简介:Inthispaperthemodernelectron-opticalequipmentisusedtotranslatetheclearimageofspeed-movingbubblesinbubblingliquidonasievetrayintothedigitalinformationstoredincomputer,andthecomputeraidedimage-processingtechniqueisutillizedtomeasurethebubblesizedistributionsandinterfacialareasundervariousoperatingcondtions.Andthedynamicbehaviorofbubblesintrubulentliquidisanalyzedtheoretically;themechnaismofbubbledeformationandbreakageisexploredonthebasisofKolmogorff'sisotropicturbulencehypothesis;themathematicalmodelforpredictingthegas-liquidinterfacialareaisproposed,Thecomparisonbetweenthesimulatedresultsandtheexperimentaldatashowthatthemodelishigherinaccuracy,simpleinformandconvenientinuse.
简介:Theinterfacialbehaviorofpipejointsisstudiedinthispaper.Firstly,throughnonlinearfracturemechanics,theanalyticalexpressionsofinterfacialshearstressandtheloaddisplacementrelationshipatloadedendofpipejointsundertorsionloadsareobtained.Thustheshearstresspropagationandthedebondingprocessofthewholeinterfacefordifferentbondlengthscanbepredicted.Secondly,throughtheanalyticalsolutions,theinfluencesofdifferentbondlengthsontheload-displacementcurveandtheultimateloadarestudied.Thestresstransfermechanism,theinterfacecrackpropagationandtheductilitybehaviorofthejointscanbeexplained.
简介:Ta/MgO/NiFe/MgO/TaultrathinfilmswithandwithoutintercalationofNiFenanoparticlesinMgOlayerswerepreparedbymagnetronsputtering,followedbyavacuumannealingprocess.Themeasuredandcalculatedresultsshowthattheformerhashigherspecularelectronscattering(SES)parameteratMgO/NiFeinterfaces,lowerresistivity,andhighermagnetoresistance(MR).Theimprovedtransportproperties(TPs)aremainlyattributedtothesuppresseddiffuseelectronscatteringbymeansoftheintroductionofNiFenanoparticles.
简介:Determiningtheinterfacialpropertiesofthermalbarriercoatings(TBCs)isimperativefortheirdurabilityevaluationandfurtherimprovements.Aceramiccoating(topcoat)andaNiCoCrALYbondcoatwereatmospheric-plasma-sprayed(APS)onastainlesssteelsubstrate.Amodifiedthree-pointbendingtestwasadoptedtoinitiateandpropagatethetopcoat/bondcoat(TC/BC)interfacialcrack.Afteracompletedelamination,thefracturesurfaceswereexaminedbyanopticalmicroscope,whichshowsthatthecrackingplanewasmerelyontheTC/BCinterface.Basedontheexperimentalresultsofload–displacementandcracklength–displacement,thestrainenergyreleaserateGforcrackpropagationwascalculated,andtheaveragedmagnitudewas77.1J/m2.Repeatableresultshaveindicatedthatthemethodcanbeusedfortheevaluationofinterfacialfracturetoughnessinthermalbarriercoatingsandothermulti-layerstructures.
简介:在这篇文章,有关表面和界面的紧张的试验性的大小跟随简短介绍,为为二进制代码计算表面紧张和表面分离的方法,第三,并且多部件高温度基于蝇绳融化“soriginal处理并且在可得到的物理性质和热力学的数据上,特别体积阶段和表面阶段对温度的免费精力从热力学的数据库获得了使用相图(CALPHAD)的计算的excessGibbs来临,与到模型参数β的特殊注意,被描述了。另外,几何模型能被扩大预言表面紧张多亚二进制代码系统的从那些的部件系统。在nanoparticle系统的二元合金的Forillustration,一些计算例子,包括的Pb免费的焊接系统和phase-diagramevaluation被给。根据紧张ofhigh温度融化的表面,在象moltens一样的液体合金和熔融的炉渣之间的界面的紧张落后,熔融的物质能用Girifalco好的方程是计算的。修正在Nishizawa被建议“为在液体金属(A)/ceramics(MX)的界面的紧张的评价的s模型系统以便计算能基于潜水艇晶格模型和热力学的数据被执行,没有故意在高温度区分MX的阶段。最后,为预言在thehigh温度多部件之间的界面的紧张的一个近似表达式的推导融化,雇用贝克尔“与蝇绳一起的s模型”sequation和简单系统的界面的紧张数据被描述,并且有关焦性没食子酸的一些例子冶金系统为更好理解被给。
简介:Thisstudyconcernsatwo-dimensionalmodelandthecorrespondingvirtualcrackclosuretechnique(VCCT)implementedtosolvethegeneralboundaryvalueproblemsthatmayexplainwhyinterfacediscontinuityhaseffectsonthefracturebehaviorinthesuperconductor-substratesystem.Theinterfacialdiscontinuitycanbeclassifiedaccordingtothematerialproperties'continuityandtheirderivatives'continuityattheinterface.Fornonhomogeneoussuperconductorandsubstratespecimenswithvariousmaterialproperties,aVCCTmethodisdevelopedtocalculatetheirfracturebehavior.Furthermore,theeffectsofappliedmagneticfieldamplitudeandnonhomogeneousparametersareextensivelyandparametricallystudiedintwoactivationprocesses(zero-fieldcoolingandfieldcooling).Theintegrativeandcomputationalstudypresentedhereprovideafundamentalmechanisticunderstandingofthefracturemechanisminthesuperconductor-substratesystemandshedslightontherationaldesignofinterfacialcontinuity.
简介:Thebondingofsteelplatetoaluminumliquidwasconductedusingrapidsolidification.Theinfluenceofdiffusiontimeoninterfacialstructurewasstudied.Theresultsshowedthatundertheconditionof750℃forthetemperatureofaluminumliquidand200℃forthepreheattemperatureofsteelplate,whendiffusiontimewasshorterthan4.3s,therewasonlyFe-Alsolidsolutionattheinterface.Whendiffusiontimewaslongerthan4.3s,Fe-Alcompoundbegantoformattheinterface.TherelationshipsbetweendiffusiontimetandthicknessofFe-AlcompoundlayerHareH=-9.72+2.62t-0.08t^2(4.3s≤t≤15s)andH=2.79+0.647t=0.033t^2(t>15s).
简介:在给定的静电干扰并且动态轴的装载下面的一个precracked双性人材料结构接口的行为是在现在的纸的一个兴趣目标。第一,砍落后模型是一个合适的工具在经历静态的装载的precracked双性人材料结构分析一个分层过程,这被显示出。第二,砍落后模型在动态装载下面被用于结构。为结构的接口分层解决这个问题并且沿着接口决定debond长度,我们的自己的2D边界元素方法(BEM)代码在静态的装载的情况中被建议,并且和Laplace变换和一半分析的计算的砍落后模型在动态装载的情况中被使用。接口层与其它相比作为一个很薄的盘子被假定二。参量(几何、有弹性)debond长度和接口的分析砍应力被做。从2DBEM代码的结果证明了砍落后模型的分析答案的有效性。在动态盒子中,装载特征的影响,即,shear压力和为时间的间隔的debond长度的价值上的频率和振幅变化,被讨论。获得的结果的分析被一个例子说明现代陶器金属合成,也就是金属陶瓷,并且在图描绘了。
简介:Theeffectsofinterfacialmodifieronthemechanicalpropertiesofkaolin-filledpolyamide6(PA6)havebeenstudied.Theinterracialinteractionbetweenpolyamide6andkaolinhasbeencharacterizedbymeansofinfraredspectroscopy(IR)andscanningelectronmicroscopy(SEM).TheresultsshowthattheroleoftheinterracialmodifierliesinforminganelasticinterlayerwithgoodadhesionbetweenkaolinandPA6.Acompositewithhighimpactstrength,hightensilestrengthandhighelasticmoduluscanbeobtainedbyinsertingtheelasticinterfacialmodifierintotherigid-particle-filledpolymersystem.
简介:Themechanicalperformanceofcarbonnanotube(CNT)reinforcedpolymercompositesisprimarilycontrolledbythedispersivecapacityandinterfacialshearstrengthofCNTsinpolymermatrices.CNTfunctionalizationswillimprovedispersionandstrengtheninterfacialbondingofCNTsinmatrices.TounderstandtheeffectsofdifferentfunctionalizationschemesontheinterfacialstrengthofCNT-polymercomposites,pulloutofthecovalent,noncovalent,andmixedfunctionalizedsingle-walledcarbonnanotube(SWCNT)frompolyethylene(PE)matrixwassimulatedbyusingmoleculardynamics,respectively.TheresultsshowthattheSWCNT-PEinterfacialshearstrengthissignificantlyimprovedbySWCNTfunctionalizations,particularlybymixedfunctionalization.
简介:Thefailuremodeandadhesionofthermalbarriercoating(TBC)8YSZ(ZrO2+8%(w/w)Y2O3)depositedonNiCoCrAlTaYbondcoatbyatmosphericplasmasprayingwereinvestigated.Agroovedmodifiedthree-pointbendingspecimenthatcangenerateasingleinterfacecracktofacilitatethecontrolofcrackgrowthwasadoptedfortesting,whichwasconductedattheambienttemperatureof100°C.Themorphologyandcompositionoffracturedsurfaceswereexaminedbymeansofascanningelectronmicroscopy(SEM)andanenergydispersespectroscopy(EDS).ImagesandspectrumshowthatcracksareinitiatedandpropagatedexclusivelywithinYSZlayeradjacenttotop/bondcoatinterface.Theload-displacementcurvesobtainedexhibitsimilarshapesthatindicatetwodistinctstagesincrackinitiationandstablecrackgrowth.FiniteelementanalyseswereperformedtoextracttheadhesionstrengthoftheTBCs.Thedelaminationtoughnessoftheplasma-sprayed8YSZcoatingsat100°C,intermsofcriticalstrainenergyreleaserateGc,canbereliablyobtainedfromananalyticalsolution.
简介:由于它的突出的电子性质,黑磷(BP)为下一代的optoelectronic设备被看作有希望的材料。在这个工作,设备基于BP/MXene(Zrn+1CnT2,T=O,F,哦,n=1,2)货车derWaals(vdW)heterostructures经由第一原则的计算被设计。Zrn+1Cn有适当工作功能的T2作文在垂直方向导致与BP的欧姆的接触的形成。低Schottky障碍在BP/Zr2CF2,BP/Zr2公司2H2,BP/Zr3C2F2,和BP/Zr3C2O2H2bilayers,并且BP/Zr3C2O2甚至展出欧姆的接触行为。BP/Zr2公司2是有type-II乐队排列的半导体的heterostructure,它便于电子洞对的分离。BP/Zr2公司2能有效地经由一个垂直电场被调节,并且BP被预言在0.4V/电场从施主经历转变到领受人。在这个工作检验的BP/MXeneheterostructures的万用的电子性质在电子学为应用加亮他们的有希望的潜力。
简介:WehavestudiedtheinterfacialstructuresofAlN/Si(111)grownbymetal-organicchemicalvapourdeposition.X-rayphotoelectronspectroscopyandAngerelectronspectroscopywereusedtoanalysethecomponentsandchemicalstructuresofAlN/Si(111).Theresultsindicatedthatamix-crystaltransitionregion,approximately12nm,waspresentbetweentheAlNfilmandtheSisubstrateanditwascomposedofAlNandSi3N4.AfteranalysiswefoundthattheexistenceofSi3N4couldnotbeavoidedintheAlN/Si(111)interfacebecauseofstrongdiffusionat1070℃.EveninAlNlayerSi-Nbonds,Si-Sibondscanbefound.
简介:由考虑界面的损坏并且用变化原则的效果,有界面的损坏的把压成薄片的盘子的三维的非线性的动态管理方程向精确压力分析基于一般six-degrees-of-freedom塔板理论被导出。为有界面的损坏的一个简单地支持的把压成薄片的盘子的interlaminar应力和非线性的动态反应的答案被使用有限差别方法获得,并且结果被比较与非线性的有限元素方法的答案验证。在数字计算,在接口和把压成薄片的盘子的非线性的动态反应的压力上的界面的损坏的效果被讨论。
简介:Diamond/Cu-xCrcomposites被压力渗入过程制作。diamond/Cu-xCr的热传导性(x=0.1,0.5,0.8)composites在650W/mK上面,比diamond/Cucomposites的高。张力的力量从186~225MPa,并且结合的力量从400~525MPa。thermo物理的性质和接口结构上的Cr元素的影响被分析。当Cr3C2和Cr3C2的数量随Cu-xCr合金的Cr集中的增加增加了,中间的层被证实。当Cr集中直到0.5wt.%时,Cr3C2层的内容是不变的。当Cr3C2层的厚度变得更大,composites显示出更低的热传导性但是更高机械的性质。diamond/Cu-xCr的热扩大(CTE)的系数(x=0.1,0.5,0.8)composites在对Kerner模型的预言的好同意。