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1、SECTION10LAGRANGIANBOUNDARYCONDITIONSSINGLEPOINTCONSTRAINT-SPCPreventsapointmovinginaparticulardirection.MustbeinitializedintheCaseControlsection:SPC=SIDAnySPCnentriesnotselectedincasecontrolareignored.Thedisplacementcoordinatesystemoftheconstrainedgridpoi
2、ntdeterminesthedirectionthattheconstraintisappliedin.Canbeusedtomodelboundaryconditionsandplanesofsymmetry.Anycomponentingridcoordinatesystemcanbeconstrained.Componentsinagridcoordinatesystemarereferredbydigits1to6.Anycombinationispossible,e.g.23,156.SPC=1
3、00BEGINBULK...SPC,100,27,123SPC1,100,156,19,THRU,28ROTATIONALBOUNDARYCONDTION–SPC2Usedtomodelrotationalboundaryconditionsongridpoints.MustbeselectedinCaseControlSPC=SIDSINGLEPOINTCONSTRAINTINLOCALCOORDINATES–SPC3Usedtodefineasinglepointconstraintinalocalco
4、ordinatesystemoracascadeoftwolocalcoordinatesystems.MustbeselectedinCaseControl.SPC=SIDENFORCEDMOTIONPrescribesthemotionofgridpoints.Forceofpressureloading-TYPE=2inTLOAD1definition.MustbeselectedinCaseControl.Anyloading(TLOADnentry)notselectedinCaseControl
5、isignored.Enforcedmotioncanbeprescribedinalocalcoordinatesystem.ENFORCEDGRIDPOINTMOTIONSpecifiedpointscanhavetheirvelocityset.Velocity-TYPE=2inTLOAD1definitionTLOAD1,100,110,,2,120DAREAdefinesmagnitudeoftranslationalorangularvelocityperDOF.FORCEdefinesmagn
6、itudeanddirectionoftranslationalvelocity.MOMENTdefinesmagnitudeanddirectionofangularvelocity.Velocitycanvaryarbitrarilywithtime.TheTABLED1entrygivesthevariationofvelocity.TLOAD=100BEGINBULK...TLOAD1,100,110,,2,120TABLED1,120,,,,,,,,++,0.0,0.0,1.0,1.0,ENDTF
7、ORCE,110,27,,-6.0,,1.0ENFORCEDMOTIONFORCEinCORDXXXIfonaFORCEentryaCIDisreferenced,theenforcedmotionisprocessedinalocalcoordinatesystem.FORCE,110,27,2,-6.0,,1.0RIGIDWALLS-WALLModelsarigidplanewhichspecified”slave”pointscannotpenetrate.Usedtomodelhard,undefo
8、rmabletarget.Defineapointonthewallandavectorperpendiculartoit,pointingtowardsthemodel.Twokindsofcontact:PENALTYMethod: Allowedpenetration. Forceincreasesasnodespenetratedeeper. Canhavefriction.KINEMATICMethod
