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| 1 | Variational principles and governing equations in nano-dielectrics with the flexoelectric effect显示文摘The flexoelectric effect is very strong and coupled with large strain gradients for nanoscale dielectrics. At the nanoscale, the electrostatic force cannot be ignored. In this paper, we have established the electric enthalpy variational principle for nanosized dielectrics with the strain gradient and the polarization gradient effect, as well as the effect of the electrostatic force. The complete governing equations, which include the effect of the electrostatic force, are derived from this variational principle, and based on the principle the generalized electrostatic stress is obtained, the generalized electrostatic stress contains the Maxwell stress corresponding to the polarization and strain, and stress related to the polarization gradient and strain gradient. This work provides the basis for the analysis and computations for the electromechanical problems in nanosized dielectric materials. | HU ShuLing & SHEN ShengPing* MOE Key Laboratory for Strength and Vibration, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，8： | 11 |
| 2 | Thermoelastic properties of sandwich materials with pin-reinforced foam cores显示文摘Pin-reinforced foam is a novel type of sandwich core materials formed by inserting pins(trusses) into a foam matrix to create a truss-like network reinforced foam core.Upon loading,the pins deform predominantly by local stretching whilst the deformation of foam is governed by local bending.This paper presents a theoretical study on the thermoelasticity of pin-reinforced foam sandwich cores.To calculate the effective thermoelastic properties of pin-reinforced foam cores,the energy-based homogenization approach is employed to develop a micromechanics-based model,calibrated by the existing experimental data.It is found that the stiffness of the sandwich core is mainly governed by pin reinforcements:the foam matrix contributes little to sandwich stiffness.Compared with traditional foam cores without pin reinforcements,the changes in inplane thermal expansion coefficients are not vigorous as a result of pin reinforcements,while the through-thickness thermal expansion coefficient changes significantly.It is also demonstrated that it is possible to design materials with zero or negative thermal expansion coefficients under such a context. | LU TianJian1,LIU Tao2,3 & DENG ZiChen2,4 1 MOE Key Laboratory of Strength and Vibration,School of Aerospace,Xi’an Jiaotong University,Xi’an 710049,China 2 Department of Engineering Mechanics,Northwestern Polytechnical University,Xi’an 710072,China 3 Department of Engineering,University of Cambridge,Cambridge CB2 1PZ,UK 4 State Key Laboratory of Structural Analysis of Industrial Equipment,Dalian University of Technology,Dalian 116024,China | 2008 | Science China(Technological Sciences)2008，51，12： | 10 |
| 3 | Ultralight X-type lattice sandwich structure (Ⅱ):Micromechanics modeling and finite element analysis显示文摘The methods of homogenization and finite elements are employed to predict the effective elastic constants and stress-strain responses of a new type of lattice structure,the X-structure proposed by the authors in a companion paper. It is shown that in most cases the predictions by the equivalent homogenization theory agree well with the experimental and 3-dimensional finite element calculated results. The theoretical and numerical study supports the argument that the X-structure is superior to the pyramid lattice structure in terms of mechanical strength. | ZHANG QianCheng1,CHEN AiPing 2,CHEN ChangQing2,3 & LU TianJian2 1 State Key Laboratory for Mechanical Behavior of Materials,School of Material Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China 2 MOE Key Laboratory for Strength and Vibration,School of Aerospace,Xi’an Jiaotong University,Xi’an 710049,China 3 Department of Engineering Mechanics,AML,Tsinghua University,Beijing 100084,China | 2009 | Science China(Technological Sciences)2009，52，9： | 9 |
| 4 | Characteristics of dry friction backward whirl—A self-excited oscillation in rotor-to-stator contact systems显示文摘In this paper,the response characteristics of dry friction backward whirl of a general rotor/stator model,which accounts for both the dynamics of the rotor and the stator as well as the friction and the deformation at the contact surfaces,are investigated.The existence boundaries and the whirl frequencies of the dry friction backward whirl are determined analytically.It is found that there are two or three existence boundaries of the dry friction backward whirl that usually form two existence regions,either standing completely separately,or overlapping each other partly,or one containing the other completely,depending upon the system parameters.The whirl frequencies in the two existence regions are quite different and may jump between the lower and the higher values with the variation of the rotating speed.The results have been found to have good correspondence in the related rotor/stator rubbing experiments. | JIANG Jun,SHANG ZhiYong & HONG Ling MOE Key Laboratory of Strength and Vibration,Xi’an Jiaotong University,Xi’an 710049,China | 2010 | Science China(Technological Sciences)2010，53，3： | 8 |
| 5 | A nonlinear POD reduced order model for limit cycle oscillation prediction显示文摘As the amplitude of the unsteady flow oscillation is large or large changes occur in the mean background flow such as limit cycle oscillation,the traditional proper orthogonal decomposition reduced order model based on linearized time or frequency domain small disturbance solvers can not capture the main nonlinear features.A new nonlinear reduced order model based on the dynamically nonlinear flow equation was investigated.The nonlinear second order snapshot equation in the time domain for proper orthogonal decomposition basis construction was obtained from the Taylor series expansion of the flow solver.The NLR 7301 airfoil configuration and Goland+ wing/store aeroelastic model were used to validate the capability and efficiency of the new nonlinear reduced order model.The simulation results indicate that the proposed new reduced order model can capture the limit cycle oscillation of aeroelastic system very well,while the traditional proper orthogonal decomposition reduced order model will lose effectiveness. | CHEN Gang *,LI YueMing & YAN GuiRong MOE Key Laboratory for Strength & Vibration,College of Aerospace,Xi’an Jiaotong University,Xi’an 710049,China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，7： | 7 |
| 6 | Novel strengthening methods for ultralightweight sandwich structures with periodic lattice cores显示文摘Recent development of ultralightweight lattice-cored sandwiches is reviewed,with focus placed on various novel fabrication methods introduced to strengthen these structures,covering not only research results published in the Science China Series E-Tech Sci,but also those in other domestic and overseas scientific journals. | LU TianJian 1 &ZHANG QianCheng 2 1 MOE Key Laboratory for Strength and Vibration,School of Aerospace,Xi’an Jiaotong University,Xi’an 710049,China 2 State Key Laboratory for Mechanical Behavior of Materials,School of Material Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China | 2010 | Science China(Technological Sciences)2010，53，3： | 5 |
| 7 | Structure of the Intermetallic Compound Ni_3Al Synthesized under Compression of the Powder Mixture of Pure Elements Part Ⅰ: Phase Composition and Microstructure of Main Phase显示文摘It was shown by TEM and X-ray analysis that there are four types of grains of the main Ni3Al phase in the structure of the intermetallic obtained by the self-propagation high temperature method (SHS). Every type of grains has its own domain and dislocation structure. There are mono- and polydomains with and without dislocations. The grains of the main phase of monoand polydomains without dislocations and polydomains with dislocations were formed by diffusion in the solid phase. In these conditions NiAl3 phase is located on the grain boundary of the main phase. The Ni2Al3 phase is located at the triple joints of the main phase. | M. V. Fedorischeva, V.E.Ovcharenko, O.B.Perevalova and E. V. Kozlov(Institute of Strength Physics and Materials Science, Russian Academy of Sciences, Siberian Branch, Tomsk, Russia) | 1999 | Journal of Materials Science & Technology1999，15，6： | 4 |
| 8 | An analytical solution for the elastic fields near spheroidal nano-inclusions显示文摘When the size of an inclusion shrinks to nanometers,interface energy plays an important role in the deformationaround it. In the present paper, we consider the effect ofinterface energy on the elastic fields near a spheroidal nano-inclusionembedded in an elastic medium on the basis of surfaceelasticity theory. Using Boussinesq-Sadowsky potentialfunction method, we obtain the deformation field near theinclusion subjected to a uniformly uniaxial loading at infinity.The results show that the elastic fields near the nano-inclu-siondepend strongly on the interface properties, the size andshape of inclusion. These new characteristics may be helpfulto understand various relevant mechanical performances ofnanosized inhomogeneities. | Z. Y. Ou G. F. Wang T. J. Wang Department of Engineering Mechanics,MOE Key Laboratory for Strength and Vibration,Xi’an Jiaotong University, Xi’an 710049, China | 2009 | Acta Mechanica Sinica2009，25，6： | 4 |
| 9 | EFFECT OF STRAIN RATE(?) ON STRAIN HARDENING EXPONENT n OF SOME METALLIC MATERIALS显示文摘Fariabh strain rate tension tests for 4 metallic materials show that as the strain rate in creases the strain hardening exponent n decreases.The trend follows a two stage linear relation between n and lg(?).When (?)<(?)ep’i.e.under quasi-statie loading,n can be consideredas a constant,but when(?)>(?)ep’,n decreases rapidlv till an ideal plastic state,n=0.Thecharacteri=ations and mechanisms of so fiening induced by high (?)are discussed. | TANG Changguo, ZHU Jinhua, ZHANG Yuhua, ZHOU HuijiuResearch Institute for Strength of Metals. Xi’an Jiaotong University. Xi’an. China | 1994 | Acta Metallurgica Sinica(English Letters)1994，7，3： | 4 |
| 10 | Influence of Al Composition on the Microstructure of B Alloyed Ni_3Al Synthesized under Compression显示文摘It was shown by TEM and X-ray analysis that Ni3Al is the main phase of the intermetallic synthesized under compression from the powder mixture of Ni with Al alloyed by B. The Ni3B is a secondary phase. The value of the lattice parameter of the intermetallic Ni3Al with and without B increases when the concentration of Al increases. The increase in Al concentration from 23.5 to 25.0 in the initial powder mixture leads to decreasing the solubility of B in the Ni3Al phase. | M.V.Fedorischeva, O.B.Perevalova and V.E.Ovcharenko Institute of Strength Physics and Materials Science, Russian Academy of Sciences, Siberian Branch 634021, Tomsk, Russia B. V.Kozlov State University of Architecture and Building, Solyanaya Sq.2, 634003, | 2001 | Journal of Materials Science & Technology2001，17，2： | 3 |
| 11 | EFFECT OF SUBSTRUCTURE AND RESIDUAL STRESS IN STRENGTHENED LAYER ON FATIGUE STRENGTH OF STAINLESS OR LOW CARBON STEEL显示文摘In the strengthened layer of stainless steel after shot peening,there are a great amount ofdeformation microtwins which may act as structural strengthening factor and prevent thegradual relaxation of surface residual stress during fatigue,so as to keep its rather high levelof bending fatigue strength.However,in the strengthened surface layer of low carbon steel,dislocation cell structure is so unstalbe during fatigue that its surface residual stress relaxationcannot be retarded.Therefore,the bending fatigue strength of the low carbon steel can not beimprored by shot peening. | TAN Yuxu REN Liping LI Gang Xi’an Jiaotong University,Xi’an,China TAN Yuxu Associate Professor,Institute of Metallic Materials and Strength,Xi’an Jiaotong University,Xi’an 710048,China | 1990 | Acta Metallurgica Sinica(English Letters)1990，3，2： | 2 |
| 12 | MATHEMATICAL SIMULATION OF HEAT AND MASS TRANSFER IN PULSED ARC WELDING BY MELTING ELECTRODE显示文摘In this paper the processes of melting and transfer of an electrode metal to the molten pool, hydrody- namics of molten pool in controlled pulsed arc welding in carbon dioxide have been investigated.The process of pulsed arc welding with systematic short - circuits of the arc gap is realized by adaptive algo- rithms of pulsed control over main energetic parameters of welding - arc current and voltage,arc heated efficiency,peak,short - circuiting current, which provide the dosage of energy for energy for melting and transfer of every for of an electrode metal, the control over fluidity of the weld pool. Physica and mathematical models describing such processes in CO2, origind software hare been developed.The re- sults of physical simulation and mathemaical modelling permit to determine the influence of energetic parameters of the process on the condition of the 'power source-electrode-arc-molten pool' electrodynamic system at each moment of time. | O.I.Shpigunova S. V. Shpigunov Yu.N. Saraev (Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences,Tom- sk, Russia) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 2 |
| 13 | 8% C sintered steel using Fe-Cu alloy powder显示文摘 | Iwaoka T Fujiki A Microstructure and strength of Fe-2% Cu-0 | 2014 | Journal of the Japan Society of Powder and Powder Metallurgy2014，61，6： | 1 |
| 14 | entitled 14th International Biochemistry of Exercise Conference-Muscles as Molecular and Metabolic Machines, and has undergone the Journal's usual peer review process显示文摘 | HAWLEY J A Molecular responses to strength and endurance training: Are they incompatible? This paper article is one of a selection of papers published in this Special Issue | 2009 | Appl Physiol Nutrition Metabolism2009，34，3： | 1 |
| 15 | Radius bone ng, compression, and falling and its corcal densitometry at multiple sites显示文摘 | Lochmuller EM strength in bend relation with clin Bone Miner Res Lill CA Kuhn V | 2002 | J2002，17，： | 1 |
| 16 | A probabilistic theory of the strength of short-fibre composites with variable fihre length and orientation 显示文摘 | strength of paper and other Journal of Applied Physics FUKUDA H CHOU T W | 1982 | Journal of Materials Science1982，17，4： | 1 |
| 17 | American Academy of Child and Adolescent显示文摘 | Goodman R Psychometric Properties of the Strengths and Difficulties Questionnaire | 2000 | Psychiatry2000，40，11： | 1 |
| 18 | Implications for individual impact of high lean mass and high fat mass on relationship between BMI and insulin sensitivity显示文摘 | Gippini A Mato A Pazos R Effect of long-term strength training on glucose metabolism | 2002 | J Endocrinol Invest2002，25，6： | 1 |
| 19 | A prospective comparison of the posterior and lateral approach in 100 patients 显示文摘 | Downing ND Clark DI Hutchinson JW et aL Hip abductor strength following total hip arthroplasty | 2001 | Acta Orthop Scand2001，72，3： | 1 |
| 20 | Behavior of composite beam to column onnections: experimental study and numerical simulations 显示文摘 | Vasdravellis G Valente M exterior partial strength Castiglioni C A | 2009 | Journal of Constructional Steel Research2009，65，1： | 1 |
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