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Swell induced stress in a hydrogel coating

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Acta Mechanica Sinica 2021年第5期37卷 797-802,I0002页

作者： Shuyang Wang Zhengjin Wang Yan Yang tongqing lu State Key Lab for Strength and Vibration of Mechanical Structures Soft Machines LabSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China

A hydrogel can be coated on various substrates to enable multiple *** applications include biomedical devices,anti-fouling surfaces and *** practical use,hydrogel coatings are often submerged in *** swell of hydrogel coating deteriorates the interfacial bonding with the *** paper presents a stress analysis of a hydrogel coating on a cylindrical metal *** adopt the thermodynamic theory coupling large deformation and water migration and formulate two boundary value problems for the coating-substrate system with and without an interfacial *** inhomogeneous stress fields in the hydrogel coating are *** influences of modulus,thickness of the hydrogel coating on the maximum radial stress at the interface are *** results may guide the design of hydrogel coating to avoid interfacial failure.

关键词： Hydrogel coating Swell Interfacial crack Boundary value problem

Experimental Investigations on the Out-of-Plane Sub-harmonic Vibration of a Circular Dielectric Elastomer Actuator

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Acta Mechanica Solida Sinica 2019年第5期32卷 591-598页

作者： Cheng Ma Meng Yang Kun Jia tongqing lu State Key Laboratory for Strength and Vibration of Mechanical Structure Department of Engineering MechanicsXi'an Jiaotong UniversityXi'an 710049China

Dielectric elastomers have found interesting applications in soft loudspeakers,where vibrations subject to alternating electrical excitations are the key *** there are many t heore tical studies on the nonlinear vibrations of dielec trie elasto mers subject to electromechanical coupling loads,the systematic experimental research is *** this work,we design a simple experimental setup to observe the out-of-plane vibrations of a circular dielec trie elastomer *** find that the dielec trie elastomer has different response modes including the harmonic,super-harmonic and sub-harmonic responses at different excitation *** analyze the responses by using the short-time Fourier *** find that the equivalent voltage and the AC/DC ratio are the main parameters affecting the occurrence of sub-harmonic *** phenomenon of mode shift is also observed in our *** experimental observations provide a deeper unders tanding of the dynamic responses of dielec trie elasto mer subject to electromechanical loads.

关键词： Dielectric elastomer Nonlinear vibration Harmonic response Sub-harmonic response

Preface to the"Soft Matter Mechanics"Special Issue of Acta Mechanica Solida Sinica

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Acta Mechanica Solida Sinica 2019年第5期32卷 533-534页

作者： Jin Qian tongqing lu Shaoxing Qu Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China State Key Lab for Strength and Vibration of Mechanical Structures Department of Engineering MechanicsXi'an Jiaotong UniversityXi'an 710049China

Different from ordinary solids,liquids and gases,soft matter is a subfield of condensed matter comprising a complexity of physical states and softness that are easily modulated by external stimuli and/or thermal flue tu at ions,with the featured sensitivity to tiny perturbations from the *** soft matter research is considered to be“the science of the 21st century,”which is rapidly evolving and growing at the interfaces of mechanics,physics,biology,material science,chemistry,etc.

关键词： environment. solids gases

Highly Stretchable and Transparent Ionic Conductor with Novel Hydrophobicity and Extreme-Temperature Tolerance

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Research 2020年第1期2020卷 363-372页

作者： Lei Shi Kun Jia Yiyang Gao Hua Yang Yaming Ma Shiyao lu Guoxin Gao Huaitian Bu tongqing lu Shujiang Ding Department of Applied Chemistry School of ScienceXi’an Key Laboratory of Sustainable Energy Materials ChemistryMOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Strength and Vibration of Mechanical Structure School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China SINTEF Industry Forskningsvei 10373 OsloNorway

Highly stretchable and transparent ionic conducting materials have enabled new concepts of electronic devices denoted as iontronics,with a distinguishable working mechanism and performances from the conventional ***,the existing ionic conducting materials can hardly bear the humidity and temperature change of our daily life,which has greatly hindered the development and real-world application of ***,we design an ion gel possessing unique traits of hydrophobicity,humidity insensitivity,wide working temperature range(exceeding 100℃,and the range covered our daily life temperature),high conductivity(10^(-3)~10^(-5) S/cm),extensive stretchability,and high transparency,which is among the bestperforming ionic conductors ever developed for flexible *** ion gel-based iontronics have been demonstrated,including large-deformation sensors,electroluminescent devices,and ionic cables,which can serve for a long time under harsh *** designed material opens new potential for the real-world application progress of iontronics.

关键词： Highly humidity exceeding

Asymptotic solutions for buckling delamination induced crack propagation in the thin film-compliant substrate system

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Theoretical & Applied Mechanics Letters 2014年第4期4卷 14-19页

作者： tongqing lu Tiejun Wang State Key Lab for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi'an Jiaotong University

In a thin film-substrate system in-plane compressive stress is commonly generated in the film due to thermal mismatch in operation or fabrication process. If the stress exceeds a critical value, part of the film may buckle out of plane along the defective interface. After buckling delamination, the interface crack at the ends may propagate. In the whole process, the compliance of the substrate compared with the film plays an important role. In this work, we study a circular film subject to compressive stress on an infinitely thick substrate. We study the effects of compliance of the substrate by modeling the system as a plate on an elastic foundation. The critical buckling condition is formulated. The asymptotic solutions of post-buckling deformation and the corresponding energy release rate of the interface crack are obtained with perturbation methods. The results show that the more compliant the substrate is, the easier for the film to buckle and easier for the interface crack to propagate after buckling.

关键词： buckling delamination interface crack film-substrate system post-buckling

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...

Electromechanical phase transition of a dielectric elastomer tube under internal pressure of constant mass

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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Theoretical & Applied Mechanics Letters 2017年第3期7卷 121-125页

作者： Song Che tongqing lu T.J. Wang State Key Lab for Strength and Vibration of Mechanical Structures Department of Engineering Mechanics Xi' an Jiaotong University Xi' an 710049 China

The electromechanical phase transition for a dielectric elastomer （DE） tube has been demonstrated in recent experiments, where it is found that the unbulged phase gradually changed into bulged phase. Previous theoretical works only studied the transition process under pressure control condition, which is not consistent with the real experimental condition. This paper focuses on more complex features of the electromechanical phase transition under internal pressure of constant mass. We derive the equilibrium equations and the condition for coexistent states for a DE tube under an internal pressure, a voltage through the thickness and an axial force. We find that under mass control condition the voltage needed to maintain the phase transition increases as the process proceeds. We analyze the entire process of electromechanical phase transition and find that the evolution of configurations is also different from that for pressure control condition.

关键词： Phase transition Dielectric elastomer Electromechanical coupling Phase coexistence

农村小规模学校自主发展策略研究——基于资源依赖理论和实践经验的视角

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湖南师范大学教育科学学报 2016年第6期15卷 33-37页

作者：卢同庆范先佐华中师范大学教育学院湖北武汉430079

我国农村小规模学校担负着为农村20%弱势儿童提供教育的重任,然而资源短缺严重制约其发展。结合农村小规模学校自主发展的实践经验,运用资源依赖理论,从理论与实践的角度进行分析与提炼,农村小规模学校以拓展资源为核心的自主发展策略有... 详细信息

我国农村小规模学校担负着为农村20%弱势儿童提供教育的重任,然而资源短缺严重制约其发展。结合农村小规模学校自主发展的实践经验,运用资源依赖理论,从理论与实践的角度进行分析与提炼,农村小规模学校以拓展资源为核心的自主发展策略有三:一是重新审视组织的外部环境,寻求社会资源的支持;二是进行内生性发展,提高自身的资源创造力;三是通过联盟的方式实现资源共享,提高获取资源的能力。根据农村小规模学校自主发展的实践,政府应该在给予鼓励的同时,提供一定的政策支持,以进一步促进农村小规模学校的发展。

关键词：农村小规模学校自主发展策略资源依赖理论实践经验

Toughening Mechanism of Unidirectional Stretchable Composite

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Toughening Mechanism of Unidirectional Stretchable Composite