简介：Fibrestressofglassfibrereinforcedpolymericcopmositesonloadisdeterminedbyusingopticalfibreasmodelfiberandbymeansoflaserinterferencemethod.Inaddition,theoriginationoffibrestressduringmouldingprocessofcompositesandtherelationbetweenfiberstressofloadedcompositesandexternalstressareexamined.Theexperimentsshowthatfibrestressisrelatedtomolecularstructureofinterfacialmaterialsandstructureofinterfaciallayers.Whenstressistransferredfrommatrixtofibre,eachinterfaciallayerhasdifferentstressgradientanddeformability.Thispropertycanbecharacterizedbyintroducinganinterfacialstresstransfercoefficientktothetwo-phasemodel.

简介：Inordertoresearchthefieldsensingcharacteristicofthecarbonfibersmartmaterial,theTikhonovregularizationprincipleandthemodifiedNewton-Raphson（MNR）algorithmwereadoptedtosolvetheinverseproblemoftheelectricalresistancetomography（ERT）.AnERTsystemofcarbonfibersmartmaterialwasdeveloped.Fieldsensingcharacteristicwasresearchedwiththeexperiment.Theexperimentalresultsshowthatthespecificresistancedistributionofcarbonfibersmartmaterialishighlyconsistentwiththedistributionofstructuralstrain.Highresistancezonerespondstohighstrainarea,andthespecificresistancedistributionofcarbonfibersmartmaterialreflectsthedistributionofsamplestrainincoveringarea.Monitoringbycarbonfibersmartmaterialoncomplicatedstrainstatusinsamplefielddomainisrealizedthroughtheoreticalandexperimentalstudy.

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简介：Liquidcompositemoulding(LCM)processesareusedtomanufacturehighqualityandcomplex-shapedcompositepartsintheautomotive,marine,aerospaceandcivilindustries.On-linesensingplaysanimportantroleincontrollingthequalityofthefinalproductintheLCMmanufacturingenvironment.Thelong-periodfibergrating(LPG)technology,anewreal-timefiberopticsensorsystem,wasdevelopedtomonitortheflowfrontprogression.Thesensoroperationandcharacterizationundervariousprocessconditionswerediscussedindetail.TheexperimentalresultsshowedthatLPGsensorswererobustandreliabletodetectthearrivalofresinatpre-selectedlocationsinstructureswithlow-mediumfibervolumefraction;howeverwerelimitedatdifferentdepthsinstructureswithhighfibervolumefraction.

简介：Modifiedsensingmembranesbasedonfluorescencequenchingwerepreparedbythesol-gelmeth-od,usingformamideasthedryingcontrolchemicaladditive,tetraethoxysilaneasthemainmaterial,Ru(phen)3Cl2astheindicator.Themembranewiththeoptimumthicknessof20-50μmisuniformandcrack-free,inwhichtheindicatorhasaverysmallleakingrate.Themembraneisimmersedinwaterfor50h,themembranesensingparameterMdecreasesbylessthan5%.Thefiberopticoxygensensorwiththesensingmembranehasadetectionlimitof5×10-6M(ppm),aresponsetimeoflessthan30s,excellentreproducibilityandstability.

简介：ThedistributedopticalfibersensingtechnologywasusedtoinvestigatethefracturebehavioroftheEpoxyAsphaltMixture.Thespatialdistributionandvariationofthestraindevelopmentwithcrackpropagationwereacquiredusingthebrillouinopticaltime-domainreflectometerthroughtheloadingexperimentsofthecompositebeamstructure.Inaddition,afiniteelementmodelofthecompositebeamstructurewasdevelopedtoanalyzethemechanicalresponsesoftheepoxyasphaltmixtureusingtheextendedfiniteelementmethod.Theexperimentalresultsshowthatthedevelopmentofcrackpropagationbecomesinstablewiththeincreaseoftheload,andlargerloadswillgeneratedeepercracks.Moreover,thenumericalresultsshowthatthemechanicalresponseofthecracktipchangeswiththecrackpropagation,andtheworstareasthatsubjectedtocrackdamagearelocatedonbothsidesofthecompositebeamstructure.

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简介：用organo听Sn(OC4H9)4作为先锋，钠dodecylsulfonate(SDS)和SDS明胶(SDS-G)象模板复杂，二听二氧化物胶体的粒子被准备由一自己组装方法。两个SnO2产品分别地与SDS-G与SDS和SnO2-C粒子被标记SnO2-B粒子，它在制作相应于SnO2-B和SnO2-C传感器的SnO2煤气的传感器被使用。X光检查衍射(XRD)，扫描电子显微镜学(SEM)，传播电子显微镜学(TEM)和thermogravimetry和不同热分析(TG/DTA)被用于描述。试验性的结果证明SnO2-B胶体的粒子由mesoporous组成像片的粒子，当SnO2-C粒子主要由球形的粒子组成时。煤气的察觉到大小证明那个SnO2-B传感器执行察觉到反应到所有目标气体的最好，包括H2，C2H5OH和液体石油气体(LPG)。特别地，SnO2-B传感器的察觉到的反应在1000潩獮的集中在H2空气在32点被完成