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Effects of thermo-magneto-electro nonlinearity characteristics on the stability of functionally graded piezoelectric beam

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Applied Mathematics and Mechanics(English Edition) 2020年第2期41卷 313-326页

作者： Haohao BI Bo wang Zichen DENG shuodao wang Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710072China Ministry of Industry and Information Technology Key Laboratory of Dynamics and Control of Complex Systems Northwestern Polytechnical UniversityXi’an 710072China Department of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China School of Mechanical and Aerospace Engineering Oklahoma State UniversityOklahoma 74078U.S.A.

Due to the increasing interests in using functionally graded piezoelectric materials(FGPMs) in the design of advanced micro-electro-mechanical systems, it is important to understand the stability behaviors of the FGPM beams. In this study, considering the effects of geometrical nonlinearity, temperature, and electricity in the constitutive relations and the effect of the magnetic field on the FGPM beam, the Euler-Bernoulli beam model is adopted, and the nonlinear governing equation of motion is derived via Hamilton's principle. A perturbation method, which can decompose the deflection into static and dynamic components, is utilized to linearize the nonlinear governing equation. Then,a dynamic stability analysis is carried out, and the approximate analytical solutions for the nonlinear frequency and boundary frequencies of the unstable region are *** examples are performed to verify the present analysis. The effects of the static deflection, the static load factor, the temperature change, and the magnetic field flux on the stability behaviors of the FGPM beam are discussed. From the proposed analytical solutions and numerical results, one can easily and clearly find the effects of various controlled parameters, such as geometric and physical properties of the system, on the mechanical behaviors of structures, and the conclusions are very important and useful for the design of micro-devices.

关键词： functionally graded piezoelectric material(FGPM) geometrical nonlinearity stability analysis

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Analytical study of wrinkling in thin-film-on-elastomer system with finite substrate thickness

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Applied Mathematics and Mechanics(English Edition) 2017年第4期38卷 469-478页

作者： Xianhong MENG Guanyu LIU Zihao wang shuodao wang School of Aeronautic Science and Engineering Beihang University School of Mechanical and Aerospace Engineering Oklahoma State University

Surface wrinkling, a film bonded on a pre-strained elastomeric substrate can form periodic wrinkling patterns, is a common phenomenon in daily life. In existing theoretical models, the film is much thinner than the substrate so that the substrate can be considered to be elastomeric with infinite thickness. In this paper, the effect of finite substrate thickness is analyzed theoretically for free boundary condition cases. Based on the minimum potential energy principle, a theoretical model is established, and the wave length and amplitude of the wrinkling pattern are obtained. When the thickness of the substrate is more than 200 times larger than the thickness of the film, the results of this study agree well with the results obtained from the previous models for infinite substrate thickness. However, for thin substrates, the effect of finite substrate thickness becomes significant. The model given in this paper accurately describes the effect of finite substrate thickness, providing important design guidelines for future thin-film-on-substrate systems such as stretchable electronic devices.

关键词： wrinkling finite substrate thickness theoretical mechanics model

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Third-order polynomial model for analyzing stickup state laminated structure in flexible electronics

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Acta Mechanica Sinica 2018年第1期34卷 48-61页

作者： Xianhong Meng Zihao wang Boya Liu shuodao wang School of Aeronautic Science and Engineering Beihang University Beijing 100191 China School of Mechanical and Aerospace Engineering Oklahoma State University Stillwater OK 74078 USA

Laminated hard-soft integrated structures play a significant role in the fabrication and development of flexible electronics devices. Flexible electronics have advantageous characteristics such as soft and light-weight, can be folded,twisted, flipped inside-out, or be pasted onto other surfaces of arbitrary shapes. In this paper, an analytical model is presented to study the mechanics of laminated hard-soft structures in flexible electronics under a stickup state. Thirdorder polynomials are used to describe the displacement field,and the principle of virtual work is adopted to derive the governing equations and boundary conditions. The normal strain and the shear stress along the thickness direction in the bimaterial region are obtained analytically, which agree well with the results from finite element analysis. The analytical model can be used to analyze stickup state laminated structures, and can serve as a valuable reference for the failure prediction and optimal design of flexible electronics in the future.

关键词： Flexible electronics Stickup state Third-order polynomials Virtual work principle

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Buckling analysis in stretchable electronics

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npj Flexible Electronics 2017年第1期1卷 30-38页

作者： Bo wang Siyuan Bao Sandra Vinnikova Pravarsha Ghanta shuodao wang School of Mechanical and Aerospace Engineering Oklahoma State UniversityStillwaterOK 74078USA School of Civil Engineering University of Science and Technology of SuzhouSuzhou 215011China

In the last decade,stretchable electronics evolved as a class of novel systems that have electronic performances equal to established semiconductor technologies,but can be stretched,compressed,and twisted like a rubber *** compliance and stretchability of these electronics allow them to conform and mount to soft,elastic biological organs and tissues,thereby providing attractive opportunities in health care and *** of stretchable electronic systems use an elastomeric substrate to carry an ultrathin circuit mesh that consists of sparsely distributed stiff,thin-film electronic components interconnected by various forms of stretchable metal strips or low-dimension *** the fabrication processes and application of stretchable electronics,the thin-film components or nanomaterials undergo different kinds of in-plane deformation that often leads to out-ofplane or lateral buckling,in-surface buckling,or a combination of all.A lot of creative concepts and ideas have been developed to control and harness buckling behaviors,commonly regarded as pervasive occurrences in structural designs,to facilitate fabrication of stretchable structures,or to enhance *** paper provides a brief review of recent progresses on buckling analysis in stretchable *** buckling mechanics reveals important correlations between the geometric/material properties and system performance(e.g.,mechanical robustness,deformability,structural architecture,and control).These mechanics models and analysis provide insights to design and optimize stretchable electronics for a wide range of important applications.

关键词： buckling rubber twisted

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Theoretical and experimental study of 2D conformability of stretchable electronics laminated onto skin

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Science China(Technological Sciences) 2017年第9期60卷 1415-1422页

作者： DONG WenTao XIAO Lin ZHU Chen YE Dong wang shuodao HUANG YongAn YIN ZhouPing State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China Flexible Electronics Research Center Huazhong University of Science and Technology Wuhan 430074 China School of Mechanical and Aerospace Engineering Oklahoma State University Stillwater OK 74078 USA

Smoothly attaching the stretchable epidermal electronic devices(EEDs) onto the skin surface is highly desired to improve the measurement accuracy of electrophysiological *** paper presents an analytical approach to study interfacial mechanics of the 2D planar EEDs on the checkerboard buckling patterns of human *** variation method is proposed to determine a criterion whether EEDs laminate conformally onto the skin surface under undeformed and stretched *** with low bending stiffness(thin,soft devices/backing layer),smooth and soft skin,and strong adhesion promote conformal ***,the adhesion energy at the EED/skin interface is measured by the homemade peeling experiment platform with different substrate thicknesses and areal *** upper limit of the areal coverage for EED conformal contact with the skin is proposed with given EED/skin *** of EEDs are validated by experiments with different substrate thickness,areal coverage and external *** provides a design guideline for EED to conformally contact with the skin surface for more accurate biological signal monitoring.

关键词： interfacial mechanics epidermal electronics areal coverage conformability E-skin

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Nanomeshed Si nanomembranes

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npj Flexible Electronics 2019年第1期3卷 78-85页

作者： Xun Han Kyung Jin Seo Yi Qiang Zeping Li Sandra Vinnikova Yiding Zhong Xuanyi Zhao Peijie Hao shuodao wang Hui Fang Department of Electrical and Computer Engineering Northeastern UniversityBostonMA 02115USA School of Mechanical and Aerospace Engineering Oklahoma State UniversityStillwaterOK 74074USA

One of the main challenges in stretchable electronics is to achieve high-performance stretchable semiconductors. Here, weintroduce an innovative concept of nanomeshed semiconductor nanomembrane which can be regarded almost as intrinsicallystretchable to conventional microelectronic layouts. By making a silicon film into homogeneous nanomeshes with spring-like nanotraces, we demonstrated a high electron mobility of 50 cm^(2)/V·s, and moderate stretchability with a one-time strain of 25% andcyclic strain of 14% after stretching for 1000 cycles, further improvable with optimized nanomesh designs. A simple analytic modelcovering both fractional material and trace sidewall surfaces well predicted the transport properties of the normally on siliconnanomesh transistors, enabling future design and optimizations. Besides potential applications in stretchable electronics, thissemiconductor nanomesh concept provides a new platform for materials engineering and is expected to yield a new family ofstretchable inorganic materials having tunable electronic and optoelectronic properties with customized nanostructures.

关键词： stretching inorganic fractional

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Adhesion-governed buckling of thin-film electronics on soft tissues

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Theoretical & Applied Mechanics Letters 2016年第1期6卷 6-10页

作者： Bo wang shuodao wang School of Mechanical and Aerospace Engineering Oklahoma State University

Stretchable/flexible electronics has attracted great interest and attention due to its potentially broad applications in bio-compatible systems. One class of these ultra-thin electronic systems has found promising and important utilities in bio-integrated monitoring and therapeutic devices. These devices can conform to the surfaces of soft bio-tissues such as the epidermis, the epicardium, and the brain to provide portable healthcare functionalities. Upon contractions of the soft tissues, the electronics undergoes compression and buckles into various modes, depending on the stiffness of the tissue and the strength of the interfacial adhesion. These buckling modes result in different kinds of interfacial delamination and shapes of the deformed electronics, which are very important to the proper functioning of the bio- electronic devices. In this paper, detailed buckling mechanics of these thin-film electronics on elastomeric substrates is studied. The analytical results, validated by experiments, provide a very convenient tool for predicting peak strain in the electronics and the intactness of the interface under various conditions.

关键词： Stretchable electronics Bio-electronics Buckling Work of adhesion Bio-interface

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He Li Li Sai wang Shao-Jiang wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

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Rational modulation of fluorophosphate cathode by anionic groups to reduce the polarization behavior for fast-charging sodium-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 509-521页

作者： Xinyuan wang Fan Zhang Xingyu Zhou Qian wang Changyu Liu Yangyang Liu Hui wang Xiaojie Liu Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science Northwest University

Na3V2（PO4）2O2F （VP） is recognized as a promising cathode material for sodium-ion batteries due to its stable structural framework and high specific *** functional theory （DFT） and finite element simulations show that incorporating SO42-into VP decreases its band gap,lowers the migration energy barrier,and ensures a uniform Na+concentration gradient and stress distribution during charge and discharge ***,the average Na+diffusion coefficient of Na3V2（PO4）1.95（SO4）0.05O2F（VPS-1） is roughly double that of VP,leading to enhanced rate capability (80 C,75.5 mAh g-1) and cycling stability (111.0 mAh g-1capacity after 1000 cycles at 10 C current density) for ***-1 exhibits outstanding fast-charging capabilities,achieving an 80%state of charge in just 8.1 *** assembled VPS-1//SbSn/NPC full cell demonstrated stable cycling over 200 cycles at a high 5 C current,maintaining an average coulombic efficiency of 95.35%.

关键词： Anionic group modulation Polarization behavior Fast-charging Sodium-ion battery Fluorophosphate Cathode

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Overview of in-situ oxygen production technologies for lunar resources

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 233-255页

作者： Youpeng Xu Sheng Pang Liangwei Cong Guoyu Qian Dong wang Laishi Li Yusheng Wu Zhi wang College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial ***,crucial for supporting human life on the Moon,can be extracted from lunar regolith,which is highly rich in oxygen and contains polymetallic *** oxygen and metal extraction can be achieved using existing metallurgical ***,the ample reserves of water ice on the Moon offer another means for oxygen *** paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon,drawing from an analysis of lunar resources and environmental *** delves into the principles,processes,advantages,and drawbacks of water-ice electrolysis,two-step oxygen production from lunar regolith,and one-step oxygen production from lunar *** two-step methods involve hydrogen reduction,carbothermal reduction,and hydrometallurgy,while the one-step methods encompass fluorination/chlorination,high-temperature decomposition,molten salt electrolysis,and molten regolith electrolysis(MOE).Following a thorough comparison of raw materials,equipment,technology,and economic viability,MOE is identified as the most promising approach for future in-situ oxygen production on the *** the corrosion characteristics of molten lunar regolith at high temperatures,along with the Moon's low-gravity environment,the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the *** review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

关键词： lunar resources in-situ oxygen production space metallurgy molten lunar regolith electrolysis

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