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1、UMATUsersubroutinetodefineamaterial'smechanicalbehavior.Product:Abaqus/Standard Warning: Theuseofthissubroutinegenerallyrequiresconsiderableexpertise.Youarecautionedthattheimplementationofanyrealisticconstitutivemodelrequiresextensivedevelopmentandtesting.Initialtestin
2、gonasingle-elementmodelwithprescribedtractionloadingisstronglyrecommended.References·“User-definedmechanicalmaterialbehavior,”Section25.7.1oftheAbaqusAnalysisUser'sManual·“User-definedthermalmaterialbehavior,”Section25.7.2oftheAbaqusAnalysisUser'sManual·*USERMATERIAL·“S
3、DVINI,”Section4.1.11oftheAbaqusVerificationManual·“UMATandUHYPER,”Section4.1.21oftheAbaqusVerificationManualOverviewUsersubroutineUMAT:·canbeusedtodefinethemechanicalconstitutivebehaviorofamaterial;·willbecalledatallmaterialcalculationpointsofelementsforwhichthematerial
4、definitionincludesauser-definedmaterialbehavior;·canbeusedwithanyprocedurethatincludesmechanicalbehavior;·canusesolution-dependentstatevariables;·mustupdatethestressesandsolution-dependentstatevariablestotheirvaluesattheendoftheincrementforwhichitiscalled;·mustprovideth
5、ematerialJacobianmatrix,,forthemechanicalconstitutivemodel;·canbeusedinconjunctionwithusersubroutineUSDFLDtoredefineanyfieldvariablesbeforetheyarepassedin;and·isdescribedfurtherin“User-definedmechanicalmaterialbehavior,”Section25.7.1oftheAbaqusAnalysisUser'sManual.Stora
6、geofstressandstraincomponentsInthestressandstrainarraysandinthematricesDDSDDE,DDSDDT,andDRPLDE,directcomponentsarestoredfirst,followedbyshearcomponents.ThereareNDIdirectandNSHRengineeringshearcomponents.Theorderofthecomponentsisdefinedin“Conventions,”Section1.2.2oftheAb
7、aqusAnalysisUser'sManual.Sincethenumberofactivestressandstraincomponentsvariesbetweenelementtypes,theroutinemustbecodedtoprovideforallelementtypeswithwhichitwillbeused.DefininglocalorientationsIfalocalorientation(“Orientations,”Section2.2.5oftheAbaqusAnalysisUser'sManua
8、l)isusedatthesamepointasusersubroutineUMAT,thestressandstraincomponentswillbeinthelocalorientation;and,intheca
