Molecular dynamics simulation of deformation and failure mechanism of kaolinite at different temperatures
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Graphical Abstract
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Abstract
UniaxialtensilesimulationswerecarriedoutinOA,OBandOCdirectionsofkaoliniteatdifferent temperaturesbyusingmoleculardynamicssimulations*Thedeformationandfailureprocessesofkaolinite werestudiedattheatomisticscale*Thechangeofmicrostructure,deformationmechanismandtemperature effectoftensilemechanicalpropertiesofkaoliniteatdifferenttemperatureswerealsoanalyzed*Thiswork wouldbehelpfultounderstandthemechanismsoflargedeformationandfailureofsoftrock*Theresultsindi⁃ catedthattheincreasingoftemperatureresultsinthethermalexpansionofkaoliniteafterrelaxation*Once thecracknucleationappears,itpropagatesveryquicklyandleadstoasharpdecreaseinstressalongOAand OBloadingdirections*ThelayerseparationoccursduringloadingalongOCdirection,whilethestructure couldfailsincethehydrogenbondsarebroken*Themechanicalpropertiesofkaolinitehaveastrongdepend⁃ enceontemperature*Thereisanegativecorrelationbetweentensilestrength,Young*smodulusandtempera⁃
ture*Withtheincreaseoftemperature,thetensileultimatestrainandresidualstrengthtendtodecrease,and thestrengthattenuationcoefficienttendtoincrease*Inaddition,OCdirectionisthemostaffectedbythetem⁃ perature,followedbyOBdirection,andOAdirectionistheleastaffected*
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