简介:这研究的目的是评估本地人爬象粗糙的颗粒的热那样的各种各样的微观结构的损坏影响了地区(CGHAZ),精细的热影响了地区(FGHAZ),intercritical热影响了作为类型IV区域知道的地区(ICHAZ),焊接金属,并且由小穿孔机(SP)基于P92(9Cr-2W)钢焊接的金属爬在600掳C的测试。另外,焊接分开决定最弱的本地人,微观结构在上的效果爬在P92钢的焊接的破裂行为被学习。从试验性的结果,FGHAZ和类型IV区域结果是P92焊接的很弱的本地部分。特别,TYPEIV区域显示出最大的排水量率并且与许多过了最短的破裂生活爬洞广泛地在大多数这个区域传播了。
简介:理论分析和有限元素(FE)模拟为经常的特定的负担率(CSLR)被执行了缩进爬测试。分析结果显示代表性的压力和缩进紧张在一个短暂时期以后评估变得的常数。而且,FE模拟两个都揭示那相等的应力的轮廓和在indenter下面的相等的塑料紧张率与几何自我类似演变。这建议伪steady缩进爬在indenter下面发生在这个区域。在这个区域的代表性的点与相等的压力平等者被定义为到代表性的压力。另外,在缩进紧张率和相等的塑料紧张之间的比例在伪steady缩进期间在代表性的点评估抓住,这被揭示幂定律材料爬。在indenter下面的控制卷(CV)管理indenter速度,被识别。在缩排的表面的CV的尺寸是印象的约2.5倍大小。压力代表为爬能从伪steady缩进被获得爬数据。这些结果证明CSLR严峻的技术能被用来评估爬有一样的精确性作为的参数常规单轴爬测试。
简介:Mullite-corundumbricksandkilnfurni-turewithhighcreepresistanceandgoodthermalshockresistancewerefabricatedbasedonlowcostrawmaterials,theapproachesofintroducingsomeadditivesandoptimisig,chemicalcompositionandparticalsizeweremployedtoproduceahightemperaturematrixphasewithhighcreepresistanceandgoodthermalshockresistance.
简介:张力爬精细的Fe-Mn二进制合金containing0.42-1.21wt.%Mn的行为从房间温度在温度范围被调查了到475Kunder10-50MPa。张力的测试以紧张率在uniaxail负担下面以经常的小标题速度被执行10(-4)s(-1)。压力代表和激活精力决心澄清变丑机制。稳定的状态的获得的变化爬关于为Fe-Mn二进制合金的应用压力的率在大约20MPa展出二不同政体,显示一个可能的变化在爬机制。平均压力代表是约2.2,它是在合金滑动的谷物boundry的一个特征。为塑料流动的激活精力从135~92kJ/mol变化,取决于Mn内容。
简介:Previousconstitutivemodelsofgraniteshearcreephavetwolimitations:(1)althoughmoisturegreatlyaffectsgraniteshearcreepbehavior,currentlytherearenoconstitutivemodelsthatincludethisfactor;(2)therearealsonomodelsthatincludeanaccelerationstage.ThispaperpresentsanimprovedBurgersconstitutivemodelwiththeadditionofadamageparametertocharacterizethemoistureeffectandusesanonlinearrelationequationbetweenstressandstrainforinclusionastheaccelerationstage.Thedamageparameterisdeterminedfromgranitecreepexperimentunderfourdifferentmoisturecontents(0%,0.22%,0.49%,and0.79%).Thenonlinearrelationequationisobtainedbyfittingadatasetofstainversustimeunderfivedifferentloadingstages.Toverifythepresentedmodel,acreepexperimentwasconductedonothergranitesamplesandtheresultsshowthatthemodelagreeswellwiththeexperimentalobservationdata.
简介:Low-creepratebrickH1SSandH2SShavebeenstudiedinLuoyangRefractoriesCo.,Ltd.onthebasisofformerresultsusingdifferentgradesyntheticmulliteandnaturalsillimaniteconcen-trate,Goodmicrostructureandhightemperaturepropertiescanbeobtainedbyusinghighqualityrawmaterialandreasonableproportioningandtechnology.ThecreepvaluesofH1SSandH2SSarelesshan0.5%at1400℃and0.45%at1350℃。
简介:Inthispaperthemethodofdamagemeasurementofmetalstructureatthecreepisproposed.Incontrasttoothermethods,itallowsthemeasurementofthisdamagetobecarriedoutintheprocessofcreeptestwithoutunloadingandcoolingofspecimens.Experimentaldamagecurvesduringcreepareobtainedasaresultoftestdataprocessingbythesuggestedmethod.Theanalysisofthesecurvesleadstoaconclusionthatthematerialdamageatreptureismonotonicallydecreasingfunctionoftheappliedstress.Thisconclusionisanexperimentalverificationofthetheoreticalresult,obtainedearlier.
简介:Asystematicalsimulationhasbeencarriedoutontheindentationcreeptestonparticle-reinforcedcomposites.Thedeformation,failuremechanismsandlifeareanalyzedbythreereasonablemodels.Thefollowingfivefactorshavebeenconsideredsimultaneously:creeppropertyoftheparticle,creeppropertyofthematrix,theshapeoftheparticle,thevolumefractionoftheparticleandthesize(relativesizetotheparticle)oftheindentationindenter.Forallthecases,thepowerlawrespectingtotheappliedstresscanbeusedtomodelthesteadyindentationcreepdepthrateoftheindenter,andthedetailexpressionshavebeenpresented.Thecomputersimulationprecisionisanalyzedbythetwo-phasemodelandthethree-phasemodel.Twoplacesofthestressconcentrationarefoundinthecomposites.Oneisaheadoftheindentationindenter,wherethehighstressstateisdeducedbytheedgeoftheindenterandwilldecreaserapidlyneartoasteadyvaluewiththecreeptime.Theotheroneisattheinterface,wherethehighstressstateisdeducedbythemisfitofmaterialpropertiesbetweentheparticlesandmatrix.Ithasbeenfoundthatthecreepdissipationenergydensityotherthanastressparametercanbeusedtobethecriteriontomodelthedebondingoftheinterfaces.Withthecriterionofthecriticalcreepdissipationenergydensity,apowerlawtotheappliedstresswithnegativeexponentcanbeusedtomodelthefailurelifededucedbythedebondingofinterfaces.Theinfluencesoftheshapeoftheparticlesandthematchingofcreeppropertiesofparticleandmatrixcanbediscussedforthefailure.Withacrackmodel,thefurthergrowthofinterfacecrackisanalyzed,andsomeimportantexperimentalphenomenacanbepredicted.Thefailuremechanismwhichtheparticlewillbepunchedintomatrixhasbeenalsodiscussed.Thecriticaldiflerencesbetweenthecreeppropertiesoftheparticlesandmatrixhavebeencalculated,afteraparameterhasbeendefined.Intheviewofcompetitionoffailure
简介:Thecreepeffectofsuspensionsinelectro-dynamicloudspeakerswasmodeledbasedonfractionalorderderivatives.Thefractionalstandardlinearsolid(FSLS)modelwaspresentedbysubstitutingtheAbeldashpotforNewtondashpotinStandardLinearSolid(SLS)model.TheelectricalimpedanceaswellasthetransferfunctionbetweendiaphragmdisplacementandinputvoltageofthetwotestedmidrangeloudspeakerswasmeasuredbyKlippellaseranalyzersystem,andthemodelparameterswereidentifiedbytheleast-mean-squaremethod.BycomparingthefittingresultsofFSLSmodelwiththeothertwoclassicalmodels-4ParameterLogarithmicmodelandSLSmodel,theresultsshowthattheFSLSmodelcanrightlypredictthefrequencydependentcompliancelossfactorandyieldhigheraccuracyformodelingthecreepeffectinloudspeakersuspensions.
简介:Thedensityofasphaltwasmeasuredwiththepycnometeranddensitometer.Creeppropertiesoftheasphaltwereinvestigatedwiththebendingbeamrheometerattemperaturesrangingfrom0℃to-36℃.Theasphaltdensitydatausedtocorrelatewiththecreeppropertieswerecalculatedfromtheregressionequationofdensityandtemperature.TheasphaltsampleusedtodeterminethecreeppropertywasagedbythestandardRTFOTtestandthePAVtest.Thetestresultsshowedthattheasphaltdensityhadalinearrelationshipwithtemperaturechanges.Thelogarithmofthecreepstiffnessandtheslopeofthelogarithmofthestiffnessat60secondsalldemonstratedalinearrelationshipwiththedensity,andtheregressioncoefficientofthesedatawasaround0.99.Thecreepstiffnessandtheslopeofthecreepstiffnesscanbecalculatedfromtheasphaltdensityatthesametemperature.
简介:Thispaperintroducesofthedevelopmentandapplica-tionofheavilyburnedmullitedbrickwithhighreractorinessunderloadlowcreep,whichismadeofandalusiefineandcoarsegrains(asaggregate),highaluminabauxiteproducedinYangquancounty,clayproducedinGuangxiprovine,industrialaluminapowderandsilliman-itepowder(asmatrixmaterial)andalittleamountofad-ditivesandbondedwithsyntheticbond.
简介:Inordertopredictthemechanicalperformanceofthepolyvinylchloride(PVC)atahighoperatingtemperature,aseriesofshort-termtensilecreeptests(onetenthofthephysicalagingtime)ofthePVCarecarriedoutat63Cwithasmallconstantstressbyadynamicmechanicalanalyzer(DMA).TheStruik-Kohlrausch(SK)formulaandStruikshiftingmethodsareusedtodescribethesecreepdataforvariousphysicalagingtime.AnewphenomenologicalmodelbasedonthemultiplerelaxationmechanismsofanamorphouspolymerisdevelopedtoquantitativelycharacterizetheSKparameters(theinitialcreepcompliance,thecharacteristicretardationtime,andtheshapefactor)determinedbytheagingtime.ItisshownthatthemomentarycreepcompliancecurveofthePVCat63CcanbeverywellfittedbytheSKformulaforeachagingtime.However,theSKparametersforthecreepcurvesarenotconstantduringtheagingprocessattheelevatedtemperatures,andtheevolutionoftheseparametersandthecreeprateversusagingtimecurvesatthedoublelogarithmiccoordinateshaveshownanonlinearphenomenon.Moreover,thecreepmastercurvesobtainedbythesuperpositionwiththeStruikshiftingmethodsareunsatisfactoryinsuchacase.Finally,thepredictedresultscalculatedfromthepresentmodelincorporatingwiththeSKformulaareinexcellentagreementwiththecreepexperimentaldataforthePVCisothermallyagedatthetemperaturerelativelyclosetotheglasstransitiontemperature.
简介:英雄作为魔兽争霸3中新引入的单位,其重要性已为玩家熟知,因而英雄的升级及所持物品的选择也成为必须考虑的问题之一,CreepHunting自然也成为支持英雄的强力后盾。因此,我们将现在流行的CreepHunting技巧及自己的经验进行总结归纳,希望能对大家有所帮助。