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Protective performance of shear stiffening gel-modified foam against ballistic impact:Experimental and numerical study

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Defence Technology（防务技术） 2024年第2期32卷 510-520页

作者： Huan Tu Haowei Yang Pengzhao Xu Zhe Yang Fan Tang Cheng Dong Yuchao Chen Lei Ren wenjian cao Chenguang Huang Yacong Guo Yanpeng Wei Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Xi'an Institute of Electromechanical Information Technology Xi'an 710065China Science and Technology on Transient Impact Laboratory Beijing 102202China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

As one of the most widely used personal protective equipment(PPE),body armors play an important role in protecting the human body from the high-velocity impact of bullets or *** body torso and critical organs of the wear may suffer severe behind-armor blunt trauma(BABT)even though the impactor is stopped by the body armor.A type of novel composite material through incorporating shear stiffening gel(STG)into ethylene-vinyl acetate(EVA)foam is developed and used as buffer layers to reduce *** this paper,the protective performance of body armors composed of fabric bulletproof layers and a buffer layer made of foam material is investigated both experimentally and *** effectiveness of STG-modified EVA in damage relief is verified by ballistic *** parallel with the experimental study,numerical simulations are conducted by LS-DYNA®to investigate the dynamic response of each component and capture the key mechanical parameters,which are hardly obtained from field *** fully describe the material behavior under the transient impact,the selected constitutive models take the failure and strain rate effect into consideration.A good agreement between the experimental observations and numerical results is achieved to prove the validity of the modelling *** tests and simulations show that the impact-induced deformation on the human body is significantly reduced by using STG-modified EVA as the buffering *** improvement of protective performance is attributed to better dynamic properties and more outstanding energy absorption capability of the composite foam.

关键词： Ballistic behavior Composite foam Shear stiffening gel Finite element analysis Protective mechanism

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Investigation of anode shaping process during co-rotating electrochemical machining of convex structure on inner surface

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Chinese Journal of Aeronautics 2023年第7期36卷 489-504页

作者： Shuofang ZHOU Dengyong WANG wenjian cao Di ZHU College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing 210016China

A novel co-rotating electrochemical machining method is proposed for fabricating convex structures on the inner surface of a revolving *** electrodes motion and material removal method of co-rotating electrochemical machining are different from traditional electrochemical *** equivalent kinematic model is established to analyze the novel electrodes motion,since the anode and cathode rotate in the same direction while the cathode simultaneously feeds along the line of *** to the kinematic equations of the electrodes and Faraday’s law,a material removal model is established to simulate the evolution of the anode profile in co-rotating electrochemical *** simulation results indicate that the machining accuracy of the convex structure is strongly affected by the angular velocity ratio and the radius of the cathode *** increase of the angular velocity ratio can improve the machining accuracy of a convex structure.A small difference in the radius of the cathode tool will cause changes in the shape of the sidewalls of the convex *** width of the cathode window affects only the width of the convex structure and the inclination a of the sidewall.A relation between the width of the cathode window and the width of the convex structure was *** formation process for a convex structure under electrochemical dissolution was *** on the simulation results,the optimal angular velocity ratio and cathode radius were selected for an experimental verification,and 12 convex structures were simultaneously fabricated on the inner surface of a thin-walled revolving *** experimental results are in good agreement with the simulation results,which verifies the correctness of the theoretical ***,inner surface co-rotating electrochemical machining is an effective method for fabricating convex structures on the inner surface of a revolving part.

关键词： Convex structure forming process Co-rotating motion Current density Electrochemical machining Revolving part

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Anodic dissolution mechanism of TA15 titanium alloy during counter-rotating electrochemical machining

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Science China(Technological Sciences) 2022年第6期65卷 1253-1262页

作者： cao wenjian WANG DengYong CUI GuoWei ZHU Di College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing 210016China

Counter-rotating electrochemical machining(CRECM)is a novel shaping method with advantages in processing revolving parts,especially engine ***,few researchers have studied the anodic behaviour of the counter-rotating *** paper aims to analyse the anode dissolution behaviour of TA15 and obtain desired surface qualities in *** anodic characteristics were measured by polarization and cyclic voltammetry curves,and the passive-trans passive behaviour of TA15 was *** electrode surface structures at different stages were analysed using electrochemical impedance spectroscopy(EIS),and a quantitative dissolution model was established to illustrate the electrochemical dissolution and structural evolution of the revolving surfaces.A series of CRECM experiments were conducted,and three stages(pitting corrosion,pitting expansion,and smoothing)were detected according to the current *** the first stage,an oxide film with small pores was formed initially on the metal surface when exposed to *** air-formed oxide film was broken down locally during the electrochemical reaction process,resulting in the occurrence of *** the increase of electricity,the oxide layer became thinner,and the pitting areas expanded and began to connect with each *** this stage,the surface quality was poor owing to the uneven material *** the amount of electricity approximately reached a constant,the oxide layer was completely removed,and a very thin salt film was generated at the metal-electrolyte *** this stage,the material was dissolved uniformly,and the surface was smooth without pitting *** on the obtained results,anode workpieces with grid-like convex structures were fabricated using *** the revolving surface and the sidewalls of the convex structures can be controlled from pitting to smoothness.

关键词： counter-rotating electrochemical machining(CRECM) anode dissolution behaviour current signal quantitative model TA15 titanium alloy

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Evolution of convex structure during counter-rotating electrochemical machining based on kinematic modeling

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Chinese Journal of Aeronautics 2021年第3期34卷 39-49页

作者： wenjian cao Dengyong WANG Zhiyuan REN Di ZHU College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing 210016China

Counter-rotating electrochemical machining(CRECM)is a novel electrochemical machining(ECM)method,which can be used to machine convex structures with complex shapes on the outer surface of *** this study,the evolution of the convex structure during CRECM is *** complex motion form of CRECM is replaced by an equivalent kinematic model,in which the movement of the cathode tool is realized by matrix *** trajectory of the cathode tool center satisfies the Archimedes spiral equation,and the feed depth in adjacent cycles is a *** simulation results show that the variations of five quality indexes for the convex structure:as machining time increases,the height increases linearly,and the width reduces linearly,the fillets at the top and root fit the rational function,and the inclination angle of the convex satisfies the exponential *** current density distributions with different rotation angles is *** to the differential distribution of current density on workpiece surface,the convex is manufactured with the cathode window transferring into and out of the processing *** results agree very well with the simulation,which indicates that the proposed model is effective for prediction the evolution of the convex structure in CRECM.

关键词： Convex structure Counter-rotating electrochemical machining Current density Equivalent kinematic model Material removal

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Protective performance of shear stiff ening gel-modifi ed foam against ballistic impact: Experimental and numerical study

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Defence technology 2024年第2期

作者： Huan Tu Haowei Yang Pengzhao Xu Zhe Yang Fan Tang Cheng Dong Yuchao Chen Lei Ren wenjian cao Chenguang Huang Yacong Guo Yanpeng Wei

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新中国成立以来中国海洋战略变迁的制度逻辑--基于历史制度主义的分析

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中国海洋大学学报（社会科学版） 2022年第6期 1-10页

作者：王琪曹文健中国海洋大学国际事务与公共管理学院山东青岛266100

自新中国成立以来,我国海洋战略主要经历了海洋防御战略、海洋经济发展战略、海洋国际合作战略、海洋强国战略四个阶段的历史变迁。从历史制度主义分析框架来看,我国海洋战略演进主要呈现出渐进的层叠变迁状态,推动海洋战略变迁的制度... 详细信息

自新中国成立以来,我国海洋战略主要经历了海洋防御战略、海洋经济发展战略、海洋国际合作战略、海洋强国战略四个阶段的历史变迁。从历史制度主义分析框架来看,我国海洋战略演进主要呈现出渐进的层叠变迁状态,推动海洋战略变迁的制度动力分为内外部动力,“海洋需求层次”是推动海洋战略变迁的根本内部动力,国际形势变幻、国内经济政治体制改革与国家战略理念更新共同构成推动我国海洋战略变迁的外部动力;同时,海洋战略在高昂的制度退出成本、制度学习效应与协同效应的影响下,路径依赖表现为海洋战略价值导向、变革力量和战略体系自身的稳定性。在未来,我国现行的海洋强国战略应该继续保持与宏观制度环境的匹配度,积极参与全球海洋治理,也要增强海洋强国战略对各类海洋需求的满足度,协调各类用海需求。

关键词：历史制度主义海洋战略制度逻辑海洋强国全球海洋治理

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“十四五”时期我国区域协调与绿色融合发展研究

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企业经济 2021年第3期40卷 142-150页

作者：彭伟斌曹稳键杭州师范大学经济与管理学院浙江杭州311121 杭州师范大学环境健康治理研究所浙江杭州311121 兰州财经大学经济研究所甘肃兰州730000

近年来,我国坚持区域协调和绿色发展理念,区域协调取得一定成果,生态环境持续改善。“十四五”时期也将是我国实现区域协调和绿色发展的攻坚期。区域协调是绿色发展的前提,而绿色发展则是区域协调的高级形态。实现区域协调和绿色发展,... 详细信息

近年来,我国坚持区域协调和绿色发展理念,区域协调取得一定成果,生态环境持续改善。“十四五”时期也将是我国实现区域协调和绿色发展的攻坚期。区域协调是绿色发展的前提,而绿色发展则是区域协调的高级形态。实现区域协调和绿色发展,是我国在新的历史时期实施体制机制创新的需要,实现共同富裕的理论需要,更是可持续发展的现实需要。要顺利实现区域协调和绿色融合发展,需要推动主体功能区发展,推动城市协调发展,实施绿色发展战略。重点是提升核心城市群人才集聚能力,破解经济增长与环境保护的两难困境;把握全球化发展的新历史机遇,实现产业结构优化和经济可持续发展;完善产权制度和生态补偿机制,探索区域协调和绿色融合发展新路径。

关键词：区域协调绿色发展比较优势生态补偿机制

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从IPv4到IPv6的演进技术

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计算机工程 2000年第S1期26卷 829-834页

作者：邵文简曹争东南大学计算机系南京210096

本文首先介绍了ＩＰｖ６演进中的基本问题，如地址结构、域名解析、路由。然后介绍了两类演进工具，双协议栈和隧道技术以及转换工具，并且详细说明了几种具体的实现方法。

关键词： IPv6 DNS 隧道技术双协议栈

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超高效液相色谱法快速测定环境空气中15种酚类化合物的含量

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理化检验（化学分册） 2024年第6期60卷 624-627页

作者：曹燕燕朱晨郭文建解军王梅山东省生态环境监测中心济南250101

酚类化合物被广泛用于染料、医药、防腐剂、杀菌及除草剂、炸药的生产。酚类化合物对生物的生殖、神经等系统均有一定毒性,甚至可致畸、致癌、致突变,且进入环境后很难降解,近年来得到广泛关注。美国环境保护署(EPA)颁布的129项优先控... 详细信息

酚类化合物被广泛用于染料、医药、防腐剂、杀菌及除草剂、炸药的生产。酚类化合物对生物的生殖、神经等系统均有一定毒性,甚至可致畸、致癌、致突变,且进入环境后很难降解,近年来得到广泛关注。美国环境保护署(EPA)颁布的129项优先控制污染物中有11种酚类化合物;我国颁布的68项优先控制污染物中也纳入了6种酚类化合物,分别是苯酚、3-甲基苯酚、2,4-二氯苯酚、2,4,6-三氯苯酚、4-硝基苯酚和五氯苯酚[1]。因此,寻求一种简单、准确度及灵敏度高、可同时快速分析多种酚类化合物的方法显得尤为重要。

关键词：超高效液相色谱法酚类化合物五氯苯酚优先控制污染物环境空气美国环境保护署致突变甲基苯酚

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富氧气氛下碳氢燃料同轴射流扩散火焰的形态特性

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过程工程学报 2017年第3期17卷 632-639页

作者：曹文健任飞相龙凯冯艳楚化强顾明言安徽工业大学能源与环境学院安徽马鞍山243000

采用碳氢燃料燃烧实验台,在不同燃料流量和氧浓度下研究甲烷、乙烯同轴射流扩散火焰的火焰形态和温度变化,利用场发射扫描电镜观测不同位置的碳黑样本.结果表明,氧浓度由21%(φ)升至100%(φ)时,甲烷、乙烯火焰高度下降79%,火焰边缘温度... 详细信息

采用碳氢燃料燃烧实验台,在不同燃料流量和氧浓度下研究甲烷、乙烯同轴射流扩散火焰的火焰形态和温度变化,利用场发射扫描电镜观测不同位置的碳黑样本.结果表明,氧浓度由21%(φ)升至100%(φ)时,甲烷、乙烯火焰高度下降79%,火焰边缘温度比中心温度分别高233.6和337.3℃,乙烯外焰的腰部位置出现"黄金区域".乙烯流量增至170 m L/min、氧浓度增至31%(φ)时,火焰尖端出现"焰翅",而甲烷火焰始终未见"焰翅".在乙烯火焰"黄金区域"大量积聚的碳黑颗粒具有很高的发射率,火焰亮度明显增强.

关键词：同轴射流富氧燃烧火焰形态温度碳黑

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