ABAQUS子程序USDFLD.docx
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ABAQUS子程序USDFLD
Abaqus/CAEUser'sManual
12.8.5Definingfieldvariablesatamaterialpoint
个材料点岌义场雯量丿
InAbaqus/StandardyoucanintroducedependenceonsolutionvariableswithusersubroutineUSDFLD.Thissubroutineallowsyoutodefinefieldvariablesatamaterialpointasfunctionsoftime,ofanyoftheavailablematerialpointquantitieslistedinoutputvariableidentifiersjSection
4.2」oftheAbdqusAnalysisUser'sManual,andofmaterialdirections.Materialpropertiesdefinedasfunctionsofthesefieldvariablesmay,thus,bedependentonthesolution.
UsersubroutineUSDFLDiscalledateachpointforwhichthematerialdefinitionincludesarefereneetotheusersubroutine・
(A.ABAQUS里面,你能够用子程序USDFLD来求解变量。
USDFLD允许你将一个材料6上的场雯量龙义为肘间场数,能够使用到的材料点亦用户使用手册421节中“abaqus输岀变量的标识码”中彼提及到。
材料的特性菠定义作%场雯量的函救,因此依赖于求解方比。
丿
(柱每个被定义材抖性能的6USDFLD能够後调用丿
ToincludeareferencetousersubroutineUSDFLDinamaterialdefinition:
1.FromthemenubarintheEditMaterialdialogbox.selectGeneral~~UserDefinedField.
(ForinformationondisplayingtheEditMaterialdialogbox.see
‘'Creatingorediting8materiajSection12.7」J
2.ClickOKtoclosetheEditMaterialdialogbox.Alternatively,youcanselectanothermaterialbehaviortodefinefromthemenusintheEditMaterialdialogbox(see“Browsingandmodifyingmaterialbehavior*'Section12.72formoreinformation).
Abaqus/CAEUser'sManualWW
(孑程序USDFLD蛊材料中的龙义it程可洪考下面:
1.疫编辑材料的对话框中’选择General-UserDefinedField
2.AOK关闵编辑材坍的对话框,或者A编辑对话桓中选择另外的一个材料
特性。
)
AbaqusUserSubroutinesReferenceManual
1.L49USDFLD
Usersubroutinetoredefinefieldvariablesatamaterialpoint.
(在一个材料6上使用USDFLD重新灾义场tf)
Product:
Abaqus/Standard
ReferencesC参考丿
•"ObtainingmaterialpointinformationinanAbaqus/Standard
analysis/'Section2」.6
•"Materialdatadefinition,"Section20」.2oftheAbaqusAnalysisUser's
Manual
•-USERDEFINEDFIELD
•"Damageandfailureofalaminatedcompositeplate/'Section1」」4oftheAbaqusExampleProblemsManual
•“USDFLD,”Section4」.24oftheAbaqusVerificationManual
Overview(机述丿
UsersubroutineUSDFLD:
•allowsyoutodefinefieldvariablesatamaterialpointasfunctionsoftimeorofanyoftheavailablematerialpointquantitieslistedintheOutputVariableIdentifierstable("Abaqus/Standardoutputvariableidentifiers/'Section4.2」oftheAbaqusAnalysisUser'sManual)excepttheuser-definedoutputvariablesUVARMandUVARM/7;
•canbeusedtointroducesolution-dependentmaterialpropertiessincesuchpropertiescaneasilybedefinedasfunctionsoffieldvariables;
•willbecalledatallmaterialpointsofelementsforwhichthematerialdefinitionineludesuser-definedfieldvariables;
•mustcallutilityroutineGETVRMtoaccessmaterialpointdata;
•canuseandupdatestatevariables;and
•canbeusedinconjunctionwithusersubroutineUF1ELDtoprescribepredefinedfieldvariables.
(孑程序USDFLD:
1.允许你>4一个材料点定义场变量作为肘间函数■柱输出变量的标示符中列出了所有材料点的雯量,除了用户定义的输出雯量和uvarmuvarmo
2.能够用来介绍材抖的性能,并且这种性能能够菠龙义为场变量的
3.柱各元素的材料点中,用户龙义的场雯量能够被调用。
4.处须调用使用程序GETVRM来接入妨料点救据
5.可以和UFIELD—起使用来福述预岌义的场变量丿
Explicitsolutiondependence(朗确鮮的关糸)
Sincethisroutineprovidesaccesstomaterialpointquantitiesonlyatthestartoftheincrement,thesolutiondependeneeintroducedinthiswayisexplicit:
thematerialpropertiesforagivenincrementarenotinfluencedbytheresultsobtainedduringtheincrement.Hence,theaccuracyoftheresultsdependsonthesizeofthetimeincrement.Therefore,youcancontrolthetimeincrementinthisroutinebymeansofthevariablePNEWDT.
(由于程序提供的接入点只是柱增量的开始,解之间的相互关糸应该彼刚确:
在增量的过程中,妨料的性能不应该祓得列的结果所影响。
因此,结果的准确性依赖于肘间增量的丸小。
因此,你能通过PENWDT来抄制程序中的肘间增量。
)
Definingfieldvariables义场变量)
BeforeusersubroutineUSDFLDiscalled,thevaluesofthefieldvariablesatthematerialpointarecalculatedbyinterpolationfromthevaluesdefinedatthenodes.Anychangestothefieldvariablesintheusersubroutinearelocaltothematerialpoint:
thenodalfieldvariablesretainthevaluesdefinedasinitialconditions,predefinedfieldvariables,orinusersubroutineUFIELD.Thevaluesofthefieldvariablesdefinedinthisroutineareusedtocalculatevaluesofmaterialpropertiesthataredefinedtodependonfieldvariablesandarepassedintootherusersubroutinesthatarecalledatthematerialpoint,suchasthefollowing:
CA-f程序USDFLD拔调用之前,通过节点中龙义的数值采用麦值法计算出材料点的场雯量。
子程序中场变量的任意改动都是柱材料点上的改动:
节点场雯量保特着数值彼岌义为初始状态(预岌义场变量丿,或者使用子程序UFIELD.程序中场变量的值被用来计算材料的性能,材料的特性彼龙义依赖于场变量,并且亦其他孑程存中彼调用。
例如下面的程存:
丿
•CREEP
•HETVAL
•UEXPAN
•UHARD
•UHYPEL
•UMAT
•UMATHT
UTRS
Outputoftheuser-definedfieldvariablesatthematerialpointscanbeobtainedwiththeelementintegrationpointoutputvariableFV(see°Abaqus/Standardoutputvariableidentifiers/*Section4.2.1oftheAbaqusAnalysisUser'sManual).
Accessingmaterialpointdata(it料存舖点数据)
Youareprovidedwithaccesst