简介：为基于机制的紧张坡度粘性的常规理论的有限元素方法被用来学习缩进尺寸效果。为小缩排ers(例如，大概10μm的半径)，最大的许可的几何上必要的脱臼(接地)密度被介绍盖住GND密度以便后者不变得不现实联盟者高度。数字结果与铱的缩进坚硬数据同意很好。接地密度在indenter下面比统计上存储的脱臼(SSD)的密度大得多，但是这个趋势逆行离开indenter。作为缩进深度(或相等地，联系半径)增加，GND密度减少，但是SSD密度增加。

简介：Thegrowthandcoalescenceoftwomicroholesincopperfoilwerestudiedexperimentallybyinsitutensiletestsundera,scanningelectronicmicroscope.Twomicroholesof15-35μmindi-ameterwerearrangedindifferentdistancesandorientations.Itwasfoundthatthemechanismsofmicroholeevolutionwererepresentedbyslippingbandcreation,andthencrackinitiationandpropagationalongtheslippingbands,inligament.Theprocessofmicroholegrowthandcoalescencewasinfluencedbytheinter-centerdistanceandorientationofmicroholes.Thecriticalsurfaceofmicroholesatcoales-cenceisabout2—2.5timesthatoftheinitialone.Thevariationofboththeintercenterdistanceandorientationdependsontheinitialangle.

简介：Thenaturalfrequencies,complexmodesandcriticalspeedsofanaxiallymovingrectangularplate,whichispartiallyimmersedinafluidandsubjectedtoapretension,areinvestigated.Theeffectsoffreesurfacewaves,compressibilityandviscidityofthefluidareneglectedintheanalysis.Thesubsectionfunctionsareusedtodescribethediscontinuouscharacteristicsofthesystemduetopartialimmersion.Theclassicalthinplatetheoryisadoptedtoformulatetheequationsofmotionofavibratingplate.ThevelocitypotentialandBernoulli’sequationareusedtodescribethefluidpressureactingonthemovingplate.Theeffectoffluidonthevibrationsoftheplatemaybeequivalenttotheaddedmassontheplate.Theeffectsofdistanceratio,movingspeed,immersed-depthratio,boundaryconditions,stiffnessratioandaspectratiooftheplateaswellasthefluid-platedensityratiosonthefreevibrationsofthemovingplate-fluidsystemareinvestigated.

简介：这篇论文介绍一条新途径给连续统结构的结构的拓扑学优化。材料点独立变量被介绍在流行拓扑学优化方法说明材料点和他们的附近的存在条件，或不存在的东西而不是元素或节点。拓扑的变量地被少些在网孔被用作形状功能的动人的最不方形的近似构造方法。与有限元素分析，不是仅仅棋盘模式和网孔依赖现象结合了由这个连续、光滑的拓扑的变量领域，而且地点被克服，拓扑的变量的数字能是任意的。包括照点的数字的参数，可伸缩的参数，重量功能等等，在最佳之上，拓扑的配置被讨论。二个经典拓扑学优化问题被建议方法成功地解决。方法被发现柔韧，没有数字不稳定性与合适的参数被发现。

简介：TensileimpactexperimentsofEC8.0-24×7glassfiberbundlesatdifferentlowtempera-turesT（14℃,-40℃and-100℃）andstrainratesεwerecarriedout,andcompletestress-straincurveswereobtained.Withintherangeoftheexperimenttemperaturesandstrainrates,itisfoundthattheinitialmodulusE,theultimatestrengthσmaxandtheunstablestrainεboftheglassfiberbundlesallincreasewithatanidenticalT.Atanidenticalε,withthedecreaseofT,Eandσmaxincrease;butεbincreaseswhen14℃>T>-40℃anddecreaseswhen-40℃>T>-100℃.Thestrain-rate-andtemperature-depen-dentbimodalWeibullstatisticalconstitutivetheorywasadoptedforthestatisticalanalysisoftheexperimentalresults,andtheWeibullparametersofsinglefiberwereobtained.TheresultsshowthatthebimodalWeibulldistributionfunctionissuitabletorepresentthestrengthdistributionoftheglassfiberatlowtemperatureanddifferentstrainrates.ThedifferencesinthemechanicalpropertiesbetweenEC8.0-24×7andEC5.5-12×14glassfiberbundleswerealsodiscussed.

简介：Inthispaper,variousstrategiesofspiralirradiatingschemefortheflameformingofabowlshapedsurfaceareinvestigatedexperimentallyandnumerically.Experimentalworkisperformedusingaflametorchintegratedwitha2-axisCNCworkstation.TheABAQUSimplicitsolverisusedinthenumericalsimulation.Threedifferentstrategiesofthespiralirradiatingschemeareinvestigatedfortheflameformingofabowlshapedsurface.ThefirststrategyistheSimplespiralirradiatingscheme,thesecondistheRotationalspiralirradiatingscheme,andthethirdistheSymmetrical-Rotationalspiralirradiatingscheme.TheresultsshowthatusingtheSymmetricalRotationalspiralirradiatingscheme,abowlshapedsurfacewiththemaximumdeformationcanbeproduced,followedbyusingtheRotationalscheme,andtheSimplespiralscheme.ItisalsoconcludedfromtheresultsthatthespiralirradiatingschemewithSymmetrical-Rotational,RotationalandSimplespiralschemesleadtothemaximumsymmetriesintheproducedbowlshapedsurface,respectively.Allthenumericalresultsareingoodagreementwiththeexperimentalobservations.

简介：Byusingthefinite-partintegralconceptsandlimittechnique,thehypersingularinte-grodifferentialequationsofthree-dimensional(3D)planarinterfacecrackwereobtained;thenthedominant-partanalysisof2Dhypersingularintegralwasfurtherusedtoinvestigatethestressfieldsnearthecrackfronttheoretically,andtheaccurateformulaewereobtainedforthesingularstressfieldsandthecomplexstressintensityfactors.Afterthat,anumericalmethodisproposedtosolvethehyper-singularintegrodifferentialequationsof3Dplanarinterfacecrack,andtheproblemofellipticalplanarcrackisthenconsideredtoshowtheapplicationofthemethod.Thenumericalresultsobtainedaresat-isfactory.

简介：Equilibriumpathsofpost-bucklingaremeasuredforlargeslendernesscolumnspecimensmadeofthefiberreinforcedcompositematerial.Theinfluenceoftheinitialcurvatureisinvestigatedexperimentallyandcomparedwiththeresultoftheinitialpost-bucklingtheory.Boththetheoreticalandexperimentalresultsrevealthatthecolumnwiththeinitialcurvaturehasstablepost-bucklingbe-haviorsandisnotsensitivetotheimperfectionintheformofinitialcurvature.Theexperimentalre-sultsshowthatwhenthelateralbucklingdisplacementislessthan20percentofthecolumnlength,theexperimentalresultsagreewiththeresultsfromthetheoryofinitialpost-bucklingquitewell,whiletheyagreewiththeresultsfromthelargedeflectiontheoryinaquitelargerange.

简介：在射弹影响下面的结束大头针的横梁的违反直觉的行为在这篇论文与ANSYS/LS-DYNA被调查。它详细学习theirdisplacement时间历史曲线，最后的使变形的形状，精力关系和射弹影响与他们的违反直觉的行为有关的速度范围。他们的违反直觉的行为上的影响位置的影响也被讨论。结果显示出那不管横梁上的影响位置在哪儿，只要影响速度躺在一个合适的范围以内，卡住的横梁的违反直觉的行为将发生。相应于thecounter直觉的行为发生，在横梁的排水量历史曲线的反弹的数字随影响速度的增加从一些时间减少到零。相应于违反直觉的行为的横梁的最后的变丑模式将出现在对称的andunsym韵律的形式不管影响位置在哪儿；横梁的违反直觉的行为的发生thefirst的影响速度与影响位置的偏差慢慢地增加离开中间跨度。

简介：Anin-depthanalysisofpropagationcharacteristicsofelasto-plasticcombinedstresswavesincircularthin-walledtubeshasbeenmade.Inobtainingthesimple-wavesolution,however,mostresearcheshaveignoredtheinfluenceofthecircumferentialstressrelatedtotheradialinertialeffectinthetubes.Inthispapertheincrementalelasto-plasticconstitutiverelationswhichareconvenientfordynamicnumericalanalysisareadopted,andthefinite-differencemethodisusedtostudytheevolutionandpropagationofelasto-plasticcombinedstresswavesinathin-walledtubewiththeradialinertialeffectofthetubeconsidered.Thecalculationresultsarecomparedwiththoseobtainedwhentheradialinertialeffectisnotconsidered.Thecalculationresultsshowthattheradialinertialeffectofatubehasafairlygreatinfluenceonthepropagationofelasto-plasticcombinedstresswaves.

简介：Inthispaper,thefractureprocessofaunidirectionalCF/SiCsingleedge-notchedbeam(SENB)underthree-pointbending(TPB)isstudiedbymeansofmacro/micro-statisticalMonteCarlosimulation.Thesimulatedp-△curvesareinagreementwiththeexperimentalresultsbeforethepeaksofcurves,andthesimulatedmicroevolutionpatternsareinagreementwiththepatternsofthecracksurfaces,whichhaveverifiedthismethod.ItispreliminarilydemonstratedthatthesecondturningpointinthecompliancechangingratecurvecorrespondstothefractureinitiationforexperimentsonSENBunderTPBofunidirectionalCF/SiCcomposites.