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Origami-Based Design for 4D Printing of 3D Support-Free hollow Structures

Engineering 2022年第5期8卷 70-82页

作者： Bingcong Jian Frederic Demoly Yicha Zhang h.jerry qi Jean-Claude Andre Samuel Gomes Laboratoire Interdisciplinaire Carnot de Bourgogne UMR 6303 Centre National de la Recherche Scientifique&Universitede Technologie de Belfort-MontbeliardUniversite Bourgogne Franche-ComteBelfort 90400France George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Laboratoire Reactions et Genie des Procedes UMR 7274 Centre National de la Recherche Scientifique-Universitede LorraineNancy 54001France

The integration of additive manufacturing(AM)in design and engineering has prompted a wide spectrum of research efforts,involving topologically optimized solid/lattice structures,multimaterial structures,bioinspired organic structures,and multiscale structures,to name a ***,except for obvious cases,very little attention has been given to the design and printing of more complex three-dimensional(3D)hollow structures or folded/creased *** of the main reasons is that such complex open or closed 3D cavities and regular/freeform folds generally lead to printing difficulties from support-structure-related *** address this barrier,this paper aims to investigate four-dimensional(4D)printing as well as origami-based design as an original research direction to design and build 3D support-free hollow *** work consists of describing the rough 3D hollow structures in terms of two-dimensional(2D)printed origami precursor layouts without any support *** origami-based definitions are then embodied with folding functions that can be actuated and fulfilled by 3D printed smart *** desired 3D shape is then built once an external stimulus is applied to the active materials,therefore ensuring the transformation of the 2D origami layout to 3D *** demonstrate the relevance of the proposal,some illustrative cases are introduced.

关键词： Origami-based design 4D printing Smart material hollow 3D structures Additive manufacturing

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Computational design for 4D printing of topology optimized multi-material active composites

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npj Computational Materials 2023年第1期9卷 2342-2350页

作者： Darshan Athinarayanarao Romaric Prod’hon Dominique Chamoret h.jerry qi Mahdi Bodaghi Jean-Claude André Frédéric Demoly ICB UMR 6303 CNRS Univ.Bourgogne Franche-ComtéUTBM90010 BelfortFrance The George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Department of Engineering School of Science and TechnologyNottingham Trent UniversityNottingham NG118NSUK LRGP UMR 7274 CNRS University of LorraineNancyFrance

Recent efforts on design for four-dimensional(4D)printing have considered the spatial arrangement of smart materials and energy *** development of multifunctional structures and their desired mechanical/actuation performances require tackling 4D printing from a multi-material design *** the materials distributions there is an opportunity to increase the spectrum of design concepts with computational *** main goal being to achieve the“best”distribution of material properties in a voxelized structure,a computational framework that consists of a finite element analysis-based evolutionary algorithm is *** fuses the advantages of optimizing both the materials distribution and material layout within a design space via topology optimization to solve the inverse design problem of finding an optimal design to achieve a target shape change by integrating void *** results demonstrate the efficacy of the proposed method in providing a highly capable tool for the design of 4D-printed active composites.

关键词： composites printing topology

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Anisotropic and asymmetric deformation mechanisms of nanolaminated graphene/Cu composites

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Nano Materials Science 2019年第2期1卷 121-130页

作者： Shayuan Weng huiming Ning Tao Fu Ning hu Shu Wang Kaiyan huang Xianghe Peng h. jerry qi Cheng Yan College of Aerospace Engineering Chongqing University Chongqing 400044 PR China Key Laboratory of Optoelectronic Technology and Systems of the Education Ministry of China Chongqing University Chongqing 400044 PR China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha 410082 PR China The George W. Woodruff School of Mechanical Engineering Renewable Bioproduct Institute Georgia Institute of Technology Atlanta GA 30332 United States School of Chemistry Physics and Mechanical Engineering Science and Engineering Faculty Queensland University of Technology (QUT) 2 George Street G.P.O. Box 2434 Brisbane Australia

We conducted molecular dynamics (MD) simulations of tension and compression along the direction and MD simulations of compression along the and directions on nanolaminated graphene/Cu (NGCu) composites to investigate the effects of the incorporated graphene and the deformation mechanisms related to the loading direction. The deformation behavior and the defect structures were found to be strongly dependent on the loading conditions. An asymmetric tension-compression deformation behavior was thus found in graphene/Cu nanolaminates under the loading, which was dominated by stacking faults and deformation twins formed by dislocation slide under tension and compression, respectively. high density and ordered nanotwins were formed at the graphene/Cu interfaces. Two different formation mechanisms of the twins were found under the compression, and the nucleated twins were easy to be thickened with the assistance of the graphene wrinkles. Multiple twins were formed under the compression by the dislocation cross-slip. This study provides a way to introduce graphene reinforcement and twin boundary to Cu matrix composites and design nanotwinned graphene/Cu composites with excellent mechanical performance.

关键词： Deformation Mechanisms Molecular Dynamics Graphene/Cu Composites Interface Twin

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具有活性交联网络的热固性聚合物粘接行为的分子动力学模拟

具有活性交联网络的热固性聚合物粘接行为的分子动力学模拟

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北京力学会第二十二届学术年会

作者：杨华郭雅芳 h.jerry qi 北京交通大学力学系

具有活性交联网络的热固性聚合物可以通过键交换反应改变聚合物网络构型,从而表现出许多有趣的特性,比如应力释放、自愈合、界面粘接和再回收。键交换反应是指活性原子与特定的原子对发生化学反应,反应后活性原子与原子对中一个原子形... 详细信息

具有活性交联网络的热固性聚合物可以通过键交换反应改变聚合物网络构型,从而表现出许多有趣的特性,比如应力释放、自愈合、界面粘接和再回收。键交换反应是指活性原子与特定的原子对发生化学反应,反应后活性原子与原子对中一个原子形成新的化学键,释放另一个原子,被释放的原子将成为新的活性原子,继续与其他的原子对发生反应。本文通过分子动力学方法探究了由于键交换反应导致的材料界面粘接行为,并比较了粘接过程中材料的力学性能。最后,本文分析了温度对粘接时间的影响,结果表明粘接时间随温度的升高而增加。

关键词：键交换反应界面粘接分子动力学

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Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

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Journal of Energy Chemistry 2025年第1期100卷 385-396页

作者： Mingming Zhang hanyu Wu qi Chen Jiaxin Yang Bonan Liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of Nh3/O2and the production of N2/h2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of Nh3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for Oh and O（1S）.however,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

关键词： Nanosecond pulsed discharge Ammonia Oxidative pyrolysis Fluid model Global model

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Design of active composites for 4D printing

Design of active composites for 4D printing

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中国力学大会-2015

作者： qi h.jerry George W.Woodruff School of Mechanical Engineering Georgia Institute of Technology 西安交通大学航空航天学院

We exploit these advances and introduce a paradigm of active composites by 4D printing where the shape of printed 3D object can change upon external stimuli,thus offering one additional dimension for shape forming and control,the 4-th dimension of 3D *** directly print a compositein its initial 3D configuration from a CAD file that specifies the shape memory

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A robust deformed convolutional neural network(CNN)for image denoising

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CAAI Transactions on Intelligence Technology 2023年第2期8卷 331-342页

作者： qi Zhang Jingyu Xiao Chunwei Tian jerry Chun‐Wei Lin Shichao Zhang School of Economics and Management Harbin Institute of Technology at WeihaiWeihaiChina School of Computer Science Central South UniversityChangshaChina School of Software Northwestern Polytechnical UniversityXi'anShaanxiChina Research&Development Institute Northwestern Polytechnical UniversityShenzhenChina Yangtze River Delta Research Institute Northwestern Polytechnical UniversityTaicangChina Department of Computer Science Electrical Engineering and Mathematical SciencesWestern Norway University of Applied SciencesBergenNorway

Due to strong learning ability,convolutional neural networks(CNNs)have been developed in image ***,convolutional operations may change original distributions of noise in corrupted images,which may increase training difficulty in image *** relations of surrounding pixels can effectively resolve this *** by that,we propose a robust deformed denoising CNN(RDDCNN)in this *** proposed RDDCNN contains three blocks:a deformable block(DB),an enhanced block(EB)and a residual block(RB).The DB can extract more representative noise features via a deformable learnable kernel and stacked convolutional architecture,according to relations of surrounding *** EB can facilitate contextual interaction through a dilated convolution and a novel combination of convolutional layers,batch normalisation(BN)and ReLU,which can enhance the learning ability of the proposed *** address long-term dependency problem,the RB is used to enhance the memory ability of shallow layer on deep layers and construct a clean ***,we implement a blind denoising *** results demonstrate that our denoising model outperforms popular denoising methods in terms of qualitative and quantitative *** can be obtained at https://***/hellloxiaotian/RDDCNN.

关键词： blind denoising CNN deformed block enhanced block

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Staged dendrite suppression for high safe and stable lithium-sulfur batteries

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Journal of Energy Chemistry 2025年第1期100卷 674-683页

作者： Jun Jiang Zhenjie Lu Yanwen Ding Shujun Liu Zhijie qi Tian Tang Yunfan Zhang Zhiyuan Ma Jingwen Sun Liang Xue Wenyao Zhang Pan Xiong Xin Wang Junwu Zhu Yongsheng Fu Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education Nanjing University of Science and Technology Jiangsu Pylon Battery Co.Ltd

The unavoidable dendrite growth and shuttle effect have long been stranglehold challenges limiting the safety and practicality of lithium-sulfur ***,we propose a dual-action strategy to address the lithium dendrite issue in stages by constructing a multifunctional surface-negatively-charged nanodiamond layer with high ductility and robust puncture resistance on polypropylene （PP） *** uniformly loaded compact negative layer can not only significantly enhance electron transmission efficiency and promote uniform lithium deposition,but also reduce the formation of dendrite during early deposition *** importantly,under the strong puncture stress encountered during the deterioration of lithium dendrite growth under limiting current,the high ductility and robust puncture resistance（145.88 MPa） of as-obtained nanodiamond layer can effectively prevent short circuits caused by unavoidable lithium *** Li||Li symmetrical cells assembled with nanodiamond layer modified PP demonstrated a stable cycle of over 1000 h at 2 mA cm-2with a polarization voltage of only 29.3 ***,the negative charged layer serves as a physical barrier blocking lithium polysulfide ions,effectively mitigating capacity *** improved cells achieved a capacity decay of only 0.042%per cycle after 700 cycles at 3 C,demonstrating effective suppression of dendrite growth and capacity attenuation,showing promising prospect.

关键词： Lithium-sulfur batteries Staged dendrite suppression Shuttle effect Surface-negatively-charged nanodiamond

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MOLECULAR DYNAMICS SIMULATION OF STRUCTURE STABILITY OF SILVER NANOCLUSTERS

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Acta Metallurgica Sinica(English Letters) 2006年第3期19卷 209-214页

作者： W.h. qi School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China School of Materials Science and Engineering Central South University Changsha 410083 China

The structures of Ag clusters with sizes n=13 to 1157 are studied by tight binding molecular dynamics simulation. It is found that the stable structures of Ag clusters follow the sequence amorphous-crystalline-amorphous-crystalline with the cluster size increasing from 13 to 1157. Furthermore, all the shells of Ag clusters are different from the structure of the corresponding bulk Ag.

关键词： structure stability molecular dynamics silver nanoclusters

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Fe_(n)Mo_(38-n)(n=0-38)及Fe_(n)Mo_(55-n)(n=0-55)双金属团簇的结构演化和基态能量

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原子与分子物理学报 2025年第3期42卷 85-93页

作者：郑琪琪陈轩程彪段海明新疆大学物理科学与技术学院乌鲁木齐830017

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存... 详细信息

基于半经验的Gupta多体势,采用遗传算法及分子动力学淬火算法,系统研究了(FeMo)m(m=38及55)双金属团簇的基态结构及其能量.结果表明:对于Fe_(n)Mo_(38-n)(n=0-38)团簇,随Fe原子数的增加,Fe原子优先占据团簇表面再占据内部,其基态构型存在类O_(h)结构、类I_(h)结构和无序结构间的竞争.对于Fe_(n)Mo_(55-n)(n=0-55)团簇,随Fe原子数的增加,Fe原子优先占据团簇中心位置,再依次占据表面顶点、棱边和次外层,双金属团簇基态构型主要体现为在Mackay二十面体基础上的结构畸变.Fe_(24)Mo_(14),Fe_(13)Mo_(42)和Fe_(43)Mo_(12)为幻数结构团簇,研究发现双金属团簇幻数成因不能通过单质团簇常用的平均配位数和平均键长模型解释,它更多的归咎于组分效应导致的结构高对称性.

关键词：双金属团簇结构和能量淬火算法遗传算法

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