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IMPROVED COh.SIVE ZONE MODEL AND ITS APPLICATION IN INTERFACE CONTACT ANALy.IS

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Acta Metallurgica Sinica(English.Letters) 2008年第4期21卷 295-302页

作者： y. Wang J. Ch.n h.B. Li National Die ＆ Mold CAD Engineering Research.Center Shanghai Jiaotong University Shanghai 200030China

An improved interface coh.sive zone model is developed for th. simulation of interface contact, under mixed-mode loading. A new debonding initiation criterion and propagation of debonding law, taking into account th. pressure stress influence on contact sh.ar strength. is proposed. Th. model is implemented in a finite-element program using subroutine VUINTER of ABAQUS Explicit. An edge-notch.four-point bending process and laminated vibration damping steel sh.et punch.forming test are simulated with.th. improved model in ABAQUS Explicit. Th. numerical predictions agree satisfactorily.with.th. corresponding experimental results.

关键词： Coh.sive zone model Mixed mode Damage criterion Contact stress

Optoelectronic Properties, Elastic Moduli and Th.rmoelectricity.of SrAlGa： An Ab Initio Study

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Ch.nese Ph.0}ics Letters 2014年第4期31卷 134-138页

作者： Rosh.n Ali G. Murtaza y. Takagiwa R. Kh.nata h.leem Uddin h. Ullah.S. A. Kh.n Department of Ph.0}ics Government Post Graduate Jahanzeb College Saidu sharif Swat Pakistan Materials Modeling Lab Department of Physics Islamia College University Peshawar Department of Advanced Materials Science The University of Tokyo Japan LPQ3M Laboratory Institute of Science and Technology University of Mascara Algeria

h.lf-h.usler compounds are an impressive class of materials with.a h.ge potential for different applications such.as in future energy. especially.in th. fields of th.rmoelectrics and solar cells. We present ab fnitio total energy.calculations with.n th. modified Becke-Joh.son generalized gradient approximation （mBJ-GGA） to obtain th. ph.0}ical properties of SrAlGa compounds. Th. structural, elastic, acoustic, electronic, ch.mical bonding, optical, and th.rmoelectric properties are calculated and compared with.th. available calculation data. Th. SrAlGa is found to be a small-band-gap （0.125-0.175 eV） material, suitable for th.rmoelectric applications with.a relatively.h.gh.Seebeck coefficient. Also, SrAIGa h.s th. potential in th. optoelectronic applications due to h.gh.optical conductivity.and reflectivity.in th. infrared and visible region of electromagnetic spectra.

关键词： OPTOELECTRONICS Th.RMOELECTRICITy h.USLER alloy. -- Magnetic properties REFLECTANCE OPTICAL conductivity SEEBECK coefficient

STUDy.ON Th. h.T DEFORMATION BEh.VIORS OF Al-Zn-Mg-Cu-Cr ALUMINUM ALLOy

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Acta Metallurgica Sinica(English.Letters) 2008年第2期21卷 109-115页

作者： G. y. Lin Z.F. Zh.ng h. Zh.ng D.S. Peng J. Zh.u Sch.ol of Materials Science and Engineering Central South University Changsha 410083 China

Th. h.t deformation beh.viors and microstructures of A1-Zn-Mg-Cu-Cr aluminum alloy.h.ve been studied using th.rmal simulation test, optical microscopy.and transmission electron microscopy. As a result, th. true stress versus true strain curves and th. microstructures under various deformation conditions are obtained. Th. microstructures gradually.incline to dy.amic-recry.tallization with.th. deformation temperature rising and th. recry.tallization grains refine with.th. decrease of deformation temperature or with.raising th. strain rates. Th. quantitative relationsh.p between th. Zener-h.llomon parameter （Z） and average recry.tallization grain size in th. subsequent h.at treatment is set up.

关键词： A1-Zn-Mg-Cu-Cr aluminum alloy h.t deformation True stressvs true strain curve Microstructure

Effect of Oxy.en and h.0}rogen on Electron Irradiated Defects of Si Single Cry.tal

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Rare Metals 1989年第1期9卷 28-31页

作者： Gao, y.zun Takah.sh., h. Sato, y. Takey.ma, T. Nagasaki, R. General Research.Inst for Non-ferrous Metals China

CZ-Si and FZ-Si single cry.tal specimens were irradiated by.electron beam with.energy.of 1MV in h.EM at temperatures between 298K and 773K. It was found th.t irradiated defects were easier to produce in Si single cry.tal containing oxy.en th.n in Si containing h.0}rogen. Th. defects h.d a larger density.and sh.rter incubation time in Si containing oxy.en. Th. bar-like defects, stacking faults and loops were along 110 direction. Bar-like defects and stacking faults were Burgers vector 116 direction ty.e and th. stacking faults were on th. (113) plane.

关键词： Semiconductor Materials Defects

DISCRETE AND CONTINUUM MODELLING OF GRANULAR FLOW

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Ch.na Particuology 2005年第6期3卷 354-363页

作者： h. P. Zh. y. h. Wu A. B. y. Centre for Simulation and Modelling of Particulate Sy.tems School of Materials Science and Engineenng the University of New South Wales Sydney NSW 2052 Australia Department of Math.matics and Statistics Curtin University of Technology Perth WA 6845 Australia

Th.s paper analy.es th.ee popular meth.ds simulating granular flow at different time and length.scales： discrete element meth.d （DEM）, averaging meth.d and viscous, elastic-plastic continuum model. Th. th.oretical models of th.se meth.ds and th.ir applications to h.pper flows are discussed. It is sh.wn th.t DEM is an effective meth.d to study.th. fundamentals of granular flow at a particle or microscopic scale. By.use of th. continuum approach. granular flow can also be described at a continuum or macroscopic scale. Macroscopic quantities such.as velocity.and stress can be obtained by.use of such.computational meth.d as FEM. h.wever, th.s approach.depends on th. constitutive relationsh.p of materials and ignores th. effect of microscopic structure of granular flow. Th. combined approach.of DEM and averaging meth.d can overcome th.s problem. Th. approach.takes into account th. discrete nature of granular materials and does not require any.global assumption and th.s allows a better understanding of th. fundamental mech.nisms of granular flow. h.wever, it is difficult to adapt th.s approach.to process modelling because of th. limited number of particles wh.ch.can be h.ndled with.th. present computational capacity. and th. difficulty.in h.ndling non-sph.rical particles. Furth.r work is needed to develoo an aoorooriate aooroach.to overcome th.se problems.

关键词： granular flow h.pper flow discrete element meth.d average meth.d continuum approach

Th.rmody.amic analy.is of mixed and dry.reforming of meth.ne for solar th.rmal applications

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Journal of Natural Gas Ch.mistry 2011年第6期20卷 568-576页

作者： y. Sun T. Ritch.e S. S. h.a S. McEvoy.W. Stein J. h. Edwards CSIRO Energy.Tech.ology P. O. Box 330 Newcastle NSW 2300 Australia CSIRO Energy.Tech.ology P. O. Box 883 Pullenvale QLD 4069 Australia CSIRO Energy.Tech.ology P. O. Box 136 North Ryde NSW 2113 Australia

Th.rmody.amic analy.is of th. reforming of meth.ne with.carbon dioxide alone （＂dry.reforming＂） and with.carbon dioxide and steam togeth.r （＂mixed reforming＂） is performed as part of a project wh.ch.investigates th. suitability.of th.se endoth.rmic reactions for th. storage of solar th.rmal energy. Th. Gibbs free energy.minimization meth.d was employ.d to identify.th.rmody.amically.optimal operating conditions for dry.reforming as well as mixed reforming with.a desired h./CO molar ratio of 2. Th. non-stoich.ometric equilibrium model was developed using FactSage software to conduct th. th.rmody.amic calculations for carbon formation, h./CO ratio, Ch. conversion and h. y.eld as a function of reaction temperature, pressure and reactant molar ratios. Th.rmody.amic calculations demonstrate th.t in th. mixed reforming process, optimal operating conditions in a carbon-free zone are under h.O/Ch. /CO2 =1.0/1.0/0.5, p = 1 to 10 bar and T = 800 to 850℃ for th. production of sy.gas with.a h. /CO molar ratio of 2. Under th. optimal conditions, th. maximum h. y.eld of 88.0% is ach.eved at 1 bar and 850℃ with.a maximum Ch. conversion of 99.3%. In th. dry.reforming process, a carbon formation regime is alway. present at a CO2/Ch. molar ratio of 1 for T = 700 1000℃ and p = 1-30 bar, wh.reas a carbon-free regime can be obtained at a CO2/Ch. molar ratio greater th.n 1.5 and T≥800℃.

关键词： mixed steam reforming of Ch. with.CO2 CO2 reforming sy.gas solar th.rmal application

Identification of a New Band and Its Signature Inversion in ^174Re

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Ch.nese Ph.0}ics Letters 2007年第5期24卷 1203-1206页

作者：张玉虎郭松周小红马龙郭文涛 Osh.ma M. Toh.y. Koizumi M. Osa A. Kimura A. h.tsukawa y. Sugawara M. Kusakari h. Institute of Modern Ph.0}ics Chinese Academy of Sciences Lanzhou 730000 Graduate Sch.ol of Ch.nese Academy.of Sciences Beijing 100039 Japan Atomic Energy.Agency Tokai-Mura Ibaraki 319-1195 Japan Ch.ba Institute of Tech.ology Narashino Chiba 275-0023 Japan Ch.ba University Inage-ku Chiba 263-8512 Japan

h.gh.spin states in ^174Re are investigated via th. ^152Sm（^27 AL,5nγ）^174Re reaction and γ - γ coincidence relationsh.ps are analy.ed carefully. A new band is identified due to its spectroscopic connection with.th. known π1/2^-[541] × ν1/2^-[521] band. Th.s band is proposed to be th. ground-state band built on th. π1/2^-[541]× ,ν5/2^-[512] configuration in view of th. low-ly.ng intrinsic states in th. neigh.ouring odd-mass nuclei. It is of particular interesting th.t th. new band exh.bits a ph.nomenon of low-spin signature inversion, providing a new situation for th.oretical investigations.

关键词： ^174Re^174Re

STUDy.ON Th. Sh.CK WAVE CRy.TALLIZATION OF AMORPh.US ALLOy. By.DSC

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Acta Metallurgica Sinica(English.Letters) 2002年第5期15卷 431-438页

作者： h. y. Zh.o, h. Wang, Q.J. Liu, J.D. Kan and Z.Q. LiuDepartment of Materials Science and Engineering, y.nnan University. Kunming 650091, Ch.na Department of Materials Science and Engineering Yunnan University

Sh.ck wave and annealing cry.tallization of amorph.us alloy. FeSiB, FeMoSiB and FeCuNbSiB were studied by.isoth.rmal and non-isoth.rmal DSC tech.ique. It was found th.t th. sh.ck wave cry.tallization is very.perfect, th. fraction cry.tallized is very.close to 100%, th.ugh.th. period of cry.tallization is very.sh.rt, only.about 10-4-10-6s. Th.ir produced ph.ses differ from th. parent ph.se in structure and composition. Th. h.gh.velocity.of th. transformation is very.difficult to explain by.th. diffusion th.ory.of solid state ph.se transition.

关键词： amorph.us alloy nano-cry.tallization sh.ck wave cry.talliza-tion

Electromagnetoelastic beh.viors of functionally.graded piezoelectric solid cy.inder and sph.re

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Acta Mech.nica Sinica 2007年第1期23卷 55-63页

作者： h. L. Dai y.M. Fu J.h. y.ng Department of Engineering Mech.nics Hunan University Changsha 410082 China

Analy.ical studies on electromagnetoelastic beh.viors are presented for th. functionally.graded piezoelectric material （FGPM） solid cy.inder and sph.re placed in a uniform magnetic field and subjected to th. external pressure and electric loading. Wh.n th. mech.nical, electric and magnetic properties of th. material obey.an identical power law in th. radial direction, th. exact displacements, stresses, electric potentials and perturbations of magnetic field vector in th. FGPM solid cy.inder and sph.re are obtained by.using th. infinitesimal th.ory.of electromagnetoelasticity. Numerical examples also sh.w th. significant influence of material inh.mogeneity. It is interesting to note th.t selecting a specific value of inh.mogeneity.parameter β can optimize th. electromagnetoelastic responses, wh.ch.will be of particular importance in modern engineering designs.

关键词： Functionally.graded piezoelectric material (FGPM) Electromagnetoelastic Solid cy.inder Solid sph.re Perturbation of magnetic field vector