glass fibre reinforced polyetherimide on polymer and steel counterface materials.docx

glass fibre reinforced polyetherimide on polymer and steel counterface materials.docx

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glassfibrereinforcedpolyetherimideonpolymerandsteelcounterfacematerials

Optimizationofinfraredradiationcureprocessparametersforglassfiberreinforcedpolymercomposites  OriginalResearchArticle

Materials&Design,Volume32,Issue3,March2011,Pages1129-1137

P.KiranKumar,N.V.Raghavendra,B.K.Sridhara

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AbstractAbstract|Figures/TablesFigures/Tables|ReferencesReferences

Abstract

Elevatedtemperaturepostcuringisoneofthemostcriticalstepintheprocessingofpolymercomposites.Itensuresthatthecompletecross-linkingtakesplacetoproducethetargetedpropertiesofcomposites.Inthisworkinfraredradiation（IR）postcuringprocessforglassfiberreinforcedpolymercompositelaminatesisstudiedasanalternativetoconventionalthermalcure.DistancefromtheIRsource,curingscheduleandvolumeofthecompositewereselectedastheIRcureparametersforoptimization.Designofexperiments（DOE）approachwasadoptedforconductingtheexperiments.Tensilestrengthandflexuralstrengthofthecompositelaminateweretheresponsesmeasuredtoselectthefinalcureparameters.Analysisofvariance（ANOVA）,surfaceplotsandcontourplotsclearlydemonstratethatthedistancefromtheIRsourceandvolumeofthecompositecontributenearly70%totheresponsefunctions.ThisestablishesthatpolymercompositescuredusingIRtechniquecanachievethesamepropertiesusingonly25%ofthetotaltimecomparedtothatofconventionalthermalcuring.

ArticleOutline

1.Introduction

2.Materials

3.Experiments

4.Resultsanddiscussion

5.Conclusions

Acknowledgements

References

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Graphicalabstract

Conventionalthermalpostcuringprocessofpolymercompositeshasthedisadvantagesoflongercureschedule,presenceofthermalgradientbetweenthecoreandouterlayersanduncuredresinpatcheswithinthecompositelaminate.Infraredradiation（IR）whichisapartofelectromagneticspectrum,likeotherradiationcuringmethods,itisutilizedforprocessingoffoodproducts,heatingmetalsandotherapplications.Thesametechnologyisextendedforcuringofpolymercompositelaminatesinthiswork.IRcuringresultsinvolumetricheating,henceitisfasterandbettercomparedtothermalcuring.Considerableamountoftimeissavedasunderstoodfromthegraph.

Researchhighlights

►IRcuringutilizesonly25%oftotaltimeascomparedtoconventionalthermalcuringmethod.►TheoptimizedprocessparametershavebeendevelopedforInfraredradiationcuringprocess.►Infraredradiationcuringcanbeeffectivelyemployedforcuringofpolymercompositelaminates.

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Amethodforoptimaldesignofsteelfiberreinforcedconcretecomposition  OriginalResearchArticle

Materials&Design,InPress,CorrectedProof,Availableonline19February2011

L.Dvorkin,O.Dvorkin,V.Zhitkovsky,Y.Ribakov

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Abstract

Existingdesignapproachesforsteelfiberreinforcedconcretecompositionpracticallydonotconsidertheinteractionbetweentheconcretecomponents.Itdecreasesthedesignefficiencyandaccuracy.Thepaperdealswithmethodologyfordesignofoptimalsteelfiberedfine-grainedconcretecompositionbasedonstiffmixtures.Suchconcreteisusedforproductionofthinwalledpreciseelements.Thecurrentinvestigationenablestofindtheinfluenceofthemainfactors（water–cementratio,fibercontent,finenessandquantityofsand）ontheconcretemixturestiffness,compressiveandflexuralstrengthofconcrete.Thestudyhasalsoenabledtoobtaincorrespondingmathematicalmodelsofconcreteproperties.Basedonthemodelsamethodologyfordesignofsteelfiberedconcretewasdevelopedandappropriatenomogramswereprepared.Theproposedmethodologyallowsobtainingofoptimalsteelfiberedfine-grainedconcretecomposition,takingintoaccounttherequiredflexuralstrengthofconcrete,sandfinenessandconcretemixtureworkability.

ArticleOutline

1.Introduction

2.AvailablemethodsfordesignofSFCmixtures

3.Researchsignificance,aimandscope

4.Experimentsplanning

5.Modeldescription

6.Experimentalprogram

6.1.Materialsproperties

6.2.Descriptionofspecimens,storageconditionsandtestsetup

7.Resultsanddiscussion

8.Numericalexample

9.Conclusions

References

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Highlights

►Mathematicalmodelsforexperimentsplanningareused.►Nomogramsfordesignofsteelfiberedconcretearedeveloped.►Designofconcretecompositionaccordingtodesiredpropertiesisproposed.

Torsionalstrengtheningofrectangularandflangedbeamsusingcarbonfibre-reinforced-polymers–Experimentalstudy  OriginalResearchArticle

ConstructionandBuildingMaterials,Volume22,Issue1,January2008,Pages21-29

ConstantinE.Chalioris

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Abstract

Thepresentexperimentalinvestigationdealswiththetorsionalstrengtheningofconcretebeamswithoutstirrupsusingepoxy-bondedcarbonfibre-reinforced-polymer（FRP）sheetsandstripsasexternaltransversereinforcement.Theexperimentalprogramcomprises14rectangularandT-shapedbeamstestedunderpuretorsion.Basedonthemeasuredvaluesofthetorsionalmomentatcrackingandatultimate,thecorrespondingtwists,thebehaviouralcurvesandthefailuremodesofthebeams,usefulconcludingremarksareindicated.ThestrengthenedrectangularbeamsusingfullwrappingwithcontinuousFRPsheetsperformedenhancedtorsionalbehaviourandhighercapacitythanthestrengthenedbeamswithFRPstrips.U-jacketedflangedbeamsexhibitedprematuredebondingfailureandsubstantialreductionsofthepotentialtorsionalcapabilitiesarereported.Ingeneral,FRPfabricscouldeffectivelybeusedasexternaltorsionalreinforcementinunder-reinforcedconcreteelementswithoutsteeltransversereinforcement.

ArticleOutline

1.Introduction

2.Experimentalprogram

2.1.Specimencharacteristics

2.2.Testsetup

3.Testresultsanddiscussions

3.1.Torsionalstrengthvaluesandbehaviouralcurves

3.2.Crackpatternsandfailuremodes

3.3.ContributionofFRPsheetstothetorsionalcapacity

4.Concludingremarks

Acknowledgements

References

Vitae

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29

CombinedloadingofabridgedeckreinforcedwithastructuralFRPstay-in-placeform  OriginalResearchArticle

ConstructionandBuildingMaterials,Volume23,Issue4,April2009,Pages1605-1619

JosephP.Hanus,LawrenceC.Bank,MichaelG.Oliva

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Abstract

Theinvestigationofastructuralfiber-reinforced-polymer（FRP）stay-in-place（SIP）formusedtoconstructandreinforceadeckforaprototypemilitarybridgesystemisdiscussedinthispaper.Forthisapplicationthedeckissubjectedtocombinedbendingandcompressivelongitudinalaxialloadbecauseitalsoservesasthetopchordofthetrussforthebridgesystem.Inanexperimentalprogram,deckspecimensweretestedinseveralconfigurations.TheresultsarecomparedtoACI440designguideequations,andcapacitypredictiontechniquesareproposedforlimitstatesassociatedwithflexuralandflexural-shearunderthecombinedloading.ItwasfoundthattheACI440equationsaccuratelypredictedtheflexuralandflexural-shearcapacitiesundercombinedloadsprovidedthateccentricityduetothecombinedloadingwasaccountedforinthecalculations.

ArticleOutline

1.Introduction

2.Deckcomponentdesign

3.Experimentalprogram

3.1.Constructionofspecimens

3.1.1.Singlespanspecimens

3.1.2.Doublespanspecimens

3.2.Specimendetails

3.3.Testsetup,instrumentation,andloading

3.3.1.Singlespantestconfigurationwithoutaxialload

3.3.2.Singlespantestconfigurationwithaxialload

3.3.3.Doublespantestconfigurationwithaxialload

3.3.4.Instrumentation

3.3.5.Loading

3.4.Testresults

3.4.1.Singlespantestresultswithoutaxialload

3.4.2.Singlespantestresultswithaxialload

3.4.3.Doublespantestresultswithaxialload

3.4.4.Moment–deflectioncurves,allspecimens

4.Analysis

4.1.Neutralaxisdepth

4.2.Flexuralfailureinspecimenswithbendingloadonly（SS1–SS4）

4.3.Flexuralfailureincombinedbendingandaxiallyloadedspecimens（SS5–SS8）

4.4.Flexural-shearfailureincombinedbendingandaxiallyloadedspecimens（DSA1–DSA2）

5.Conclusions

Acknowledgements

References

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30

Delaminationofpultrudedglassfiber-reinforcedpolymercompositessubjectedtoaxialcompression  OriginalResearchArticle

CompositeStructures,Volume91,Issue1,November2009,Pages66-73

YuBai,TillVallée,ThomasKeller

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Abstract

AxialcompressionexperimentswereconductedonpultrudedE-glassfiber-reinforcedpolymerlaminatesofdifferentslenderness.Second-orderdeformationsgreatlyincreasedthebendingmomentsandshearforcesofslenderspecimens.Delaminationfailureoccurredinallspecimens,independentofslenderness.Basedonmeasurementsoflateraldeformationsatdelaminationinitiation,thedistributionofshearforceswasdeterminedandthestressstateatfailurewasobtainedandcomparedtoanadoptedfailurecriterion.Ultimateloadswerefurtherpredictedba