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Wrinkling modes of graphene oxide assembled on curved surfaces

Nano Research 2023年第2期16卷 1801-1809页

作者： Kaiwen Li Zhanpo Han Lidan Wang Jiaqing Wang Chuanwei Zhang Jiahao Lin Shiyu Luo Li Peng Wenzhang Fang Yingjun Liu Ziliang Wu Yeqiang Tan Chao Gao Zhen Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China State Key Laboratory of Bio-Fibers and Eco-Textiles Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile TechnologySchool of Materials Science and EngineeringQingdao UniversityQingdao 266071China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000China

Assembling two-dimensional(2D)sheets into macroscopic three-dimensional(3D)forms has created a promising material family with rich *** wrinkles are intrinsic features of 2D sheets in their 3D ***,the precise wrinkling modulation optimizes the transition of outstanding properties of 2D sheets to expected performances of assembled materials and dominates their fabrication *** wrinkling evolution of 2D sheets assembling onto flat surfaces has been extensively understood,however,the wrinkling behaviors on the more generally curved surface still remain ***,we investigate the wrinkling behaviors of graphene oxide sheets assembled onto curved surfaces and reveal the selection rule of wrinkling modes that determined by the curvature mismatch between 2D sheets and target *** uncover that three wrinkling modes including isotropic cracked land,labyrinth,and anisotropic curtain phases,respectively emerge on flat,spherical,and cylindrical surfaces.A favorable description paradigm is offered to quantitatively measure the complex wrinkling patterns and assess the curvature mismatch constraint underlying the wrinkling mode *** research provides a general and quantitative description framework of wrinkling modulation of 2D materials such as high performance graphene fibers,and guides the precise fabrication of particles and functional coatings.

关键词： two-dimensional(2D)sheets three-dimensional(3D)assembles curved surfaces wrinkling modes selection curvature mismatch constraint wrinkling modulation

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TFM imaging of aeroengine casing ring forgings with curved surfaces using acoustic field threshold segmentation and vector coherence factor

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Chinese Journal of Aeronautics 2022年第11期35卷 401-415页

作者： Shanyue GUAN Xiaokai WANG Lin HUA Yixuan LI Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China School of Automotive Engineering Wuhan University of TechnologyWuhan 430070China

The aeroengine casing ring forgings have complex cross-section shapes,when the conventional ultrasonic or phased array is applied to detect such curved surfaces,the inspection images always have low resolution and even artifacts due to the distortion of the wave *** this article,taking a type of aeroengine casing ring forging as an example,the Total Focusing Method(TFM)algorithms for curved surfaces are ***,the Acoustic Field Threshold Segmentation(AFTS)algorithm is proposed to reduce background noise and data ***,the Vector Coherence Factor(VCF)is adopted to improve the lateral resolution of the TFM ***,a series of 0.8 mm diameter Side-Drilled Holes(SDHs)are machined below convex and concave surfaces of the *** quantitative comparison of the detection images using the conventional TFM,AFTS-TFM,VCF-TFM,and AFTS-VCF-TFM is implemented in terms of data volume,imaging Signal-to-Noise Ratio(SNR),and defect echo *** results show that compared with conventional TFM,the data volume of AFTS-VCF-TFM algorithm for convex and concave is decreased by 32.39%and 73.40%,***,the average SNR of the AFTS-VCF-TFM is gained up to 40.0 dB,while the average 6 dB-drop echo width of defects is reduced to 0.74 mm.

关键词： Aeroengine casing Acoustic Field Threshold Segmentation(AFTS) curved surfaces Total Focusing Method(TFM) Vector Coherence Factor(VCF)

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Research on Planar Development of curved surfaces

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Journal of Shanghai University(English Edition) 2003年第2期7卷 185-190页

作者：梁伟文宾鸿赞 SchoolofMechanicalScienceandEngineering

Development of curved surface is a useful tool in CAD(computer aided design) and CAGD(computer aided geometric design).This paper presents the algorithms for developing (flattening) a smooth continuous curved surface embedded in three dimensional space into a planar shape. First the definition of planar development of a curved surface is presented, and the distortions (at length and area) of development are discussed in this paper. Then several planar flattening methods of curved surface, and their advantages and disadvantages are analyzed in detail. For NURBS(non uniform rational basic spline) surfaces, which are broadly used in CAGD, we put forward a new planar developing algorithm, i.e. hybrid developing, and present the steps of the algorithm. At last, some examples are used to show the effectiveness of the algorithm.

关键词： planar development curved surfaces NURBS.

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Conformal manufacturing of soft deformable sensors on the curved surface

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International Journal of Extreme Manufacturing 2021年第4期3卷 1-21页

作者： Wanqing Zhang Ling Zhang Yabin Liao Huanyu Cheng Department of Engineering Science and Mechanics The Pennsylvania State UniversityPennsylvaniaPA 16802United States of America James Watt School of Engineering University of GlasgowG128QQ GlasgowUnited Kingdom State Key Laboratory of Advanced Welding&Joining Flexible Printed Electronics Technology CenterHarbin Institute of TechnologyShenzhen 518055People’s Republic of China Department of Mechanical Engineering Technology Pennsylvania State University-ErieThe Behrend CollegeEriePA 16563United States of America Department of Materials Science and Engineering The Pennsylvania State UniversityPennsylvaniaPA 16802United States of America Department of Mechanical Engineering The Pennsylvania State UniversityPennsylvaniaPA 16802United States of America Department of Biomedical Engineering The Pennsylvania State UniversityPennsylvaniaPA 16802United States of America

Health monitoring of structures and people requires the integration of sensors and devices on various 3D curvilinear,hierarchically structured,and even dynamically changing ***,it is highly desirable to explore conformal manufacturing techniques to fabricate and integrate soft deformable devices on complex 3D curvilinear *** planar fabrication methods are not directly suitable to manufacture conformal devices on 3D curvilinear surfaces,they can be combined with stretchable structures and the use of transfer printing or assembly methods to enable the device integration on 3D *** with functional nanomaterials,various direct printing and writing methods have also been developed to fabricate conformal electronics on curved surfaces with intimate contact even over a large *** a brief summary of the recent advancement of the recent conformal manufacturing techniques,we also discuss the challenges and potential opportunities for future development in this burgeoning field of conformal electronics on complex 3D surfaces.

关键词： conformal manufacturing soft deformable sensors curved surfaces transfer printing direct printing and writing methods

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Symmetrical Fundamental Tensors, Differential Operators, and Integral Theorems in Differential Geometry

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Tsinghua Science and Technology 2008年第2期13卷 121-126页

作者：殷雅俊吴继业尹杰 Department of Engineering Mechanics School of Aerospace Tsinghua University

To make the geometrical basis for soft matters with curved surfaces such as biomembranes as simple as possible, a symmetrical analytical system was developed in conventional differential geometry. The conventional second fundamental tensor is replaced by the so-called conjugate fundamental tensor. Because the differential properties of the conjugate fundamental tensor and the first fundamental tensor are symmetrical, the symmetrical analytical system including the symmetrical differential operators, symmetrical differential characteristics, and symmetrical integral theorems for tensor fields defined on curved surfaces can be constructed. From the symmetrical analytical system, the symmetrical integral theorems for mean curvature and Gauss curvature, with which the symmetrical Minkowski integral formulas are easily deduced just as special cases, can be derived. The applications of this symmetrical analytical system to biology not only display its simplicity and beauty, but also show its powers in depicting the symmetrical patterns of networks of biomembrane nanotubes. All these symmetrical patterns in soft matters should be just the reasonable and natural results of the symmetrical analytical system.

关键词： gradient operators integral theorems tensor fields curved surfaces

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Integral Theorems Based on a New Gradient Operator Derived from Biomembranes (Part I): Fundamentals

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Tsinghua Science and Technology 2005年第3期10卷 372-375页

作者：殷雅俊 Department of Engineering Mechanics School of Aerospace Tsinghua University Beijing 100084 China

A new gradient operator was derived in recent studies of topological structures and shape transi- tions in biomembranes. Because this operator has widespread potential uses in mechanics, physics, and biology, the operator’s general mathematical characteristics should be investigated. This paper explores the integral characteristics of the operator. The second divergence and the differential properties of the operator are used to demonstrate new integral transformations for vector and scalar fields on curved surfaces, such as the second divergence theorem, the second gradient theorem, the second curl theorem, and the second circulation theorem. These new theorems provide a mathematical basis for the use of this operator in many disciplines.

关键词： gradient operator integral theorem curved surfaces biomembranes

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