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Cyclic Fatigue of Nanoparticle Modified Epoxy  
Cyclic Fatigue of Nanoparticle Modified Epoxy
資料類型: PDF文件
關鍵詞: Fatigue  Fracture  toughness  Nanoparticle  modified  epoxy  
資料大?。?/td> 77K
所屬學科: 分子表征
來源: 來源網絡
簡介:
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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上傳時間: 2013-06-21 16:16:06
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