LS-DYNA中的接触理论讲解

1CoulcombLS-DYNALS-DYNA-2slavemastersegmentslavenodesmastersegment(TiedContactsslave)———3LS-DYNA‹kinematicconstraintmethod‹penaltymethod‹distributedparametemethod3.1KinematicConstraintMethodHughes1976HallquitDYNA2|DDYNA3Dt(mastersurface)(slavenode)tttmasternode(slavesurface)(Kink)LS-DYNA3.2DistributedParameterMethodWilkins1964HEMPBurton1982TENSORDYNALS-DYNA(slaveelement)3.3PenaltyMethod1981Huag19828DYNA2D[2]Hourglassns12Fn34Fn41/2ContactThicknessshellthicknessoffsetspartLS-DYNADYNA0Soft=1LS-DYNACoulombTheoreticalManualofLS-DYNADYNAIncrementalSearchTechniqueBucketSortIncrementalSearchAlgorithmsGlobalBucketSort‹‹IncrementalSearch‹‹LS-DYNA„One-WayContact„Two-WayContact„SingleContact„Entity„TiedContac4.1One-WayTreatmentofContactOne-WayTwo-WayOne-wayTwo-WayContactLS-DYNA_Node_To_Surface_Surface_To_Surfacez*Contact_Nodes_To_surfacez*Contact_Automatic_Nodes_To_Surfacez*Contact_Froming_Nodes_To_Surfacez*Contact_Constraint_Nodes_To_Surfacez*Contact_Eroding_Nodes_To_Surfacez*Contact_One_Way_Surface_To_SurfacezContact_One_Way_Automatic_Surface_To_Surface———beam_to_surfaceShelledge_to_surfacebeamnodeShelledgenode*Contact_Nodes_To_Surface(5)*Contact_One_Way_Surface_To_Surface(10)*Contact_Constraint_Nodes_To_Surface(18)*Contact_Eroding_Nodes_To_Surface(16)4.2Two-WayTreatmentofContact2LS-DYNA_Surface_To_Surface51816*Contact_Surface_To_Surface(3)*Contact_Constraint_Surfaces_To_Surface(17)*Contact_Eroding_Surface_To_Surface(14)CrashAnalysis*Contact_Automatic_Surface_To_Surface(a3)*Contact_Froming_Nodes_To_Surface4.3SingleSurfaceLS-DynaCrashworthinessPartPartSetIDPartPart*Contact_Single_Surface(4)*Contact_Automatic_Single_Surface()*Contact_Automatic_General*Contact_General_Interior*Contact_Airbag_Single_SurfaceCrashAnalysis*Contact_Automatic_Single_Surface(13)DYNA4.4TiedContact(TranslationalDOFonly,NoFailure,NoOffset)§2PartsIDnode/segment‹TranslationalDOFonly,NoFailure,NoOffset*Contact_Tied_Nodes_To_Surface(6)*Contact_Tied_Surface_To_Surface(2)‹TranslationalDOFonly,NoFailure,WithOffset26*Contact_Tied_Nodes_To_Surface_OFFSET(O6)*Contact_Tied_Surface_To_Surface_OFFSET(O2)‹TranslationalDOF&RotationalDOF,WithFailure,NoOffset‹TranslationalDOF&RotationalDOF,WithFailure,WithOffset‹TranslationalDOFOnly,WithFailure,WithOffset5LS-DYNA5.1Penalty-baseApproach(SOFT=0)LS-DYNACrashSOFT=05.2SoftConstraint-basedApproach(SOFT=1&2)Soft=1Soft=0Soft=1kk=max(SLSFAC*SFS*k0,SOFSCL*k1)k0k1Two-WaySFMSFS5.3Segment-basedContactVS.StandardContactSoft=01Soft=2Segmentbased6LS-DYNALS-DYNA*Control_Contact*Contact*Part_Contact*Control_Contact*Contact*Part_ContactPart6.1Thicknessoffset:Automatic,SLTHK(Card1,*Control_Contact,OptionCardA)LS-DYNA9*CONTACT_SURFACE_TO_SURFACE9*CONTACT_NODES_TO_SURFACE9*CONTACT_ONE_WAY_SURFACE_TO_SURFACESHLTHK*CONTROL_CONTACTOptionalCardBSHLTHK=0incrementalsearchSHLTHK=1SHLTHK=2SHLTHK12globalbucketsearchincrementalsearchingglobalbucketsearchingincrementalsearchorientedcontact*CONTROL_CONTACTORIENCrashAnalysis6.2ContactSlidingFriction:FS&FD(Card2)LS-DYNACoulcomb*Contact*Part_ContactFSFDFDFSDCCrashAnalysisFSFD3yVCσ=FSFD6.3PenaltyScaleFactors:SFS&SFM(Card3)SFSSFMSoft=02SFSSFMSLSFAC*Control_ContactSFSSFMSLSFACSoft=0Soft=16.4ContactThickness:SST&MSTCard3SSTMSTSST=MST=0*Section_ShellSSTMSTSSTMST0.60.7ContactThicknessScalingSFST&SFMTSSTMST6.5ViscousDamping:VDC(Card2)VDC40~6040~60%VDC206.6Bucket-SortFrequency:BSORT(OptionalCardA,*Contact)&NSBCS(Card2*Control_Contact)BucketSortBucketSortBSORTBucketSort10100BSORTBSBCS10BSORTNSBCS6.7MaximumPenetrationPENMAX(OptionalcardB,*ControlContact)&XPENE(Card2,*Control_Contact)MaximumPenetrationSHLTHK01.0e20SHLTHK=1or2XPENEzMaxDistanceSolidsXPENEdefault=4.0*thicknessofthesolidelementSHLTHK=1zMaxDistanceSolids0.05*thicknessofthesolidelementSHLTHK=2zMaxDistanceShellsXPENEdefault=4.0*thicknessoftheshellelementSHLTHK=1zMaxDistanceShells0.05*minimumdiagonallengthSHLTHK=2Automatic_GeneralPENMAX0.4zMaxDistance=PENMAX*(thicknessofthesolid)zMaxDistance=PENMAX*(slavethickness+masterthickness)Automatic_GeneralPENMAX200SOFT7LS-DYNARCFORCGlobalCartesianCoordinateSystemASCIIRCFORCk*Database_FCFORCSPRMPRCard1RCFORC*Contact_Force_Transducer_Penaltyforcetransducers*Database_SleoutASCIISLEOUT1)*Database_Binary_Intfor2)SPRMPR3)s=filename8