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Cyclic Fatigue of Nanoparticle Modified Epoxy  
Cyclic Fatigue of Nanoparticle Modified Epoxy
资料类型: PDF文件
关键词: Fatigue  Fracture  toughness  Nanoparticle  modified  epoxy  
资料大小: 77K
所属学科: 分子表征
来源: 来源网络
简介:
Sincetheintroductionofnanotechnology,nanoparticleshavebeenextensivelyusedinpolymermatrixcompositesasreinforcements.Thus,researchonthemechanicalperformanceofnanocompositeshascontinuouslyattractedgreatattentionwithinboththescientificandengineeringcommunities.Inrecentyears.theeffectsofsilicananoparticlesandrubbernanoparticlesonthestaticfracturetoughnessofbulkepoxieswereinvestigatedinourpreviousstudy.Itwasfoundthatrubber/epoxycompositeshavehightoughnessandrubber/silica/epoxyhybridcompositespossesswell-balancedelasticstiffnessandfracturetoughness.Asengineeringmaterials,nanocompositesareoftensubjectedtocyclicloadingconditions.Besidestheirstaticmechanicalproperties,theirfatigueproperties,suchasfatiguelifetime(S-Ncurve),fatiguethreshold(AKtriorAGtri)andfatiguecrackpropagationrate(da/dN),arealsoofgreatimportance.Inourpreviousstudy,S-Ncurvesforun-notchedsmoothsampleswereobtained,whichshowedthatthefatiguelifeofepoxywasincreasedbyaddingsilicananoparticlesbutdecreasedbyaddingrubbernanoparticles.Amorerecentworkonthefatiguecrackgrowthofnanoparticlemodifiedepoxyreportedthatthefatiguecrackgrowthratesda/dNofalltestedsamplesobeyedParispowerlawandshowedfatiguethresholdsAGtri.SilicananoparticlesincreasedAGtriofneatepoxybutrubbernanoparticlesdidnot.However,bothnanoparticlesdecreasedda/dNatgivenAGintheParisregimecomparedtoneatepoxy,thoughsilicananoparticleismoreeffectivethanrubber.Followingabovesystematicexperimentsonthefractureandfatigueofnanoparticlemodifiedepoxy,thispaperisaimedtopresentaquantitativeanalysisonthefatiguelifeofnanoparticlemodifiedepoxy.Differenttougheningmechanismsobservedfrompreviousexperimentswillbeconsideredinthenumericalpredictionofthefatiguelifeandthefailuremode.Themodellingandthesimulationmethoddevelopedfromthisstudywillbeverifiedbyexperimentalresults.
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