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| 1 | SELF-INSTABILITY AND BENDING BEHAVIORS OF NANO PLATES显示文摘This paper aims at investigating the size-dependent self-buckling and bending behaviors of nano plates through incorporating surface elasticity into the elasticity with residual stress fields.In the absence of external loading,positive surface tension induces a compressive residual stress field in the bulk of the nano plate and there may be self-equilibrium states corresponding to the plate self-buckling.The self-instability of nano plates is investigated and the critical self-instability size of simply supported rectangular nano plates is determined.In addition,the residual stress field in the bulk of the nano plate is usually neglected in the existing literatures,where the elastic response of the bulk is often described by the classical Hooke's law.The present paper considered the effect of the residual stress in the bulk induced by surface tension and adopted the elasticity with residual stress fields to study the bending behaviors of nano plates without buckling.The present results show that the surface effects only modify the coefficients in corresponding equations of the classical Kirchhoff plate theory. | Zhiqiao Wang Yapu Zhao | 2009 | Acta Mechanica Solida Sinica2009，22，6： | 10 |
| 2 | Understanding formation mechanism of ZnO diatomic chain and multi-shell structure using physical mechanics:Molecular dynamics and first-principle simulations显示文摘In this paper,the possibility of the monatomic chain (MC) formation for ZnO material was studied by molecular dynamics (MD) simulation.The process of MC formation and the effects of temperature,strain rate and size were studied extensively.The tensile process can be divided to be five stages and the ZnO diatomic chain (DC) can be found.The MD results show that most atoms in MC came from the original surface of ZnO nanowires (NWs).Temperature and strain rate are two important factors affecting the process,and both high temperature and low strain rate in a certain range would be beneficial to the formation of DC.Moreover,the effects of strain rate and temperature could attribute to the Arrhenius model and the energy release mechanism.Furthermore,multi-shell structure was found for the samples under tensile strain and the layer-layer distance was about 3.Our studies based on density functional theory showed that the most stable structure of ZnO DC was confirmed to be linear,and the I-V curve was also got using ATK. | WANG BinBin WANG FengChao ZHAO YaPu | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，6： | 9 |
| 3 | Thermo-hyperelastic models for nanostructured materials显示文摘In the framework of continuum thermodynamics, the present paper presents the thermo-hyperelastic models for both the surface and the bulk of nanostructured materials, in which the residual stresses are taken into account. Due to the existence of residual stresses, different configuration descriptions of the surface (or the bulk) thermo-hyperelastic constitutive equations are not the same even in the cases of infinitesimal deformation. As an example, the effective thermal expansion coefficient of spherical nanoparticles is analyzed. | WANG ZhiQiao ZHAO YaPu | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，5： | 9 |
| 4 | Moving contact line problem: Advances and perspectives显示文摘The solid–liquid interface, which is ubiquitous in nature and our daily life, plays fundamental roles in a variety of physical–chemical–biological–mechanical phenomena, for example in lubrication, crystal growth, and many biological reactions that govern the building of human body and the functioning of brain. A surge of interests in the moving contact line(MCL) problem, which is still going on today, can be traced back to 1970s primarily because of the existence of the 'Huh–Scriven paradox'. This paper, mainly from a solid mechanics perspective, describes very briefly the multidisciplinary nature of the MCL problem, then summarizes some major advances in this exciting research area, and some future directions are presented. | Yapu Zhao | 2014 | Theoretical & Applied Mechanics Letters2014，4，3： | 5 |
| 5 | The dispersion characteristics of the waves propagating in a spinning single-walled carbon nanotube显示文摘As the nano-motor becomes a mechanical reality, its prototype can be envisaged as nano-sized rotating machinery at a situation,albeit for different purposes, like that in the first half of the 20th century during which rotor dynamics has contributed toboosting machine power capacity. Accordingly, we take the benefit of hindsight to develop a classical framework of vibrationanalysis. Essentially, the equations of motion are formulated to cope with both the special carbon-nanotube properties and thefirst author’s previously developed spinning beam formalism, establishing a model satisfactorily verified by some availablemolecular dynamics (MD) data and classical spinning beam results extracted from the literature. The model is inexpensivebased on continuum mechanics as an alternative to the less-flexible MD method for simulating wave motion of the spinningsingle-walled carbon nanotube, yielding several interesting phenomena, including the fall-off and splitting of the wave charac-teristic curves and the unexpected gyroscopic phase property. Potential applications are proposed. | CHAN K. T ZHAO YaPu | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，10： | 5 |
| 6 | Molecular dynamics simulation of peeling a DNA molecule on substrate显示文摘Molecular dynamics (MD) simulations are performed to study adhesion and peeling of a short fragment of single strand DNA (ssDNA) molecule from a graphite surface. The critical peel-off force is found to depend on both the peeling angle and the elasticity of ssDNA. For the short ssDNA strand under investigation, we show that the simulation results can be explained by a continuum model of an adhesive elastic band on substrate. The analysis suggests that it is often the peak value, rather than the mean value, of adhesion energy which determines the peeling of a nanoscale material. | Xinghua Shi Yong Kong Yapu Zhao Huajian Gao | 2005 | Acta Mechanica Sinica2005，21，3： | 3 |
| 7 | Preface to the Special Issue on Physical Mechanics显示文摘The 23rd International Congress of Theoretical and Applied Mechanics (ICTAM2012) will be held in Beijing, China, from August 19 to 24, 2012. The Congress (ICTAM), as the most authoritative and comprehensive conference in mechanics in | ZHAO YaPu Professor Guest Editor Institute of Mechanics,Chinese Academy of Sciences | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，6： | 3 |
| 8 | Formation of wavy-ring crack in drying droplet of protein solutions显示文摘The formations of desiccation cracks and their patterns in drying droplets of protein solutions are studied experimentally. The solvent evaporation causes the dehydration self-organization phenomenon in colloidal droplets, followed by the formations of desiccation cracks. Two categories of highly ordered crack patterns, which we name 'daisy' and 'wavy-ring', are identified in the drying droplets. We explore the shifting of crack patterns from the 'daisy' to the 'wavy-ring' by varying the concentration of protein droplets. The results show that the concentration correlates with the pattern of deposition film directly, and modulates the periodicity of the crack pattern. We investigate the formations and periodicities of these two kinds of crack patterns, and obtain the scaling law of periodicity of the 'wavy-ring' crack pattern. The relationship between the deposition pattern and the highly ordered crack patterns is also examined. This study will help in understanding the formation mechanisms of crack patterns in drying droplets of protein solutions and assist the future design of crack patterns in practical applications. | GAO MengNi HUANG XianFu ZHAO YaPu | 2018 | Science China(Technological Sciences)2018，61，7： | 2 |
| 9 | On the Development of an Effective Pressure Driving System for Ultra-Low Permeability Reservoirs显示文摘Given its relevance to the exploitation of ultra-low permeability reservoirs,which account for a substantial proportion of the world’s exploited and still unexploited reserves,in the present study the development of an adequate water injection system is considered.Due to the poor properties and weak seepage capacity of these reservoirs,the water injection pressure typically increases continuously during water flooding.In this research,the impact on such a process of factors as permeability,row spacing,and pressure gradient is evaluated experimentally using a high-pressure large-scale outcrop model.On this basis,a comprehensive evaluation coefficient is introduced able to account for the effective driving pressure. | Yapu Zhang Zhengming Yang Dajian Li Xuewei Liu Xinli Zhao | 2021 | Fluid Dynamics & Materials Processing2021，17，6： | 2 |
| 10 | The effect of surface anisotropy on contact angles and the characterization of elliptical cap droplets显示文摘In this paper, the variation of contact angles of a droplet on grooved surfaces was studied from microscale to macroscale experimentally and theoretically. The experimental results indicated that the contact angle changes nonlinearly with anisotropic factor. To get clear of the changing process of contact angle on grooved surfaces from microscale to macroscale, we carried out theoretical analysis with moment equilibrium method being adopted. In addition, the variation of contact angles in different directions was investigated and a mathematic model to calculate arbitrary contact angles around the elliptic contact line was suggested. For the convenience of potential applications, a symbolic contact angle was proposed to characterize the ellipsoidal cap droplet on grooved surfaces. Our results will offer help to the future design of patterned surfaces in practical applications,and deepen the understanding of wetting behavior on grooved surfaces. | WANG ZhanLong CHEN EnHui ZHAO YaPu | 2018 | Science China(Technological Sciences)2018，61，2： | 2 |
| 11 | Deformation of PDMS membrane and mierocantilever by a water droplet: comparison between Mooney-Rivlin and linear elastic constitutive models 显示文摘 | YU Yingsong ZHAO Yapu | 2009 | Journal of Colloid and Inter- face Science2009，332，2： | 1 |
| 12 | Electromechanical model of RF MEMS switches 显示文摘 | Zhang LiXian Zhao YaPu | 2003 | Microsystem Technologies2003，，9： | 1 |
| 13 | Size Effect on the Coalescence-Induced Self-Propelled Droplet 显示文摘 | WANG Fengchao YANG Fuqian ZHAO Yapu | 2011 | Applied Physics Letters2011，98，05： | 1 |
| 14 | Pull-in instability of micro-switch actuators: model review 显示文摘 | Lin WenHui Zhao YaPu | 2008 | International of Nonlinear Sciences and Numerical Simulation2008，9，2： | 1 |
| 15 | Slip Boundary Condi- tions Based on Molecular Kinetic Theory: the Criti- cal Shear Stress and the Energy Dissipation at the Liquid- solid Interface 显示文摘 | Wang Fengchao Zhao Yapu | 2011 | Soft Matter2011，7，： | 1 |
| 16 | The head-on colliding process of binary liquid droplets at low velocity:High-speed photography experiments and modeling显示文摘 | Wang FengChao Feng JiangTao Zhao YaPu | 2008 | Journal of Colloid and Interface Science2008，326，1： | 1 |
| 17 | Numerical and analytical study on the pull-in instability of micro-structure under electrostatic loading 显示文摘 | Zhang Yin Zhao YaPu | 2006 | Sensors and Actuators A2006，127，2： | 1 |
| 18 | 显示文摘 | Ren Sili Yang Shengrong Zhao Yapu | 2004 | Acta Mechanica Sinica/Lixue Xuebao2004，20，2： | 1 |
| 19 | The size-dependent elastic properties of nanofilms with surface effects显示文摘 | GUO Jiangang ZHAO Yapu | 2005 | Journal of Applied Physics2005，98，07： | 1 |
| 20 | Hydroelectric voltage gen- eration based on water-filled single-walled carbon nanotubes显示文摘 | Yuan Quanzi Zhao Yapu | 2009 | Journal of the American Chemical Soci- ety2009，131，： | 1 |
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