constitutive comparison. It is found that both the two kind models could be used to simulate the dynamic responses of concrete under projectile impact and blast loadings, if the parameter needed in material models are well calibrated, although some discrepancies between them may exist.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 83-104"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921746","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

Performance analysis of fluid-core Whipple shields under hypervelocity impact at different projectile speeds 不同弹丸速度下流芯惠普尔护盾超高速冲击性能分析

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.023

Anand Pai , Marcos Rodriguez-Millan , Selim Gürgen , Adithya Piccholiya , Nishant Mujumdar , Satish Shenoy B

{"title":"Performance analysis of fluid-core Whipple shields under hypervelocity impact at different projectile speeds","authors":"Anand Pai , Marcos Rodriguez-Millan , Selim Gürgen , Adithya Piccholiya , Nishant Mujumdar , Satish Shenoy B","doi":"10.1016/j.dt.2024.12.023","DOIUrl":"10.1016/j.dt.2024.12.023","url":null,"abstract":"<div><div>Whipple shields as sacrificial bumpers, safeguard the satellites against extremely fast, different-sized projectiles traveling through space in the low earth orbit. Typical Whipple shields comprise a front and rear plate, separated by a gap or space. Recent advancements have explored the use of foam, cellular cores, and alternative materials such as ceramics instead of aluminium for the plates. In the current work, the effect of including fluid cores (air/water) sandwiched between the front and rear plates, on the response to hypervelocity impact was explored through a numerical approach. The numerical simulation consisted of hypervelocity impact by a 2 mm diameter, stainless steel projectile, launched at speeds of 3–9 km/s with a normal impact trajectory towards the Whipple shield. The front and rear bumpers, made of AA6061-T6, were each 1 mm thick. A space of 10 mm was taken between the plates (occupied by fluid). The key metrics analyzed were the perforation characteristics, stages of the debris cloud generation and propagation, energy variations (internal, kinetic and plastic work), temperature variations, and the fragmentation summary. From the computational analysis, employing water-core in Whipple shields could prevent the rear bumper perforation till 6 km/s, lower the peak temperatures at the front bumper perforation zones and debris tip, and generate fewer, larger fragments.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 32-45"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921743","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

Launch dynamics modeling and simulation of box-type multiple launch rocket system considering plane clearance contact 考虑平面间隙接触的箱式多管火箭发射动力学建模与仿真

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.016

Jinxin Tang , Guoping Wang , Genyang Wu , Yutian Sun , Lilin Gu , Xiaoting Rui

{"title":"Launch dynamics modeling and simulation of box-type multiple launch rocket system considering plane clearance contact","authors":"Jinxin Tang , Guoping Wang , Genyang Wu , Yutian Sun , Lilin Gu , Xiaoting Rui","doi":"10.1016/j.dt.2024.12.016","DOIUrl":"10.1016/j.dt.2024.12.016","url":null,"abstract":"<div><div>As the performance of the box-type multiple launch rocket system (BMLRS) improves, its mechanical structures, particularly the plane clearance design between the slider on the rocket and the guide inside the launch canister, have grown increasingly complex. However, deficiencies still exist in the current launch modeling theory for BMLRS. In this study, a multi-rigid-flexible-body launch dynamics model coupling the launch platform and rocket was established using the multibody system transfer matrix method and the Newton-Euler formulation. Furthermore, considering the bending of the launch canister, a detection algorithm for slider-guide plane clearance contact was proposed. To quantify the contact force and friction effect between the slider and guide, the contact force model and modified Coulomb model were introduced. Both the modal and launch tests were conducted. Additionally, the modal convergence was verified. By comparing the modal experiments and simulation results, the maximum relative error of the eigenfrequency is 3.29%. thereby verifying the accuracy of the developed BMLRS dynamics model. Furthermore, the launch test validated the proposed plane clearance contact model. Moreover, the study investigated the influence of various model parameters on the dynamic characteristics of BMLRS, including launch canister bending stiffness, slider and guide material, slider-guide clearance, slider length and layout. This analysis of influencing factors provides a foundation for future optimization in BMLRS design.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 105-123"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921747","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

Impact-induced energy release of typical HCP metal/PTFE/W reactive materials: Experimental study and predictive modeling via machine learning 典型HCP金属/聚四氟乙烯/钨反应材料的冲击诱导能量释放：实验研究和机器学习预测模型

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Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.006

Zhenwei Zhang , Weixi Tian , Tianyi Wang , Zhiyuan Liu , Yansong Yang , Chao Ge , Lei Guo , Yuan He , Chuanting Wang , Yong He

{"title":"Impact-induced energy release of typical HCP metal/PTFE/W reactive materials: Experimental study and predictive modeling via machine learning","authors":"Zhenwei Zhang , Weixi Tian , Tianyi Wang , Zhiyuan Liu , Yansong Yang , Chao Ge , Lei Guo , Yuan He , Chuanting Wang , Yong He","doi":"10.1016/j.dt.2025.01.006","DOIUrl":"10.1016/j.dt.2025.01.006","url":null,"abstract":"<div><div>Zirconium, titanium, and other hexagonally close-packed (HCP) metals and their alloys are representative high specific strength, high reaction enthalpy, and high thermal conductivity structural materials. In this study, two typical HCP metals, zirconium, and titanium, were applied to reactive materials (RMs) to prepare Zr/PTFE/W RMs and Ti/PTFE/W RMs, validating the feasibility of HCP metal/PTFE/W RMs. The impact response process of typical HCP metal/PTFE/W RMs under high-velocity dynamic loads was studied using shock equations of state (EOS) based on porous mixtures and chemical reaction kinetics equations. An improved hemispherical quasi-sealed test chamber was employed to measure the energy release characteristic curves of 10 types of Zr/PTFE/W RMs and Ti/PTFE/W RMs under impact velocities ranging from 500 m/s to 1300 m/s. The datasets of the impact-induced energy release characteristics of HCP metal/PTFE/W RMs were established. Additionally, the energy release efficiency of HCP metal/PTFE/W RMs under impact was predicted using the support vector regression (SVR) kernel function model. The datasets of Zr/PTFE/W RMs and Ti/PTFE/W RMs with W contents of 0%, 25%, 50%, and 75% were used as test sets, respectively. The model predictions showed a high degree of agreement with the experimental data, with mean absolute errors (MAE) of 4.8, 6.5, 4.6, and 4.1, respectively.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 124-138"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921665","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