How to Make UMATs for Soils in ABAQUS_0.docx

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1、HowtoMakeUMATsforSoilsinABAQUSHowtomakeUMATsforsoiIsinABAQUSElasticmodeIRepresentationRepresentationMatrixrepresentationchosen,takesadvantageofsymmetry,(CoincideswithBAQUSrepresentation.)T=TIlT22T33T12T13T23,=112233212213223=112233121323(5)Noticetheselectionofshearstrain.SpecialcaretokeepinvarianceW

2、henmakingmatrixoperations.GeotechnicalResearchGroupUniversityof1.osAndespressionindexinsemi-logspace.HypoelasticityiG=GOpatm(2.97e)2(1+e)p(kp/patmk)(8)being:GOinitialshearmodulus,patmatmosphericpressure.GeotechnicalResearchGroupUniversityof1.osAndesponentsNSHR:numberofdirectshearCoinponentsNTENS:tot

3、alcomponents=NDI+NSHRGeotechnicalResearchGroupUniversityof1.osAndesputationsandendofsubroutineUMATCVoidratiovoid=void+(l.+void)*(DeltaE(I)+DeltaE(2)+DeltaE(3)CTypeofmodelSTATEV(l)=modelCVoidratioSTATEV(2)=voidCAtmosphericmeanpressureSTATEV(3)=patmCInitialShearmoduIusSTATEV(4)=GOCAtmosphericmeanpress

4、ureSTATEV(5)=kappaCRETURNENDGeotechnicalResearchGroupUniversityofl.osAndespressionindex(parameter).theswellingindex(parameter).GeotechnicalResearchGroupUniversityof1.osAndesponent11.3p22plasticstraincomponent22.4p33plasticstraincomponent33.5p!2plasticstraincomponent12.6pl3plasticstraincomponent13.7p

5、23plasticstraincomponent23.8pcmeanoverconsolidatedstress.GeotechnicalResearchGroupUniversityof1.osAndesia.uniandes.edu.coHowtomakeUMATsforsoilsinABAQUSHowtomakeUMATsforsoilsinABAQUSCAM-C1.AYplasticitymodellmplicitIntegrationImplicitIntegrationSeeBorja,R.I.et.al.,1990forimplicitintegration.Somedetail

6、softheintegralionscheme:Implicitintegrationusingtheclosestpointprojection.AreturnmappingaIgorithmisused.Thevoidratioeisassumedtobeconstantinanintegrationincrement.2nestedNEWTON-RAPHSONalgorithmneededinordertofindtheconsistencyparameterandthemeanconsolidationstresspc.AconsistentJacobianisusedinordertopreservetheasymptoticrateOfquadraticglobalconvergenceBorja,R.I.et.al.,1990.ThefollowingframespresentstheimplicitintegrationschemefortheMCCmodel.OpenthearchiveCamClay.fandfollowtheframes.GeotechnicalResearchGroupUniversityof1.osAndesia.uniandes.edu.coHowtomakeUMATsforsoilsinABAQUS