简介：Vibrationfatigueisthemainfailuremodeofcompressorblade.Evaluatingthevibrationstressofbladethatleadstocrackingisveryusefulforanalysisofvibrationfatigue.Inthispaper,fatiguestressestimationmethodsbyquantitativefractographywerestudiedthroughexperimentalbladeandin-servicefirst-stagecompressorbladeinordertoevaluatetheinitiationvibrationstressofin-serviceblade.Theanalysisprocessofinitiationvibrationstresswasestablished.Theevaluatingresultofvibrationstressofin-servicebladesubjectedtocentrifugalforceandbendingvibrationstressagreeswithaeroenginetestresult.Itisshownthattheevaluationmethodcannotonlyevaluatetheequivalentfatiguestressesofdifferentcrackdepthsbutalsoyieldtheinitiationequivalentfatiguestress.

简介：Inthepresentstudy,artificialneuralnetwork(ANN)approachwasusedtopredictthestress–straincurveofnearbetatitaniumalloyasafunctionofvolumefractionsofaandb.Thisapproachistodevelopthebestpossiblecombinationorneuralnetwork(NN)topredictthestress–straincurve.Inordertoachievethis,threedifferentNNarchitectures(feed-forwardback-propagationnetwork,cascade-forwardback-propagationnetwork,andlayerrecurrentnetwork),threedifferenttransferfunctions(purelin,Log-Sigmoid,andTan-Sigmoid),numberofhiddenlayers(1and2),numberofneuronsinthehiddenlayer(s),anddifferenttrainingalgorithmswereemployed.ANNtrainingmodules,theloadintermsofstrain,andvolumefractionofaaretheinputsandthestressasanoutput.ANNsystemwastrainedusingthepreparedtrainingset(a,16%a,40%a,andbstress–straincurves).Aftertrainingprocess,testdatawereusedtochecksystemaccuracy.Itisobservedthatfeed-forwardback-propagationnetworkisthefastest,andLog-Sigmoidtransferfunctionisgivingthebestresults.Finally,layerrecurrentNNwithasinglehiddenlayerconsistsof11neurons,andLog-Sigmoidtransferfunctionusingtrainlmastrainingalgorithmisgivinggoodresult,andaveragerelativeerroris1.27±1.45%.Intwohiddenlayers,layerrecurrentNNconsistsof7neuronsineachhiddenlayerwithtrainrpasthetrainingalgorithmhavingthetransferfunctionofLogSigmoidwhichgivesbetterresults.Asaresult,theNNisfoundedsuccessfulforthepredictionofstress–straincurveofnearbtitaniumalloy.

简介：AninorganicnanomaterialscombinationofSm,Ag,andTiO2wassynthesizedusingsupercriticalfluiddrying(SCFD)combinedwithsol-geltechniques.Thestructure,photocatalysisandbacteriostaticactivityofthematerialswerecharacterizedbyX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),X-rayphotoelectronspectroscopy(XRPS),photocatalyticperformance,andantibacterialactivityexperiments.TheXRDresultsshowedthattheaverageparticlediameterofSm/Ag/TiO2was14.62nmandAgandSmionsweredispersedonthesurfaceofTiO2inahighlydispersed,amorphousform.TheTEMimageshowedthatthesizeoftheparticlewas12nmusingtheschererformula.TheXPSresultshowedthattheelementSmwasdopedandAgwasloadedinorganicnanomaterialssuccessfully.Sm/Ag/TiO2exhibitedoptimalphotocatalyticpropertiesat600oC,thephotocatalyticoptimalproportionofSm/Ag/TiO2was2:2:100.Whenthemolarratiowas2:2:100,thebacteriostaticcirclediameterwas16mmforStaphylococcusaureus,theminimumbacteriostaticconcentrationwas200μg/mLforwhitebeadscoccus,andtheminimumbactericidalconcentrationwas2×104μg/mLforwhitebeadscoccus.TheSEMresultsshowedthattheantibacterialmaterialattachedtothecandidaalbicanscellsurface,cellsappearedfolddeformation.ThereforetheinorganicnanomaterialsSm/Ag/TiO2hadhightemperatureresistance,goodphotocatalyticandantibacterialcharacteristicsinvisiblelight.

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