HyperView应力显示解释复习进程.docx
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HyperView应力显示解释复习进程.docx
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HyperView应力显示解释复习进程
HyperView应力显示解释
NodalAveragingofElementalResults
Nodalaveragingofelementalresultsatanodereferstotheaverageofalltheelementcornerresultspassingthroughthatnode. Ifnocornerresultsareavailableforanelement,centroidalresultswillbeusedcalculatethenodalaverage. Intheexamplefigurebelow,fourelementsarepassingthroughNode400. TheaverageresultsatNode400isequalto:
whenUsecornerdataisturnedon.
whenUsecornerdataisturnedoff.
NodalaveragingoptionsareselectedfromtheAveragingmethoddrop-downmenuontheContourandIsoValuepanels. Theoptionsare:
•
Simple
•
Advanced
•
Difference
如果取none,就是对计算结果不进行光滑处理。
如果取average,有simple,advanced等几种方法,其中simple和advance的结果差异非常小,difference的应力结果通常会比simple,advance的要大一些,一般使用simple就可以了。
取平滑和不取平滑,应力结果差别比较大,但对位移结果没有什么影响。
通常情况下,把应力结果进行光滑后,应力值会下降一些。
在实际工作中,通常都是取光滑后的应力结果,这样的结果更接近结构的真实受力。
SimpleAveraging
Simpleaveragingmeansthattensorandvectorcomponentsareextractedandtheinvariantsarecomputedpriortoaveraging. Forcomponents,thecorrespondingcomponentsfromeachelementcornerareextractedandthentheyareaveraged. Forinvariants,thecorrespondinginvariantsarecalculatedfromeachtensorattheelementcornersandthenaveraged.
Forexample,asshowninNodalAveragingofElementalResults,therearefourtensors,[A2],[B1],[C3],and[D4]atfourcornersatNode400.
TheaverageofthexxcomponentatNode400is
FortheaverageofaninvariantsuchasvonMises,thevonMisesvalueforalltensor[A2],[B1],[C3],and[D4]arecomputed,thentheyareaveragedasfollows:
Theaveragingmethodsforsolidelementsandshellelementsaredifferent.
AdvancedAveraging
Advancedaveragingmeansthattensor(orvector)resultsaretransformedintoaconsistentsystemandtheneachcomponentisaveragedseparatelytoobtainanaveragetensor(orvector).Theinvariantsarecalculatedfromthisaveragedtensor.Theconsistentsystemcanbetheglobalortheuser-definedsystemforsolidelements.Forshellelements,theconsistentsystemisthenodalprojectionsystem,whichistheprojectedglobaloruser-definedsystemonthenodalprojectionplane(describedintheProjectionrule). IntheexampleshowninNodalAveragingofElementalResults,theaveragedtensoratnode400is:
Where,
aretensorstransformedtothereferencesystemforcornersA2,B1,C3,andD4,respectively.
Thecomponentsareextractedandtheinvariantsarecomputedfromthisaveragedtensororvector
.
Theaveragingmethodsforsolidelementsandshellelementsaredifferent.
Thenodaldifferenceisthedifferencebetweenthemaximumandminimumcornerresultsatanode.Fortensor/vectorcomponents,thecorrespondingcomponentsfromeachelementcornerareextractedandthedifferenceiscalculated. Forinvariants,thecorrespondinginvariantsarecomputedfromeachelementcornerandthenthedifferenceiscalculated.
Thesignofavalueisconsideredinthedifferencecalculation. Forexample,thedifferenceforthevalues,200,400,-100,and-500is900.
IntheexampleshowninNodalAveragingofElementalResults,thenodaldifferenceoftensorcomponentxxatnode400is:
Where
Thedifferencecalculationmethodsforsolidelementsandshellelementsaredifferent.
cornerdata:
Ifcornerdataisavailable,theUsecornerdataoptionisenabled. Ifyouactivatetheoption,HyperViewdisplayscolorbandsbyinterpolatingavailablecornerresultswithineachelement. Adiscontinuityoftheresultdistributionacrosselementboundariescanbeseen.
variation
Therelativedifferenceatanodefromcorrespondingcornervalueswithrespecttothevaluerangefromallnodesintheselectedcomponents.
Ifthevariationintheresultsissmallerthanthespecifiedpercentage,HyperViewwillaveragethecornerresultstothenodes. Ifthevariationislargerthanthespecifiedpercentage,HyperViewwillkeepthediscontinuityoftheresults.
ElementType
ReferenceSystem
ProjectionRule
Solid
Global
N/A
Allcorrespondingtensorsandvectorsaretransformedtotheglobalcoordinatesystemandthenacomponentorinvariantisaveragedasexplainedabove.
Analysis
N/A
Allcorrespondingtensorsandvectorsareleftintheiroriginalcoordinatesystem(notransformationoccurs)andthenacomponentorinvariantisaveragedasexplainedabove. Inthiscase,eachparticipatingelementresultcanbeinadifferentsystem. Simpleaveragingforcomponentsignoresvariationsinsystems. Sinceinvariancedoesnotdependonthecoordinatesystem,allreferencesystemswillproducethesameresultsforinvariants.
Elemental
N/A
Allcorrespondingtensorsandvectorsaretransformedtotheelementalcoordinatesystemandthenacomponentorinvariantisaveragedasexplainedabove. Inthiscase,eachparticipatingelementresultcanalsobeinadifferentsystem. Simpleaveragingforcomponentsignoresvariationsinsystems. Sinceinvariancedoesnotdependonthecoordinatesystem,allreferencesystemswillproducethesameresultsforinvariants.
User-defined
N/A
Allcorrespondingtensorsandvectorsaretransformedtotheuser-definedcoordinatesystemandthenacomponentorinvariantisaveragedasexplainedabove.
Shell
Global
ON
Allcorrespondingtensorsandvectorsaretransformedtotheprojectedsystem(followingtheprojectionrule)oftheparticipatingelementsandthenthecomponentorinvariantsareaveragedasexplainedabove.
Asaresult,evenifthereferencesystemisthesame,theprojectedsystemsinparticipatingelementscanbedifferent. Simpleaveragingforcomponentsignoresvariationsinsystems.
OFF
Allcorrespondingtensorsandvectorsaretransformedtotheglobalcoordinatesystemandacomponentorinvariantisthenaveragedasexplainedabove.
Analysis
N/A
Allcorrespondingtensorsandvectorsareleftintheiroriginalcoordinatesystem(notransformationoccurs)andthenacomponentorinvariantisaveragedasexplainedabove. Inthiscase,eachparticipatingelementresultcouldbeinadifferentsystem.Simpleaveragingforcomponentsignoresvariationsinsystems. Sinceinvariancedoesnotdependonthecoordinatesystem,allreferencesystemswillproducethesameresultsforinvariants.
Elemental
N/A
Allcorrespondingtensorsandvectorsaretransformedtotheelementalcoordinatesystemandthenacomponentorinvariantisaveragedasexplainedabove. Inthiscase,eachparticipatingelementresultcouldalsobeinadifferentsystem. Simpleaveragingforcomponentsignoresvariationsinsystems. Sinceinvariancedoesnotdependonthecoordinatesystem,allreferencesystemswillproducethesameresultsforinvariants.
User-defined
ON
Allcorrespondingtensorsandvectorsaretransformedtotheprojectedsystem(followingtheprojectionrule)oftheparticipatingelementsandthenthecomponentorinvariantsareaveragedasexplainedabove.
Asaresult,evenifthereferencesystemisthesametheprojectedsystemsinparticipatingelementscanbedifferent. Simpleaveragingforcomponentsignoresvariationsinsystems.
OFF
AllcorrespondingtensorsandvectorsaretransformedtotheUser-definedcoordinatesystemandacomponentorinvariantisthenaveragedasexplainedabove.
Validreferencecoordinatesystem:
All(Global,Analysis,Elemental,andUser-defined)
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