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New insight into fatigue crack growth mechanism in graphene filled natural rubber composites by micro-focus hard X-ray beam line radiation  
New insight into fatigue crack growth mechanism in graphene filled natural rubber composites by micro-focus hard X-ray beam line radiation
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所属学科: 高分子物理
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Naturalrubber(NR)compositewiththeadditionofgraphene(GE)ispreparedbyanultrasonically-assistedlatexmixingandinsitureductionprocess(ULMR)[1].ThefatiguecrackpropagationofunfilledNRandGEfilledNRcomposite(GE/NR)areexaminedunderuniaxialcyclictension.Forthefirsttime,weobservethatGEhasanoppositeeffectoncrackgrowthresistanceofNRwithregardtodifferentfatiguestrains,i.e.atlowerfatiguestrains,theinclusionofGEacceleratesthecrackgrowth,whereasathigherstrains,thecrackgrowthisretardedwiththeadditionofGE[2].ThecompetitionbetweenstraininducedcrystallizationandcavitationatcracktipisbelievedtoplayamajorroleinthetwooppositeeffectsofGEonthecrackgrowth.Themicro-focushardX-raydiffractionbeamline(MF-XRD)withhighspatialresolutionwasutilizedforthestudyofstraininducedcrystallizationaroundthecracktipatvariousmacroscopicextensionscorrespondingtothefatiguestrains.Fatiguecrackresistanceiscorrelatedtostraininducedcrystallizationinanovelway.Anewinsightintothemechanismoffatiguecrackgrowthisproposed.
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