简介：Thispaperstudiesthechemicalcomposition,tensileproperties,inclusions,metallogrophicstructure,andothersuchparameterstoidentifythecausesofcrackingduringthebendingofhigh-strengthsteel.Theresultsshowthatthemajorcausesofcrackingaretheoriginaltransversecracksorholesonthesurfaceoftheslabandthepresenceofscalesrolledintothecracksorholes.Coldfracturingfromsuchdefectsisrare,andcanbeeleminatedbyenhancingthecontrolofthesteelmakingprocessandbymechanicalclean-upofthesurfacecracksandholesintheslab.

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简介：Thereliabilityofsteelweldsbecomesmorecriticalissuewithincreasingsteelstrength,becausebrittlephasesaremorelikelytoformintheweldmetalsandheat-affectedzone(HAZ)andtherebythetoughnessandductilityoftheweldsaredegraded.Therefore,refinementofmicrostructureandminimizationofthebrittlephasesarenecessarytoimprovethereliabilityofthehigh-strengthsteelwelds.Inthispresentation,microstructureformationthatcontrolsthetoughnessofweldmetalsandHAZinhigh-strengthlow-alloy(HSLA)steelweldsisreviewedandpossibleroutestotheimprovementoftheweldmicrostructureandweldtoughnessarediscussed.

简介：Themechanicalperformanceofcarbonnanotube(CNT)reinforcedpolymercompositesisprimarilycontrolledbythedispersivecapacityandinterfacialshearstrengthofCNTsinpolymermatrices.CNTfunctionalizationswillimprovedispersionandstrengtheninterfacialbondingofCNTsinmatrices.TounderstandtheeffectsofdifferentfunctionalizationschemesontheinterfacialstrengthofCNT-polymercomposites,pulloutofthecovalent,noncovalent,andmixedfunctionalizedsingle-walledcarbonnanotube(SWCNT)frompolyethylene(PE)matrixwassimulatedbyusingmoleculardynamics,respectively.TheresultsshowthattheSWCNT-PEinterfacialshearstrengthissignificantlyimprovedbySWCNTfunctionalizations,particularlybymixedfunctionalization.

简介：Inthisstudy,a600MPahot-rolledcorrosion-resistantsteelplateproducedbyaspecificcompanyisinvestigated.Edgejaggeddefectsandedgesurfacedefectsgeneratedonbothsidesofthestripduringproductionarecharacterizedandanalyzed.Theresultsindicatethatthedistributionofreoxidationgranulesislocatedunderneaththesurfacepeelandthatcopper-containinggranulesdiffusealongaustenitegrainboundaries.Thisphenomenoncombinedwiththechemicalcompositionandproductionparametersofastripindicatethatcopperbrittlenessleadstoedgejaggeddefects.However,thesurfacedefectsshouldbeattributedtoinherentdefectsonthesurfaceofthestrip.Measuresthatpreventsurfaceoxidationandcoppersegregationatgrainboundarieswouldlikelyeliminatethesetwotypesofedgedefects.

简介：ThehotrollingexperimentinvestigatesintotherelationshipbetweenthemicrostructuresandthemechanicalpropertiesofNb-TimicroalloyedsteelswithvariousTicontents.TheresultsindicatethattheeffectofthebainitefractionofNb-TimicroalloyedsteelsontheyieldstrengthofthesteelsisnotrelatedtoTicontent,whiletheslopeoftheHall-PetchrelationshipdecreaseswiththeincreaseofTicontent.Accordingly,theMisramodelfortheyieldstrengthofNb-Timicroalloyedsteelsismodified,andthefactorswhichcausethechangeintheslopeofHall-Petchrelationshiparediscussed.

简介：Theearthquake-resistantpropertyofreinforcedconcretemembersdependsontheinteractionbetweenreinforcingbarsandsurroundingconcretethroughbondtoalargedegree.Inthispaperageneralsystemaimedatdealingwiththefailureanalysisofreinforcedconcretecolumnsstrengthenedwithcarbon-fiber-reinforcedplastic(CFRP)sheetsincludingbond-slipoftheanchoredreinforcingbarsatthefootofthecolumnsispresented.Itisbasedontheyielddesigntheorywithamixedmodelingofthestructure,accordingtowhichtheconcretematerialistreatedasaclassicaltwo-dimensionalcontinuum,whereasthelongitudinalreinforcingbarsareregardedasone-dimensionalrodsincludingbond-slipatthefootofthecolumns.InshearreinforcedzonesboththeshearCFRPsheetsandtransversereinforcingbarsareincorporatedintheanalysisthroughahomogenizationprocedureandtheyareonlyintension.Theapproachisthenimplementednumericallybymeansofthefinite-elementformulation.Thenumericalprocedureproducesaccurateestimatesfortheloading-carryingcapacityoftheshearmemberstakenasanillustrativeapplicationbycorrelationwiththeexperimentalresults,sotheproposedapproachisvalid.

简介：Areasonablestrengthcriterionshouldreflectthehydrostaticpressureeffect,minimumprincipalstresseffect,andintermediateprincipalstresseffect.Theformertwoeffectscanbedescribedbythemeridiancurves,andthelastonemainlydependsontheLodeangledependencefunction.Amongthreeconventionalstrengthcriteria,i.e.Mohr–Coulomb(MC),Hoek–Brown(HB),andExponent(EP)criteria,thedifferencebetweengeneralizedcompressionandextensionstrengthofEPcriterionexperienceafirstlyincreasethendecreaseprocess,andtendstobezerowhenhydrostaticpressureisbigenough.Thisisinaccordancewithintrinsicrockstrengthcharacterization.Moreover,thecriticalhydrostaticpressureIccorrespondingtothemaximumdifferenceofbetweengeneralizedcompressionandextensionstrengthcanbeeasilyadjustedbyminimumprincipalstressinfluenceparameterK.So,theexponentfunctionisamorereasonablemeridiancurves,whichwellreflectsthehydrostaticpressureeffectandisemployedtodescribethegeneralizedcompressionandextensionstrength.Meanwhile,threeLodeangledependencefunctionsofLMN,LWW,andLYMH,whichunconditionallysatisfytheconvexityanddifferentialrequirements,areemployedtorepresenttheintermediateprincipalstresseffect.Realizingtheactualstrengthsurfaceshouldbelocatedbetweenthegeneralizedcompressionandextensionsurface,newtrue-triaxialcriteriaareproposedbycombiningthetwostatesofEPcriterionbyLodeangledependencefunctionwithasamelodeangle.Theproposednewtrue-triaxialcriteriahavethesamestrengthparametersasEPcriterion.Finally,14groupsoftriaxialtestdataareemployedtovalidatetheproposedcriteria.Theresultsshowthatthethreenewtrue-triaxialexponentcriteria,especiallytheExponentWillam-Warnkecriterion(EPWW)criterion,givemuchlowermisfits,whichillustratesthattheEPcriterionandLWWhavemorereasonablemeridiananddeviatoricfunctionform,respectively.Theproposednewtrue-tria

简介：ThenanostructuredAl-basedcompositespossessthecombinationofhighyieldstrengthandgoodductility.Inthispaper,amicromechanicalmodelispresentedtosimulatethemechanicalresponseofbimodalnanostructuredAlandtheparticle-reinforcedaluminummatrixcomposite(PAMC).Theconstitutiverelationsfordifferentphasesareaddressedinthemodel,aswellasthecontributionofmicrocracks.NumericalresultsshowthatthemodelcansuccessfullydescribetheenhancedstrengthandductilityofthebimodalnanostructuredAl,andthepredictionsofthePAMCareingoodagreementwiththeexperimentaldata.ItisworthnotingthatthestrengthandductilityaresensitivetothevolumefractionofconstituentsandthedistributionofmicrocracksinbothbimodalnanostructuredAlandPAMC.Therefore,thepresenttheoreticalresultscanbeusedtooptimizethemicrostructureforimprovingthemechanicalpropertiesofnanostructuredAl-basedcomposites.

简介：与一个简单索引定义东方亚洲冬季季风(EAWM)的紧张是一项困难的任务。这份报纸在18存在EAWM力量索引的意思上详细描述并且分类他们进四个范畴：低级的风索引，上面的带的风砍索引，东方西方压力对比索引，和东方亚洲人马槽索引。索引当时是的这些的时间/空间的表演和预言潜力为1957鈥?分析了001时期。它表明在十的timescale上，除了东方西方压力的大多数索引对比索引能很好捕获在1986附近的EAWM的连续变弱。在interannualtimescale上，低级的风索引和东方亚洲马槽索引基于ElNi的知识有最好的可预测性?o南部的摆动和北极摆动分别地。所有18个存在索引能很好描述EAWM相关的发行量，降水，和更低的tropospheric空气温度异例。然而，在华中的大区域上的表面空气温度的变化不能与地志的效果有关可能是大多数索引捕获的井，它是。这研究的结果可以为EAWM的未来研究提供一本可能的参考书。关键词东方亚洲冬季季风索引-interannual变化-interdecadal变化

简介：关于mesomechanics的一个新方法有限元素的研究被建议预言山峰砍mesoscopic上的材料放大的mudded置闰的力量。基于几何、机械的参数，与样品获得的种类失败标准一起变丑特征，样品上的单轴的压缩测试通过一个有限元素的模型被模仿，它从单轴的压缩测试的实验室产出与数据一致的值，暗示方法是合理的。把模型基于这，一shear测试被执行计算山峰砍mudded置闰的力量，与在文学报导的价值一致，从而提供为调查mudded的机械性质的一条新途径置闰材料。

简介：Studiedtheeffectofionicstrengthontheuptakeoftaurineonastrong-basicanionexchangeresin.ThebatchphaseequilibriumexperimentsoftaurineontheanionexchangeresinD290wereconductedatdifferentionicstrength,andthentheamountsofuptakeoftaurineontheresinatdifferentpHweredetermined.TheionexchangemechanismsoftaurineontheanionexchangeresinatdifferentpHwerediscussed.Experimentalresultsshowedthatwithincreaseoftheionicstrengthofsolution,theadsorbedamountoftaurineontheresinD290decreased;AddingsmallamountsofNaOHorHClintothesystemoftaurineaqueoussolution/D290anionresinwouldmaketheamountoftaurinetakenupontheresintodecreaseduetothecompetitionuptakesofhydroxylionwithtaurineorthedecreaseintheamountofabsorbablezwitterionsoftaurineinthesolutionandexcludingthecationsoftaurinefromtheanionresin.

简介：Theproductionindexesweredeterioratedduetoqualitycoke,UtilizationFactor2.0t/m3·d,PCI100kg/T,AccordingtoAnalysistheMechanismofProductionoflowhotstrengthcokequalityonBlastFurnaceSmooth,ThecokecoldstrengthretainedM10<6.3overalongperiodoftimeinordertoinsurecokegranularityandpermeabilityindexincohesivezone;Aad<12andgranularitytranquilizationisusefulBFproduction.ThePCIprotectcokehotstrengthbyhighratebituminouscoals;highrateH2inBFgasbatecokedemolish.blastfurnaceoperation,onmonitoringandoperationBF,tranquilizationtheBLASTFURNACEtemperature,PTcontrolsparameterareaisabout1500℃;strengthenmanagementofpermeabilityindex,improveTop-pressureforBlastFurnace,StrengtheningtheManagementoftheRawMaterialsandFuel,logicalrateofsinterLeveloffabout70%toimproveMetallurgicalPropertiesofBurdens.ParametersofwindhavebeenadoptedAbout10000-11000kg·m/s;,theoreticalflametemperatureinablastfurnacehavebeenadjustedareaisabout2050-2200℃;thetemperaturedirectionaboutcopperstavemanagementestablishedact;accordingtothismeasures,AccordingtoImprovementCenterGasFlowInstabilityinthefirstplace,thegasflowdistributionturnstothereasonablestate.Strengthenfurnacecasthouseoperationect,UtilizationFactorimprove2.2t/m3·d,PCI130kg/T.ColdandhotstatestrengthindexesofcokeonBFproductionwereinstability.AccordingtooptimizetheOperatingParameteinspecificallyeconomytechnologyindexesconduction,theBFcondictioncankeepingsteadyandsmooth.

简介：Fromtheviewpointofweldingmechanics,twonewweldingmethods-weldingwithtrailingpeeningandweldingwithtrailingimpactiverollingwereintroduced.Foraluminumalloythin-shellstructureswithhighstrength,weldingwillleadtohotcracking,poorjointanddistortion.Inordertosolvethem,trailingimpactivedevicewasusedbehindweldingtorchtoimpactthedifferentpositionsofweldedjoints,thusrealizingtheweldingwithfree-hotcracking,lowdistortionandjointstrengthening.Byuseofimpactiverollingwheelsinsteadofpeeningheads,theoutlookofweldedspecimencanbeimprovedandstressconcentrationatweldtoescanbereduced.Equipmentofthistechnologyissimpleandportable.Itcanusedtoweldsheets,longitudinalandring-likebeamsoftube-likestructures,aswellasthethin-shellstructureswithclosedweldssuchasflangesandhatches.Sothetechnologyhasthewideapplicationforegroundinthefieldsofaviationandaerospace.

简介：Theadditionofahardenerisnecessaryforthecuringofurea-formaldehyde(UF)adhesivesintheproductionofMDFandparticleboard.Themostcommonlyusedhardener,ammoniumchloride,however,issuspectedtocausetheformationofpoisonousdioxinwhenwasteboardsarecombustedandhenceconsideredasapotentialsourceofpollution.Toassessthefeasibilityofsubstitutingammoniumsulphateforammoniumchloride,workingpropertiesandbondingstrengthweremeasuredforUFadhesiveswiththetwo...

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简介：Theblastresistanceofstructuresusedinbuildingsneedstobeinvestigatedduetotheincreasedthreatofaterroristattack.ThedamagedonebyCompositionBorPowergeltosteelfibrereinforcedreactivepowderconcrete(SFRPC)panelsandordinaryreinforcedconcrete(RC)panelsofequivalentstaticflexuralstrengthiscompared.A0.5kgchargewasdetonatedatadistanceof0.1mfromthe1.3m×1.0m×0.1m(thick)panels,whichweresimplysupportedandspaning1.3m.Dynamicdisplacementmeasurements,high-speedvideorecordingandvisualexaminationofthepanelsforspallandbreachwereundertaken.TheSFRPCpanelswithstoodthebarechargeblastbetterthanthereinforcedordinaryconcretepanels.Neithertypeofpanelwasbreachedusinga0.5kgcharge.TheRCpanelexhibitedmorespallingwhenCompositionBwasused.UndersuccessiveCompositionBloadingconditions,theRCpanelwasbreached.IncomparisontheSFRPCpanelwasnotbreached.ExposuretofragmentingchargeloadingconditionsconfirmedtheseperformancedifferencesbetweentheSFRPCpanelandthereinforcedordinaryconcretepanel.

简介：BycombiningtheB-splinebasissetwithmodelpotential(B-spline+MP),wepresentoscillatorstrengthspectraofRydbergLiatomsinexternalfields.Thephotoabsorptionspectraareanalyzed.Overthenarrowenergyrangesconsideredinthispaper,thestructureofthespectracanbeindependentoftheinitialstatechosenforagivenatom.Ourresultsareingoodagreementwithprevioushigh-precisionexperimentaldataandtheoreticalcalculations,wheretheR-matrixapproachtogetherwithmultichannelquantumdefecttheory(R-matrix+MQDT)wasused.ItissuggestedthatthepresentmethodscanbeappliedtodealwiththeoscillatorstrengthspectraofRydbergatomsincrossedelectricandmagneticfields.

简介：Theinterfacialbindingcovalentbonddensity(CBD)andthelocalenvironmentaltotalbondorder(LTBO)oftheNi/Ni3Alinterfacewithdifferentlatticemisfits(δ)werecalculatedbyusingfirst-principlesdiscretevariationXαmethod.ItwasfoundthattheeffectsoflatticemisfitsontheelectronicstructuresofincoherentNi/Ni3Alinterfacewereveryobvious.Ononehand,lessthan-0.6%negativelatticemisfitcanpromotethebindingstrengthofγ/γ′interface.Ontheotherhand,thetotalbondingstrengthofγ/γ′interfacedecreaseswithincreasingδ.Therefore,themagnitudeandsignoflatticemisfitmustbecarefullycontrolledforbalancingthehightemperaturecreepstrengthofNi-basesinglecrystalsuperalloyandthestructuralstabilityofγ/γ′interfacewhenonedesignsanewNi-basesinglecrystalsuperalloy.