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Mechanistic investigation of highly bendable magnesium alloy sheet fabricated by short-process manufacturing

Journal of Magnesium and Alloys 2024年第10期12卷 4289-4310页

作者： Shiwei Xu Peijie Xiao Xiaofan Wu John Holmes Frédéric Mompiou Zhenyu Xiao Chen Jin Tianjiao Li Kuaishe Wang Zhuoran Zeng College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan UniversityChangsha 410082China Suzhou Research Institute of Hunan University Suzhou 215131China College of Engineering Computing and CyberneticAustralian National UniversityACT 2601Australia CEMES-CNRS Universitéde Toulouse29 rue J.MarvigToulouse 31055France Qinghai Salt Lake Teli Magnesium Co. Ltd.Xining 810000China International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China School of Metallurgical Engineering Xi’an University of Architecture&TechnologyXi’an 710055China College of Materials Science and Engineering Hunan UniversityChangsha 410082China

In this study,a commercial magnesium alloy AZ31(Mg-3Al-1Zn-0.3Mn)sheet through a short manufacturing process was found to be ductile and highly formable in *** possessing a strong basal texture,the short-processed sheet without any annealing can be bent at a small radius,only 0.2 times its thickness in the 90°bending ***,it could withstand direct deformation by repeated *** in-situ microstructural characterization reveals that extension twin bands with strain localization appear in the bending *** subsequent flattening,these twin bands underwent detwinning,reducing local strain concentrations and enabling further bending *** outstanding bend formability originated from the significant-type dislocation loops slipping on the prismatic crystal planes within dynamic-recrystallized *** grains underwent a uniform refinement to several microns in the short manufacturing process and exhibited low residual *** active prismatic dislocation slip within refined grains was due to its much lower relative activation stress to basal slip(CRSSprism/CRSSbasal of only∼1.6)owing to the effective grain boundary ***,the prismatic dislocation activity was further enhanced when bypassing Al-Mn nano-particles during motion,leaving debris and loops that facilitated easy multiplication.

关键词： Magnesium Deformation Texture In-situ characterization Dislocation slip.

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Multi-scale design and optimization for solid-lattice hybrid structures and their application to aerospace vehicle components

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Chinese Journal of Aeronautics 2021年第5期34卷 386-398页

作者： Chuang WANG Jihong ZHU Manqiao WU Jie HOU Han ZHOU Lu MENG Chenyang LI Weihong ZHANG State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi'an 710072China MIIT Lab of Metal Additive Manufacturing and Innovative Design Northwestern Polytechnical UniversityXi'an 710072China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China

By integrating topology optimization and lattice-based optimization,a novel multi-scale design method is proposed to create solid-lattice hybrid structures and thus to improve the mechanical performance as well as reduce the structural *** achieve this purpose,a two-step procedure is developed to design and optimize the innovative ***,the classical topology optimization is utilized to find the optimal material layout and primary load carrying ***,the solid-lattice hybrid structures are reconstructed using the finite element mesh based modeling *** lattice-based optimization is performed to obtain the optimal crosssection area of the lattice ***,two typical aerospace structures are optimized to demonstrate the effectiveness of the proposed optimization *** numerical results are quite encouraging since the solid-lattice hybrid structures obtained by the presented approach show remarkably improved performance when compared with traditional designs.

关键词： Aerospace vehicle components Lattice-based optimization Multi-scale Solid-lattice hybrid structure Topology optimization

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Analytical Formulation for the Quantum Radar Scattering of the semi-Cylinder Surface

Analytical Formulation for the Quantum Radar Scattering of t...

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2022 International Applied Computational Electromagnetics Society Symposium, ACES-China 2022

作者： Fang, Chonghua Shi, Xinyang Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design Centre Wuhan China Wuhan Maritime Communication Research Institute Wuhan China

ISBN: (纸本)9781665452366

In this paper, the photon backscattering of quantum radar from the semi-cylinder surface is considered. A uniform and analytical solution derived from an asymptotic evaluation of the high-frequency approximation is shown. So, for a typical monostatic scene, you can analytically calculate the QRCS for different elevation angles. Finally, we also analyzed the scattering mechanism difference of the analytical formulations between QRCS and CRCS the semi-cylinder surface. © 2022 IEEE.

关键词： Radar cross section

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A new class of crystalline X-ray induced photochromic materials assembled from anion-directed folding of a flexible cation

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Chinese Chemical Letters 2024年第8期35卷 554-557页

作者： Hong-Jin Liao Zhu Zhuo Qing Li Yoshihito Shiota Jonathan P.Hill Katsuhiko Ariga Zi-Xiu Lu Lu-Yao Liu Zi-Ang Nan Wei Wang You-Gui Huang CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen 361021China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 819-0395Japan World Premier International(WPI)Center for Materials Nanoarchitectonics(MANA) National Institute for Materials Science(NIMS)Ibaraki 305-0044Japan

Electron-deficient viologens are widely used as ligands or structure-directing agents(SDAs)to synthesize crystalline X-ray induced photochromic ***,a new rational strategy of anion-directed fold-ing a flexible cation(H_(2)imb)^(2+)((H_(2)imb)^(2+)=di-protonated 2,3-bis(imidazolin-2-yl)-2,3-dimethylbutane)has been ***-donating Cl−and(ZnCl4)2−are used to direct folding a flexible electron-deficient(H_(2)imb)^(2+)*** complexes(H_(2)imb)(NO_(3))2(1),(H_(2)imb)Cl2·H_(2)O(2),and(H_(2)imb)ZnCl4(3)have been synthesized in which(H_(2)imb)^(2+)crystallize in an anti-conformation,88.8°-gauche,and 51.8°-gauche,*** contrary to X-ray silent complex 1,X-ray induced photochromism has been achieved in both complex 2 and *** intermolecular charge-transfer mechanism has been elucidated and the anion directed folding of(H_(2)imb)^(2+)has been validated to be critical to yield colored long-lived charge-separated states.

关键词： Supramolecular Photochromic X-ray induced Anion-directed folding Electron-deficient viologens

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Research on pipe crack detection based on image processing algorithm

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International Journal of Wireless and Mobile Computing 2021年第4期20卷 328-335页

作者： Huang, Licheng Tao, Bo Chen, Donghai Zhang, Xun Li, Gongfa Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Hubei Wuhan China Key Laboratory of Metallurgical Equipment and Control Technology Ministry of Education Wuhan University of Science and Technology Hubei Wuhan China Changjiang Survey Planning Design and Research Limited Company Hubei Wuhan China

Pipe cracks detection based on machine vision is a new and effective technology. However, it requires high quality of the image. Moreover, images with adequate lighting, evident cracks, clean backgrounds are difficult to obtain in practice. This paper proposes an algorithm for pipe cracks detection in natural background. The algorithm performs filtering, background segmentation, edge detection, threshold segmentation, morphological contour extraction and annotation on the image. This paper also proposes an adaptive threshold segmentation method to obtain the clear crack. By comparing the proposed algorithm with the DEE algorithm, the result shows that the proposed algorithm has certain advantages in experiments. The experiment results show that the algorithm proposed can be used in significant pipe cracks detection. Copyright © 2021 Inderscience Enterprises Ltd.

关键词： Image segmentation

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Bioactive fibrous scaffolds with programmable release of polypeptides regulate inflammation and extracellular matrix remodeling

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Regenerative Biomaterials 2023年第1期10卷 522-532页

作者： Zehong Xiang Xinghua Guan Zhifang Ma Qiang Shi Mikhail Panteleev Fazly I.Ataullakhanov State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchunJilin 130022China University of Science and Technology of China HefeiAnhui 230026China Key Laboratory of Polymeric Materials Design and Synthesis for Biomedical Function Soochow UniversitySuzhou 215123China Dmitry Rogachev National Research Center of Pediatric Hematology Oncology and ImmunologyMoscow 117198Russia Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Russia

Inflammation manipulation and extracellular matrix(ECM)remodeling for healthy tissue regeneration are critical requirements for tissue engineering *** this end,the bioactive polycaprolactone(PCL)-based scaffolds are fabricated to release aprotinin and thymosinβ4(Tβ4)in a programmable *** core part of the fiber is composed of hyaluronic acid and Tβ4,and the shell is PCL,which is further coated with heparin/gelatin/aprotinin to enhance *** in vitro assay demonstrates that the controlled release of aprotinin prevents initial excessive *** subsequent release of Tβ4 after 3 days induces the transition of macrophages from M1 into M2 *** manipulation of inflammatory response further controls the expression of transforming growth factor-βand fibroblast activation,which oversee the quantity and quality of ECM *** addition,the gradual degradation of the scaffold allows cells to proliferate within the *** vivo implant evaluation convinces that PCL-based scaffolds possess the high capability to control the inflammatory response and restore the ECM to normal ***,our work paves a new way to develop tissue engineering scaffolds for inflammation manipulation and ECM remodeling with peptide-mediated reactions.

关键词： bioactive scaffolds inflammation control extracellular matrix remodeling polypeptide release electrospinning

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A Bionic Flexible-bodied Underwater Glider with Neutral Buoyancy

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Journal of Bionic Engineering 2021年第5期18卷 1073-1085页

作者： Yaqiang Zhu Yuhong Liu Shuxin Wang Lianhong Zhang Yanhui Wang Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education School of Mechanical EngineeringTianjin UniversityTianjin 300350China The Joint Laboratory of Ocean Observing and Detection Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

The buoyancy of traditional Underwater Glider(UG)with a rigid hull is aff ected by the changing marine parameters,making it difficult for the vehicle to dive deeper with good motion *** the present work,the development of a novel UG for neutral buoyancy,which is equipped with a Flexible-Liquid-Rigid(FLR)composite hull,is *** innovative hull that imitates the buoyancy regulation mechanism of marine organisms is easily adaptable to the changing marine *** rigid part of the composite hull withstands hydrostatic pressure for inner function modules of the *** liquid of the composite hull mainly serves as a buoyancy compensation to mitigate the eff ect of buoyancy variation caused by the changing marine *** flexible covering provides a good hydrodynamic shape for the vehicle under the internal liquid *** buoyancy variation due to the composite hull compression as well as changes of seawater density and temperature was comprehensively considered in the design process and integrated to the dynamic *** addition,sea trials were performed to verify the motion characteristics of the proposed *** results reveal that the Flexible-bodied Underwater Glider(FUG)has a better gliding performance in practice.

关键词： Bio-inspired buoyancy regulation Flexible-bodied vehicle Composite hull Adaptable buoyancy compensation

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Highly Dispersive Co@N-C Catalyst as Freestanding Bifunctional Cathode for Flexible and Rechargeable Zinc–air Batteries

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Energy & Environmental Materials 2022年第2期5卷 543-554页

作者： Yu Ma Ding Chen Weijun Li Yapeng Zheng Lin Wang Gang Shao Qiao Liu Weiyou Yang College of Materials Science and Engineering Hunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Institute of Materials Ningbo University of TechnologyNingbo 315211China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

The design of efficient cathode with great cycle performance,high flexibility,and low cost is essential for the commercialization of zinc–air battery(ZAB).Herein,we report the exploration of freestanding bifunctional cathode with rationally designed structures,namely,tiny Co nanoparticles embedded in Ndoped carbon nanofiber aerogels,which have desired features including uniform Co dispersity,balanced distribution of N-C species,hierarchically porous structure with increased fraction of meso-to micropores,and moderate amounts of ***,the as-fabricated cathodes exhibit positive half-wave potential of 0.82 V for oxygen reduction and small overpotential of 350 mV at 10 mA cm^(−2) for oxygen evolution,respectively,which deliver smaller reversible oxygen electrode index(0.76 V)than the commercial Pt/C+RuO_(2)(0.80 V)and most Co-based electrocatalysts ever ***,the as-constructed liquid rechargeable ZAB behaves high peak power density(160 mW cm^(−2)),large specific capacity(759.7 mAh g^(−1) at 10 mA cm^(−2),tested after 120 h of OCV tests),and robust stability over 277 ***,the as-assembled quasi-solid-state ZAB using such freestanding cathode represents excellent mechanical flexibility and outstanding cycle performance,regardless of being serviced under extremely bending conditions from 0°to 180°,underscoring their promising applications as durable bifunctional cathode for portable metalair batteries.

关键词： bifunctional cathode carbon nanofiber aerogels Co nanoparticles freestanding cathode zinc-air batteries

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design of Intentional Eye-blink Signal Acquisition and Control System Based on Pressure Sensor 7

Design of Intentional Eye-blink Signal Acquisition and Contr...

引用

7th International Conference on Intelligent Computing and Signal Processing, ICSP 2022

作者： Shao, Xueqi Ning, Haonan Yang, Wenjun Niu, Yafeng Southeast University School of Mechanical Engineering Department of Industrial Design Nanjing China National Key Laboratory of Science and Technology on Aircraft Control Xi'an China

ISBN: (纸本)9781665478571

Eye-blink control means that users blink intentionally to realize human-computer interaction. An intentional eye-blink signal acquisition and control system based on flexible pressure sensor is designed, which aims to control the object through simple eye movements such as blinking and winking. The system uses two pressure sensors to collect the blink signals at the orbicularis oculi muscles of the left and right eyes respectively. The software part realizes the acquisition and recognition of six intentional eye-blink signals, and transmits blink-control instruction signals through Bluetooth, so as to realize the control of the remote-controlled vehicle. The advantage of this system is that it is not affected by illumination and does not need GUI interface for control. The availability of the system is qualified after system test. © 2022 IEEE.

关键词： Human computer interaction

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Characterization of Anisotropy in Additively Manufactured Materials through Instrumented Indentation Testing

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Chinese Journal of Mechanical Engineering 2025年第1期38卷 1-16页

作者： Zhuoshao Cai Zhiwei Yang Liang Meng Kaijie Lin Yuliang Hou Thaneshan Sapanathan Jihong Zhu Weihong Zhang State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical UniversityXi’an 710072China State-Owned Sida Machinery Manufacturing Company Xianyang 712203China Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components College of MaterialsScience and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechanical and Power Engineering Zhengzhou UniversityZhengzhou 450001China Curtin Corrosion Centre WA School of Mines-MineralsEnergy and Chemical EngineeringFaculty of Science and EngineeringCurtin UniversityPerthAustralia

The accurate characterization of anisotropy for additively manufactured materials is of vital importance for both highperformance structural design and printing processing *** avoid the repetitive and redundant tensile testing on specimens prepared along diverse directions,this study proposes an instrumented indentation-based inverse identification method for the efficient characterization of additively manufactured *** the present work,a 3D finite element model of indentation test is first established for the printed material,for which an anisotropic material constitutive model is *** have demonstrated that the indentation responses are information-rich,and material anisotropy along different directions can be interpreted by a single indentation ***,an inverse identification framework is built,in which an Euclidean error norm between simulated and experimental indentation responses is minimized via optimization algorithms such as the Globally Convergent Method of Moving Asymptotes(GCMMA).The developed method has been verified on diverse printed materials referring to either the indentation curve or the residual imprint,and the superiority of this latter over the former is confirmed by a better and faster convergence of inverse *** validations on 3D printed materials(including stainless steel 316L,aluminum alloy AlSi10Mg,and titanium alloy TC4)reveal that the developed method is both accurate and reliable when compared with material constitutive behaviors obtained from uni-axial tensile tests,regardless of the degree of anisotropy among different materials.

关键词： Additive manufacturing Anisotropy property Inverse identification Indentation test

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