abaqus中实体单元的内力提取方法汇总.docx

abaqus中实体单元的内力提取方法汇总.docx

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abaqus中实体单元的内力提取方法汇总

实体单元建的模型，要提取截面的内力有什么好方法呢？

我看过别人的一个帖：

对于一般的实体单元结构

可以定义surface然后用sectionfile输出

其中，这个surface可以在cae中定义，也可以在inp中定义，但是由于涉及到边的编号问题，所以在inp中容易出错。

sectionfile的结果直接在dat中可见。

需要编制小程序将其数据提取。

？

一定要编个程序才可以提取吗？

在dat文件里没有找到什么

sectionfile是输出在*.fil文件中。

要直接得到截面的totalforce，moment，heatflux可以在inp中添加：

*SECTIONPRINT,name=*,surface=**

SOF,SOM

在dat文件中可以找到总内力和弯矩

我做钢筋混凝土的问题，模型分为两个part，分别是钢筋和混凝土，然后Assembe在一起，将钢筋embeded到混凝土内。

我在keywords编辑器Endassemble前定义

*surface,type=cuttingsurface,name=surface_1

-21.5,0,0,1,0,0

怎么也不成，总说定义的截面没有相交（坐标计算没有错误）。

第三行空着（帮助文档说表示截断整个模型）也不行，写上钢筋或混凝土的单元组名（没有另建组，直接用的keywords编辑器中钢筋或混凝土生成单元的组名）也不行。

请问是怎么回事？

哪位有相关的例子给我一个，我的QQ：

40735053。

还望不吝赐教，谢谢。

Displayingafreebodycut

Youcandefineafreebodycuttoviewtheresultantforcesandmomentstransmittedacrossaselectedsurfaceofamodel.Forcevectorsaredisplayedwithasinglearrowheadandmomentvectorswithadoublearrowhead.

Tocreateafreebodycut:

1.Todisplaytheentiremodelintheviewport,select Tools

DisplayGroup

Plot

All fromthemainmenubar.

2.Fromthemainmenubar,select Tools

FreeBodyCut

Manager.

3.Click Create inthe FreeBodyCutManager.

4.Fromthedialogboxthatappears,select 3Delementfaces asthe Selectionmethod andclick Continue.

5.Inthe FreeBodyCross-Section dialogbox,select Surfaces asthe Item and Pickfromviewport astheMethod.

6.Inthepromptarea,settheselectionmethodto byangle andacceptthedefaultangle.

7.Selectthesurface,highlightedin Figure4–33,todefinethefreebodycutcross-section.

a.Fromthe Selection toolbar,toggleoffthe SelecttheEntityClosesttotheScreen tool 

 andensurethatthe SelectFromAllEntities tool 

 isselected.

b.Asyoumovethecursorintheviewport,Abaqus/CAEhighlightsallofthepotentialselectionsandaddsellipsismarks（...）nexttothecursorarrowtoindicateanambiguousselection.Positionthecursorsothatoneofthefacesofthedesiredsurfaceishighlighted,andclicktodisplaythefirstsurfaceselection.

Figure4–33 Selectedfacesforthefreebodycross-section.

c.Usethe Next and Previous buttonstocyclethroughthepossibleselectionsuntiltheappropriateverticalsurfaceishighlighted,andclick OK.

8.Click Done inthepromptareatoindicateyourselectioniscomplete.Click OK inthe FreeBodyCross-Sectiondialogbox.

9.Inthe EditFreeBodyCut dialogbox,acceptthedefaultsettingsforthe SummationPoint andtheComponentResolution.Click OK toclosethedialogbox.

10.Click Options inthe FreeBodyCutManager.

11.Fromthe FreeBodyPlotOptions dialogbox,selectthe Force tabinthe Color&Style tabbedpage.Clicktheresultantcolorsample 

 tochangethecoloroftheresultantforcearrow.

12.Onceyouhaveselectedanewcolorfortheresultantforcearrow,click OK inthe FreeBodyPlotOptions dialogboxandclick Dismiss inthe FreeBodyCutManager.

Thefreebodycutisdisplayedintheviewport,asshownin Figure4–34.

Figure4–34 Freebodycutdisplayedontheconnectinglug.

Generatingtabulardatareportsforsubsetsofthemodel

Tabularoutputdataweregeneratedearlierforthismodelusingprintedoutputrequests.However,forcomplicatedmodelsitisconvenienttowritethesedataforselectedregionsofthemodelusingAbaqus/Viewer.Thisisachievedusingdisplaygroupsinconjunctionwiththereportgenerationfeature.Fortheconnectinglugproblemwewillgeneratethefollowingtabulardatareports:

∙Stressesintheelementsatthebuilt-inendofthelug（todeterminethemaximumstressinthelug）

∙Reactionforcesatthebuilt-inendofthelug（tocheckthatthereactionforcesattheconstraintsbalancetheappliedloads）

∙Verticaldisplacementsatthebottomofthehole（todeterminethedeflectionofthelugwhentheloadisapplied）

Eachofthesereportswillbegeneratedusingdisplaygroupswhosecontentsareselectedintheviewport.Thus,beginbycreatingandsavingdisplaygroupsforeachregionofinterest.

Tocreateandsaveadisplaygroupcontainingtheelementsatthebuilt-inend:

1.IntheResultsTree,double-click DisplayGroups.

2.Choose Elements fromthe Item listand Pickfromviewport astheselectionmethod.

3.Restoretheoptiontoselectentitiesclosesttothescreen.

4.Inthepromptarea,settheselectionmethodto byangle;andclickthebuilt-infaceofthelug.Click Done whenalltheelementsatthebuilt-infaceofthelugarehighlightedintheviewport.Inthe CreateDisplayGroup dialogbox,click Replace 

 followedby SaveAs.Savethedisplaygroupas built-inelements.

Tocreateandsaveadisplaygroupcontainingthenodesatthebuilt-inend:

1.Inthe CreateDisplayGroup dialogbox,choose Nodes fromthe Item listand Pickfromviewport astheselectionmethod.

2.Inthepromptarea,settheselectionmethodto byangle;andclickthebuilt-infaceofthelug.Click Done whenallthenodesonthebuilt-infaceofthelugarehighlightedintheviewport.Inthe CreateDisplayGroup dialogbox,click Replace 

 followedby SaveAs.Savethedisplaygroupas built-innodes.

Tocreateandsaveadisplaygroupcontainingthenodesatthebottomofthehole:

1.Inthe CreateDisplayGroup dialogbox,select All fromtheitemlist,andclick Replace 

 toresettheactivedisplaygrouptoincludetheentiremodel.

2.Inthe CreateDisplayGroup dialogbox,choose Nodes fromthe Item listand Pickfromviewport astheselectionmethod.

3.Inthepromptarea,settheselectionmethodto individually;andselectthenodesatthebottomoftheholeinthelug,asindicatedin Figure4–35.Click Done whenallthenodesonthebottomoftheholearehighlightedintheviewport.Inthe CreateDisplayGroup dialogbox,click Replace 

 followedby SaveAs.Savethedisplaygroupas nodesatholebottom.

Figure4–35 Nodesindisplaygroup nodesatholebottom.

Nowgeneratethereports.

Togeneratefielddatareports:

1.IntheResultsTree,clickmousebutton3on built-inelements underneaththe DisplayGroups container.Inthemenuthatappears,select Plot tomakeitthecurrentdisplaygroup.

2.Fromthemainmenubar,select Report

FieldOutput.

3.Inthe Variable tabbedpageofthe ReportFieldOutput dialogbox,acceptthedefaultpositionlabeledIntegrationPoint.Clickthetrianglenextto S:

Stresscomponents toexpandthelistofavailablevariables.Fromthislist,select Mises andthesixindividualstresscomponents:

 S11, S22, S33, S12, S13,and S23.

4.Inthe Setup tabbedpage,namethereport Lug.rpt.Inthe Data regionatthebottomofthepage,toggleoffColumntotals.

5.Click Apply.

6.IntheResultsTree,clickmousebutton3on built-innodes underneaththe DisplayGroups container.Inthemenuthatappears,select Plot tomakeitthecurrentdisplaygroup.（Toseethenodes,toggleon Shownodesymbols inthe CommonPlotOptions dialogbox.）

7.Inthe Variable tabbedpageofthe ReportFieldOutput dialogbox,changethepositionto UniqueNodal.Toggleoff S:

Stresscomponents,andselect RF1, RF2,and RF3 fromthelistofavailable RF:

Reactionforcevariables.

8.Inthe Data regionatthebottomofthe Setup tabbedpage,toggleon Columntotals.

9.Click Apply.

10.IntheResultsTree,clickmousebutton3on nodesatholebottom underneaththe DisplayGroups container.Inthemenuthatappears,select Plot tomakeitthecurrentdisplaygroup.

11.Inthe Variable tabbedpageofthe ReportFieldOutput dialogbox,toggleoff RF:

Reactionforce,andselectU2 fromthelistofavailable U:

Spatialdisplacement variables.

12.Inthe Data regionatthebottomofthe Setup tabbedpage,toggleoff Columntotals.

13.Click OK.

Openthefile Lug.rpt inatexteditor.Aportionofthetableofelementstressesisshownbelow.Theelementdataaregivenattheelementintegrationpoints.Theintegrationpointassociatedwithagivenelementisnotedunderthecolumnlabeled IntPt.Thebottomofthetablecontainsinformationonthemaximumandminimumstressvaluesinthisgroupofelements.TheresultsindicatethatthemaximumMisesstressatthebuilt-inendisapproximately330MPa.Yourresultsmaydifferslightlyifyourmeshisnotidenticaltotheoneusedhere.

*SECTIONPRINT

Defineprintrequestsofaccumulatedquantitiesonuser-definedsurfacesections.

Thisoptionisusedtoprovidetabularoutputofaccumulatedquantitiesassociatedwithauser-definedsection.Dependingontheanalysistypetheoutputmayincludeoneorseveralofthefollowing:

thetotalforce,thetotalmoment,thetotalheatflux,thetotalcurrent,thetotalmassflow,orthetotalporefluidvolumefluxassociatedwiththesection.Thisoptionisnotavailableforeigenfrequencyextraction,eigenvaluebucklingprediction,complexeigenfrequencyextraction,orlineardynamicsprocedures.

Product:

 Abaqus/Standard  

Type:

 Historydata

Level:

 Step

References:

∙“Outputtothedataandresultsfiles,” Section4.1.2oftheAbaqusAnalysisUser'sManual

∙“Abaqus/Standardoutputvariableidentifiers,” Section4.2.1oftheAbaqusAnalysisUser'sManual

Requiredparameters:

NAME

Setthisparameterequaltoalabelthatwillbeusedtoidentifytheoutputforthesection.Sectionnamesinthesameinputfilemustbeunique.

SURFACE

Setthisparameterequaltothenameusedinthe *SURFACE optiontodefinethesurface.

Optionalparameters:

AXES

Set AXES=LOCAL ifoutputisdesiredinthelocalcoordinatesystem.Set AXES=GLOBAL （default）tooutputquantitiesintheglobalcoordinatesystem.

FREQUENCY

Setthisparameterequaltotheoutputfrequency,inincrements.TheoutputwillalwaysbeprintedatthelastincrementofeachstepunlessFREQUENCY=0.Thedefaultis FREQUENCY=1.Set FREQUENCY=0tosuppresstheoutput.

UPDATE

Set UPDATE=NO ifoutputisdesiredintheoriginallo