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A FINITE ELEMENT METHOD FOR DIELECTRIC ELASTOMER TRANSDUCERS

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Acta Mechanica Solida Sinica 2012年第5期25卷 459-466页

作者： Shaoxing Qu zhigang suo Department of Engineering Mechanics Zhejiang UniversityHangzhou 310027China Soft Matter Research Center(SMRC) Zhejiang UniversityHangzhou 310027China School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA

We present a finite element method for dielectric elastomer （DE） transducers based on the nonlinear field theory of DE. The method is implemented in the commercial finite element software ABAQUS, which provides a large library functions to describe finite elasticity. This method can be used to solve electromechanical coupling problems of DE transducers with complex configurations and under inhomogeneous deformation.

关键词： finite element method dielectric elastomer electromechanical coupling

Functional hydrogel coatings

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National Science Review 2021年第2期8卷 151-169页

作者： Junjie Liu Shaoxing Qu zhigang suo Wei Yang Center for X-Mechanics Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province and Department of Engineering MechanicsZhejiang University State Key Laboratory of Fluid Power and Mechatronic System Zhejiang University Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong University John A.Paulson School of Engineering and Applied Sciences Kavli Institute for Bionano Science and TechnologyHarvard University

Hydrogels—natural or synthetic polymer networks that swell in water—can be made mechanically,chemically and electrically compatible with living tissues. There has been intense research and development of hydrogels for medical applications since the invention of hydrogel contact lenses in 1960. More recently,functional hydrogel coatings with controlled thickness and tough adhesion have been achieved on various substrates. Hydrogel-coated substrates combine the advantages of hydrogels, such as lubricity,biocompatibility and anti-biofouling properties, with the advantages of substrates, such as stiffness,toughness and strength. In this review, we focus on three aspects of functional hydrogel coatings:(i) applications and functions enabled by hydrogel coatings,(ii) methods of coating various substrates with different functional hydrogels with tough adhesion, and(iii) tests to evaluate the adhesion between functional hydrogel coatings and substrates. Conclusions and outlook are given at the end of this review.

关键词： hydrogel coatings coating methods coating tests adhesion hydrogel applications

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Topological prime

Science China(Technological Sciences) 2020年第7期63卷 1314-1322页

作者： YANG XuXu YANG CanHui LIU JunJie YAO Xi suo zhigang John A.Paulson School of Engineering and Applied Sciences Kavli Institute for Bionano Science and TechnologyHarvard UniversityCambridge MA 02138USA State Key Laboratory of Fluid Power&Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering Mechanics and Center for X-MechanicsZhejiang UniversityHangzhou 310027China Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen 518055China Key Lab for Special Functional Materials of Ministry of Education Henan UniversityKaifeng 475004China

This paper describes a general method, called topological prime, to stitch functional groups to a substrate of entropic polymer network. The precursor of a topological primer contains polymers, crosslinkers, and coupling agents. When the precursor is applied on the surface of the substrate, the crosslinkers link the primer polymers into a primer network, in topological entanglement with the substrate network, while the coupling agents link the primer network to the functional groups. The use of topological prime is demonstrated by priming a hydrophobic elastomer of an arbitrary shape for hydrophilic coating. We describe an approach that fulfills two fundamental requirements: wetting and adhesion. The coated elastomer maintains hydrophilicity and lubricity after stretch, scratch, swell, and slide. As a further demonstration, a hydrogel substrate is primed for hydrophobic coating. Topological prime opens an enormous space for applications in engineering and biomedicine.

关键词： elastomer hydrogel hydrophilic coating topological prime functional groups

Extension limit,polarization saturation,and snap-through instability of dielectric elastomers

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International Journal of Smart and Nano Materials 2011年第2期2卷 59-67页

作者： Bo Li Liwu Liu zhigang suo School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049 PRC School of Engineering and Applied Sciences Kavli Institute for Bionano Science and TechnologyHarvard UniversityCambridgeMA 02138USA Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001PRC

A dielectric elastomer is capable of large voltage-induced deformation,particularly when the voltage is applied on the verge of snap-through instability.A model is described which shows that the snap-through instability is markedly affected by both the extension limit of polymer chains and the polarization saturation of *** model may guide the search for high-performance dielectric elastomer transducers.

关键词： dielectric elastomer polarization saturation stabilization

Degradable Plastics Are Vulnerable to Cracks

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Engineering 2021年第5期7卷 624-629页

作者： Xuxu Yang Jason Steck Jiawei Yang Yecheng Wang zhigang suo John A.Paulson School of Engineering and Applied Sciences Kavli Institute for Bionano Science and TechnologyHarvard UniversityCambridgeMA 02138USA State Key Laboratory of Fluid Power and Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang ProvinceDepartment of Engineering Mechanics&Center for X-MechanicsZhejiang UniversityHangzhou 310027China

A plastic may degrade in response to a *** kinetics of degradation have long been characterized by the loss of weight and strength over *** methods of gross characterization,however,are misleading when plastic degrades ***,we study heterogeneous degradation in an extreme form:the growth of a crack under the combined action of chemistry and *** applied load opens the crack,exposes the crack front to chemical attack,and causes the crack to outrun gross *** studied the crack growth in polylactic acid(PLA),a polyester in which ester bonds break by *** cut a crack in a PLA film using scissors,tore it using an apparatus,and recorded the crack growth using a camera through a *** our testing range,the crack velocity was insensitive to load but was sensitive to humidity and *** findings will aid the development of degradable plastics for healthcare and sustainability.

关键词： Degradation Plastics Hydrolysis pH Cracking

MICROMECHANICS OF MACROELECTRONICS

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China Particuology 2005年第6期3卷 321-328页

作者： zhigang suo Joost Vlassa Sigurd Wagner Division of Engineering and Appfied Sciences Harvard University Cambridge MA 02138 USA Department of Electrical Engineering and Princeton Institute for the Science and echnology of Materials Princeton University Princeton NJ 08544 USA

The advent of flat-panel displays has opened the era of macroelectronics. Enthusiasm is gathering to develop macroelectronics as a platform for many technologies, ranging from paper-like displays to thin-film solar cells, technologies that aim to address the essential societal needs for easily accessible information, renewable energy, and sustainable environment. The widespread use of these large structures will depend on their ruggedness, portability and low cost, attributes that will come from new material choices and new manufacturing processes. For example, thin-film devices on thin polymer substrates lend themselves to roll-to-roll fabrication, and impart flexibility to the products. These large structures will have diverse architectures, hybrid materials, and small features; their mechanical behavior during manufacturing and use poses significant challenges to the creation of the new technologies. This paper describes ongoing work in the emerging field of research-the mechanics of macroelectronics, with emphasis on the mechanical behavior at the scale of individual features, and over a long time.

关键词： macroelectronics flexible electronics ductility cracking adhesion thin films

THEORY OF DIELECTRIC ELASTOMERS

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Acta Mechanica Solida Sinica 2010年第6期23卷 549-578页

作者： zhigang suo (School of Engineering and Applied Sciences,Kavli Institute for Nanobio Science and Technology,Harvard University,Cambridge,MA 02138,USA) [a] School of Engineering Applied Sciences Kavli Institute for Nanobio Science Technology Harvard University Cambridge MA 02138 USA

In response to a stimulus, a soft material deforms, and the deformation provides a function. We call such a material a soft active material （SAM）. This review focuses on one class of soft active materials： dielectric elastomers. When a membrane of a dielectric elastomer is subject to a voltage through its thickness, the membrane reduces thickness and expands area, possibly straining over 100%. The dielectric elastomers are being developed as transducers for broad applications, including soft robots, adaptive optics, Braille displays, and electric generators. This paper reviews the theory of dielectric elastomers, developed within continuum mechanics and thermodynamics, and motivated by molecular pictures and empirical observations. The theory couples large deformation and electric potential, and describes nonlinear and nonequilibrium behavior, such as electromechanical instability and viscoelasticity. The theory enables the finite element method to simulate transducers of realistic configurations, predicts the efficiency of electromechanical energy conversion, and suggests alternative routes to achieve giant voltage-induced deformation. It is hoped that the theory will aid in the creation of materials and devices.

关键词： soft active material, dielectric elastomer, electromechanical instability, large deformation transducer

Effect of loading path on the voltage induced deformation of dielectric elastomers membranes under equal biaxial stress state

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Effect of loading path on the voltage induced deformation of...

Adhesive anastomosis for organ transplantation

中国力学大会——2013

作者： Lu Tongqing Li Tiefeng suo zhigang Wang Tiejun Key Laboratory for Mechanical Structural Strength and Vibration Xi'an Jiaotong University Institute of Applied Mechanics Zhejiang University School of Engineering and Applied Sciences Harvard University

In this *** theoretically analyze the effect of loadingpath on the voltage induced deformation of dielectric elastomers. We consider several dielectric elastomer membranes in the same equal biaxial stress *** under different loading conditions or boundary *** mapping different loading paths on the same 3-D diagram of space of state,we clearly

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Bioactive Materials 2022年第7期7卷 260-268页

作者： Kang Liu Hang Yang Gaobo Huang Aihua Shi Qiang Lu Shanpei Wang Wei Qiao Haohua Wang Mengyun Ke Hongfan Ding Tao Li Yanchao Zhang Jiawei Yu Bingyi Ren Rongfeng Wang Kailing Wang Hui Feng zhigang suo Jingda Tang Yi Lv National Local Joint Engineering Research Center for Precision Surgery and Regenerative Medicine Department of Hepatobiliary SurgeryFirst Affiliated Hospital of Xi’an Jiaotong UniversityXi’an710061Shaanxi ProvinceChina State Key Lab for Strength and Vibration of Mechanical Structures International Center for Applied MechanicsDepartment of Engineering MechanicsXi’an Jiaotong UniversityXi’an710049China John A.Paulson School of Engineering and Applied Science Kavli Institute for Bionano Science and TechnologyHarvard UniversityCambridgeMA02138USA Hepatobiliary Surgery Department Shaanxi Provincial People’s HospitalXi’an710068Shaanxi ProvinceChina

The recent development of tough tissue adhesives has stimulated intense interests among material scientists and medical ***,these adhesives have seldom been tested in clinically demanding *** we demonstrate adhesive anastomosis in organ *** is commonly conducted by dense sutures and takes a long time,during which all the vessels are *** occlusion may damage organs and even cause *** formulate a tough,biocompatible,bioabsorbable adhesive that can sustain tissue tension and pressurized *** expose the endothelial surface of vessels onto a gasket,press two endothelial surfaces to the adhesive using a pair of magnetic rings,and reopen the bloodstream *** time for adhesive anastomosis is shortened compared to the time for sutured *** have achieved adhesive anastomosis of a great vein in transplanting the liver of a *** the surgery,the adhesive is absorbed,the vein heals,and the pig lives for over one month.

关键词： Magnet Hydrogel Adhesive Anastomosis Liver transplantation