简介：Grapheneisthestrongestmaterialbutitsperformanceissignificantlyweakenedbyvacancydefects.Weusemoleculardynamicssimulationstoinvestigatethetensilebehaviorofagraphenewhichcontainsasinglevacancydefect.Ourresultssuggestthatbecauseofthesinglevacancy,thefracturestrengthofgraphenelossesabout17.7%.Thestressconcentrationaroundthevacancydefectleadstothedestructionofnearbysix-memberringsstructure,whichformstheinitialcrack.Thepropagationdirectionofthiscrackindefectivegrapheneisatanangleof60°tothetensiledirectioninitially,butthenbecomesperpendiculartothetensiledirection.
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