Progress in Polymer Science.docx
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Progress in Polymer Science.docx
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ProgressinPolymerScience
ApplicationofdirectlasermetaltoolingforAISIH13toolsteel OriginalResearchArticle
TransactionsofNonferrousMetalsSocietyofChina,Volume19,Supplement1,September2009,Pagess284-s287
Jae-HoLEE,Jeong-HwanJANG,Byeong-DonJOO,Hong-SupYIM,Young-HoonMOON
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535
Newmaterialforimplantablecardiacleads OriginalResearchArticle
JournalofElectrocardiology,Volume42,Issue6,November-December2009,Pages566-573
S.SuaveLobodzinski,MichaelLaks
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536
Jointperformanceoftheglassfiberreinforcedpolypropyleneleafspring OriginalResearchArticle
CompositeStructures,Volume93,Issue2,January2011,Pages759-766
C.Subramanian,S.Senthilvelan
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537
Fibrousreinforcedconcretebeamsinflexure:
Experimentalinvestigation,analyticalmodellinganddesignconsiderations OriginalResearchArticle
EngineeringStructures,Volume30,Issue11,November2008,Pages2970-2980
GiuseppeCampione,MariaLetiziaMangiavillano
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Abstract
Theflexuralbehaviorofplainandfibrousreinforcedconcrete(FRC)beamsundermonotonicandcyclicactionswasanalysed.Twelvebeamswerereinforcedwithtopandbottomlongitudinaldeformedsteelbarsandtransversesteelstirrups.Concrete,having30MPacylindricalstrength,wasreinforcedwithhookedsteelfibresatavolumepercentageof1%.Beams,600mminlengthandwithasquaresidecross-sectionof150mm,weretestedinflexureusingathreepointbendingtest,adoptingthreedifferentcoverthicknessesof5,15and25mm,respectively.Theresultsobtainedshowthattheadditionoffibersincreasesthebearingcapacityofthebeamsandensuresmoreductilebehaviour,atthesametimereducingdegradationeffectsundercyclicreversalloads.Moreover,thepresenceoffibersreducesthecoverspallingprocess,alsointhepresenceofhighcoverthicknesses.Shearstrengthofthebeamswascalculatedusingananalyticalexpressiongiveninliteratureforplainconcretebeamsandhereextendedtothecaseoffibrousconcretebeamsofhookedsteelfibersonthesubject,whiletheanalyticalresultsintermsofload–deflectioncurves,undermonotonicactions,weregeneratedusinganon-linearfiniteelementprogram(DRAIN-2DX).ThisprogramwascalibratedonthebasisofconstitutivelawsincompressionandintensioncapableoftakingFRCpropertiesintoaccount,andverifiedagainstexperimentaldata.Finally,practicalconsiderationsregardingthechoiceoftheoptimumgeometricalratiooflongitudinalandtransversesteelbarsfortheductilebehaviourofsinglereinforcedcross-sections.MoreovershearstrengtharegivenandcomparedwithEuropeanandInternationalcodeprescriptions.
ArticleOutline
Nomenclature
1.Introduction
2.Experimentalprogram
2.1.Specimendetails
2.2.Characteristicsofmaterialsandtestsset-up
3.Experimentalresults
3.1.Materialcharacterization
3.2.Monotonicflexuraltests
3.3.Cyclicflexuraltests
4.Analyticalpredictionofload–deflectioncurvesanddesignconsiderations
4.1.Constitutivelawsofsteelandconcrete
4.2.Flexuralandshearstrengthoffibrousreinforcedconcretebeams
4.3.Monotonicload–deflectionresponse
5.Conclusions
References
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538
Modelingthelow-cyclefatiguebehaviorofvisco-hyperelasticelastomericmaterialsusinganewnetworkalterationtheory:
Applicationtostyrene-butadienerubber OriginalResearchArticle
JournaloftheMechanicsandPhysicsofSolids,Volume59,Issue2,February2011,Pages473-495
G.Ayoub,F.Zaïri,M.Naït-Abdelaziz,J.M.Gloaguen
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Abstract
AlthoughseveraltheoriesweremoreorlessrecentlyproposedtodescribetheMullinseffect,i.e.thestress-softeningafterthefirstload,thenonlinearequilibriumandnon-equilibriummaterialresponseaswellasthecontinuousstress-softeningduringfatigueloadingneedtobeincludedintheanalysistoproposeareliabledesignofrubberstructures.Thiscontributionpresentsforthefirsttimeanetworkalterationtheory,basedonphysicalinterpretationsofthestress-softeningphenomenon,tocapturethetime-dependentmechanicalresponseofelastomericmaterialsunderfatigueloading,andthisuntilfailure.Asuccessfulphysicallybasedvisco-hyperelasticmodelisrevisitedbyintroducinganevolutionlawforthephysicalmaterialparametersaffectedbythenetworkalteration.Thegeneralformofthemodelcanbebasicallyrepresentedbytwoparallelnetworks:
anonlinearequilibriumresponseandatime-dependentdeviationfromequilibrium,inwhichthenetworkparametersbecomefunctionsofthedamagerate(definedastheratiooftheappliedcycleovertheappliedcycletofailure).Themechanicalbehaviorofstyrene-butadienerubberwasexperimentallyinvestigated,andthemainfeaturesoftheconstitutiveresponseunderfatigueloadingarehighlighted.Theexperimentalresultsdemonstratethattheevolutionofthenormalizedmaximumstressonlydependsonthedamagerateenduredbythematerialduringthefatigueloadinghistory.Theaveragechainlengthandtheaveragechaindensityarethentakenasfunctionsofthedamagerateintheproposednetworkalterationtheory.Thenewmodelisfoundtoadequatelycapturetheimportantfeaturesoftheobservedstress–straincurvesunderloading–unloadingforalargespectrumofstrainanddamagelevels.Themodelcapabilitiestopredictvariableamplitudetestsarecriticallydiscussedbycomparisonswithexperiments.
ArticleOutline
1.Introduction
2.Experimental
2.1.Materialandmethods
2.2.DiscussiononthemechanicalbehaviorofSBRundercyclicloading
3.Modeling
3.1.Thermodynamicalconsistency
3.2.Constitutiveequationsforlargedeformationviscoelasticity
3.2.1.BranchA:
equilibriumresistance
3.2.2.BranchB:
time-dependentresistance
3.3.Networkalterationkinetics
3.4.Identificationoftheproposedmodel
3.5.Validationoftheproposedmodel
4.Concludingremarks
Acknowledgements
References
539
Impactresponseoffiredamagedpolymer-basedcompositematerials OriginalResearchArticle
CompositesPartB:
Engineering,Volume39,Issue1,January2008,Pages92-107
C.A.Ulven,U.K.Vaidya
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Abstract
Thestructuralintegrityandimpactresistanceofcompositestructuresusedinawiderangeofapplicationscanbedramaticallydebilitatedbecauseofcatastrophicevents.Fireexposurecansignificantlyreducethestructuralintegrityandimpactresistanceofacompositestructureinashortperiodoftime(<100 s).Thecharformedduringfireexposureisveryporous/brittle,andprovidesminimalstructuralsupporttothefibers.Thisstudyinvolvesthelowvelocityimpact(LVI)responseofvacuumassistedresintransfermolded(VARTM)E-glass/vinylester(VE)laminatesandbalsawoodcoresandwichcompositeswithE-glass/VEfacesheets.TheLVIresponseparametersnamelypeakforceandcontactstiffnesswerefoundtodecreaseby20–30%foranE-glass/VElaminate,andby65–75%foranE-glass/VEbalsacoresandwichplate,bothsubjectedtoa100 speriodoffireexposure.Twotypesofboundaryconditions(simplysupported(SS)andafullyfixed(FF))wereadoptedtosupporttheLVIspecimensinthetestfixture.ThedifferencesinLVIresponseofthelaminateresultingfromtheboundaryconditionsweremoreevidentforshortfireexposuretimes(0–100 s).Foralongerperiod(>100 s)offireexposure,theboundaryconditionsmadelittledifferenceintermsoftheoverallpeakforceattainedandthecontactstiffness.Thelocaldensityvariationsinbalsawoodcellsofthecorewerefoundtoinfluencethefireprogressioninthecore,andthecorrespondingimpactresponse.Alowerdensity(150 kg m−3)balsawoodcorewasobservedtoinsulatethefacesheetmorethanonewithahigherdensity(180 kg m−3)whenexposedtofire.Insulationprovidedbythecoreresultedinaccumulationofheatinthefacesheet(andtherebygreaterthermaldamage),ultimatelycausinggreaterlossofcontactstiffnessandpeakcontactforceatearlyfireexposuretimes(0–100 s).Arule-of-mixturesmodelthatestimatesthepost-firemechanicalpropertieshasbeencombinedwithanimpactresponsemodelthatisbasedonclassicalplatetheorytopredictthepost-firelossofimpactstiffnessforanE-glass/VElaminatesubjectedtoLVI.
ArticleOutline
Nomenclature
1.Introduction
2.Experimental
2.1.Compositefabrication
2.2.Fireexposureofcompositeplates
2.3.Lowvelocityimpact
3.Resultsanddiscussion
3.1.Fireexposureoflaminateandsandwichplates
3.1.1.Time-to-ignition
3.1.2.Masslossduringfireexposure
3.2.Post-firelowvelocityimpact
3.2.1.E-glass/VElaminate
3.2.2.E-glass/VEfacesheetswithbalsawoodcoresandwichplates
4.Conclusions
Acknowledgements
References
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Carbonnanotube–polymercomposites:
Chemistry,processing,mechanicalandelectricalproperties ReviewArticle
ProgressinPolymerScien
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