在LSPrepost建立sph模型的详细过程.docx

在LSPrepost建立sph模型的详细过程.docx

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在LSPrepost建立sph模型的详细过程

LS_Prepost关键操作

1.模型建立

立方体模型

球体模型

圆柱体模型

圆台/锥模型

2.参数定义

*DATABASE_FORMAT计算结果输出格式

IFORMOutputformatforD3PLOTandD3THDTfiles

EQ.0:

LS-DYNAdatabaseformat（default）,

EQ.1:

ANSYSdatabaseformat,

EQ.2:

BothLS-DYNAandANSYSdatabaseformats.

IBINARYWordsizeofthebinaryoutputfiles（D3PLOT,D3THDT,D3DRLFand

interfacefilesfor64bitcomputersuchasCRAYandNEC.

EQ.0:

default64bitformat,

EQ.1:

32bitIEEEformat

Remarks:

1.Thisoptionisnotavailableforeveryplatform.CheckLS-DYNABanneruponexecutionoftheprogram

2.Byusingthisoptiononecanreducethesizeofthebinaryoutputfileswhicharecreatedby64bitscomputersuchasCRAYandNEC.二进制

*DATABASE_EXTENT_BINARY结果输出控制

NEIPHNumberofadditionalintegrationpointhistoryvariableswrittentothebinarydata-baseforsolidelements.Theintegrationpointdataiswritteninthesameorderthatitisstoredinmemory-eachmaterialmodelhasitsownhistoryvariablesthatarestored.Foruserdefinedmaterialsitisimportanttostorethehistorydatathatisneededforplottingbeforethedatawhichisnotofinterest.

给实体单元增加附加综合的点历史变量二进制数据库，综合点数据目的是储存记忆每个材料模型使它拥有自己的历史变量。

对于使用者而言，定义材料对于储存历史数据是很重要的，在数据储存前需要对其进行描绘。

NEIPSNumberofadditionalintegrationpointhistoryvariableswrittentothebinarydata-baseforbothshellandthickshellelementsforeachintegrationpoint,seeNEIPHabove.

给薄壳和厚壳单元增加附加综合的点历史变量二进制数据库，看下面的NEIPH。

MAXINTNumberofshellintegrationpointswrittentothebinarydatabase,seealso*INTEGRATION_SHELL.Ifthedefaultvalueof3isusedthenresultsareoutputfortheoutermost（top）andinnermost（bottom）integrationpointstogetherwithresultsfortheneutralaxis.IfMAXINTissetto3andtheelementhas1integrationpointthenallthreeresultswillbethesame.Ifavalueotherthan3isusedthenresultsforthefirstMAXINTintegrationpointsintheelementwillbeoutput.Note:

IftheelementhasanevennumberofintegrationpointsandMAXINTisnotsetto3thenyouwillnotgetmid-surfaceresults.SeeRemarksbelow.

壳单元附加综合的点历史变量二进制数据库，可以参看*INTEGRATION_SHELL.

如果采用默认值3，则结果输出的是最远（高）和最近（下）的综合点，结果包含中间轴坐标。

如果设置为3，单元有一个综合点，则三个结果将相同。

如果值超过3，则在单元中的第一个MAXINT综合点将会被输出。

注意：

如果单元拥有一系列综合点，而MAXINT没有被设置成3，则你将无法获得中间表面结果值，详见下面的附注。

STRFLGSetto1todumpstraintensorsforsolid,shellandthickshellelementsforplottingbyLS-PREPOSTandASCIIfileELOUT.Forshellandthickshellelementstwotensorsarewritten,oneattheinnermostandoneattheoutermostintegrationpoint.Forsolidelementsasinglestraintensoriswritten.

SIGFLGFlagforincludingstresstensorintheshellLS-DYNAdatabase:

EQ.1:

include（default）,

EQ.2:

exclude.

EPSFLGFlagforincludingtheeffectiveplasticstrainsintheshellLS-DYNAdatabase:

EQ.1:

include（default）,

EQ.2:

exclude.

RLTFLGFlagforincludingstressresultantsintheshellLS-DYNAdatabase:

EQ.1:

include（default）,

EQ.2:

exclude.

ENGFLGFlagforincludingshellinternalenergydensityandthicknessintheLSDYNAdatabase:

EQ.1:

include（default）,

EQ.2:

exclude.

CMPFLGOrthotropicandanisotropicmaterialstressandstrainoutputinlocalmaterialcoordinatesystemforsolids,shellsandthickshells.

EQ.0:

global,

EQ.1:

local.

IEVERPEveryplotstatefor“d3plot”databaseiswrittentoaseparatefile.Thisoptionwilllimitthedatabaseto1000states:

EQ.0:

morethanonestatecanbeoneachplotfile,

EQ.1:

onestateonlyoneachplotfile.

BEAMIPNumberofbeamintegrationpointsforoutput.Thisoptiondoesnotapplytobeamsthatusearesultantformulation.

DCOMPDatacompressiontoeliminaterigidbodydata:

EQ.1:

off（default）,norigidbodydatacompression,

EQ.2:

on,rigidbodydatacompressionactive,

EQ.3:

off,norigidbodydatacompression,butnodalvelocitiesandaccelerationsareeliminatedfromthedatabase.

EQ.4:

on,rigidbodydatacompressionactiveandnodalvelocitiesandaccelerationsareeliminatedfromthedatabase.

SHGEOutputshellhourglassenergydensity:

EQ.1:

off（default）,nohourglassenergywritten,

EQ.2:

on.

STSSZOutputshellelementtimestep,mass,oraddedmass:

EQ.1:

off（default）,

EQ.2:

outputtimestepsize,

EQ.3:

outputmass,addedmass,ortimestepsize.Seeremark3below.

N3THDTMaterialenergywriteoptionforD3THDTdatabase

EQ.1:

off,energyisNOTwrittentoD3THDTdatabase,

EQ.2:

on（default）,energyiswrittentoD3THDTdatabase.

IALEMATOutputsolidpartIDlistcontainingalematerials.

EQ.1:

on（default）

NINTSLDNumberofsolidelementintegrationpointswrittentotheLS-DYNAdatabase.Thedefaultvalueis1.ForsolidswithmultipleintegrationpointsNINTSLDmaybesetto8.Currently,noothervaluesforNINTSLDareallowed.Forsolidswithmultipleintegrationpoints,anaveragevalueisoutputifNINTSLDissetto1.

PKP_SENFlagtooutputthepeakpressureandsurfaceenergycomputedbyeachcontactinterfaceintotheinterfaceforcedatabase.Toobtainthesurfaceenergy,FRCENG,mustbesentto1onthecontrolcontactcard.WhenPKP_SEN=1,itispossibletoidentifytheenergiesgeneratedontheupperandlowershellsurfaces,whichisimportantinmetalformingappli-cations.ThisdataismappedaftereachH-adaptiveremeshing.

EQ.0:

Nodataiswritten

EQ.1:

Outputthepeakpressuresandsurfaceenergybycontactinterface

SCLPAscalingparameterusedinthecomputationofthepeakpressure.Thisparameterisgenerallysettounity（thedefault）,butitmustbegreaterthan0.

MSSCLOutputnodalinformationrelatedtomassscalingintotheD3PLOTdatabase.ThisoptioncanbeactivatedifandonlyifDT2MS<0.0,seecontrolcard*CONTROL_TIMESTEP.ThisoptionisavailablestartingwiththesecondreleaseofVersion971.

EQ.0:

Nodataiswritten

EQ.1:

Outputincrementalnodalmass

EQ.2:

Outputpercentageincreaseinnodalmass

THERMOutputofthermaldatatod3plot.Theuseofthisoption（THERM>0）maymakethedatabaseincompatiblewithother3rdpartysoftware.

EQ.0:

（default）outputtemperature

EQ.1:

outputtemperature

EQ.2:

outputtemperatureandflux

EQ.3:

outputtemperature,flux,andshellbottomandtopsurfacetemperature

Remarks:

1.IfMAXINTissetto3thenmid-surface,inner-surfaceandouter-surfacestressesareoutputatthecenteroftheelementtotheLS-DYNAdatabase.Foranevennumberofintegrationpoints,thepointsclosesttothecenterareaveragedtoobtainthemidsurfacevalues.Ifmultipleintegrationpointsareusedintheshellplane,thestressesatthecenteroftheelementarefoundbycomputingtheaverageofthesepoints.ForMAXINTequalto3LS-DYNAassumesthatthedatafortheuserdefinedintegrationrulesareorderedfrombottomtotopevenifthisisnotthecase.IfMAXINTisnotequalto3,thenthestressesatthecenteroftheelementareoutputintheorderthattheyarestoredfortheselectedintegrationrule.Ifmultiplepointsareusedinplanethestressesarefirstaveraged.

2.BeamstressesareoutputtotheLS-DYNAdatabaseifandonlyifBEAMIPisgreaterthan

zero.Inthislattercasethedatathatisoutputiswritteninthesameorderthattheintegrationpointsaredefined.Thedataateachintegrationpointconsistsofthefollowingfivevaluesforelastic-plasticHughes-Liubeams:

thenormalstress,?

rr;thetransverseshearstresses,?

rsand?

tr;theeffectiveplasticstrain,andtheaxialstrainwhichislogarithmic.Forbeamsthatarenotelastic-plastic,thefirsthistoryvariable,ifany,isoutputinsteadoftheplasticstrain.ForthebeamelementsofBelytschkoandhiscoworkers,thetransverseshearstresscomponentsarenotusedintheformulation.NodataisoutputfortheBelytschko-Schwerresultantbeam.

3.Ifmassscalingisactive,theoutputofthetimestepsizerevealslittleinformationaboutthecalculation.Ifglobalmassscalingisusedforaconstanttimestep,thetotalelementmassisoutput;however,ifthemassisincreasedsothataminimumtimestepsizeismaintained（DT2MSisnegative）,theaddedmassisoutput.Also,seethecontrolcard*CONTROL_TIMESTEP.

*DATABASE_BINARY_D3PLOT结果输出时间步长

DTTimeintervalbetweenoutputs.

CYCLOutputintervalintimesteps（atimestepisacycle）.FortheD3DRFLfileapositivenumber'n'willcauseplotdumpstobewrittenateveryn'thconvergencecheckintervalspeci-fiedonthe*CONTROL_DYNAMIC_RELAXATIONcard.

NRNumberofRunningRestartFiles,RUNRSF,writteninacyclicalfashion.Thedefaultnumberisone,i.e.thesamefileisoverwritteneachtime.

LCDTOptionalloadcurveIDspecifyingtimeintervalbetweendumps.ThisoptionisonlyavailablefortheD3PLOT,D3PART,D3THDTandINTFORfiles.

BEAMOptionflagfor*DATABASE_BINARY_D3PLOTorD3PART.

EQ.0:

DiscretespringanddamperelementsareaddedtotheD3PLOTorD3PARTdatabasewheretheyaredisplayasbeamelements.TheelementglobalX,globalY,globalZandresultantforcesarewrittentothedatabase,

EQ.1:

NodiscretespringanddamperelementsareaddedtotheD3PLOTorD3PARTdatabase.ThisoptionisusefulwhentranslatingoldLS-DYNAinputdeckstoKEYWORDinput.InolderinputdecksthereisnorequirementthatbeamandspringelementshaveuniqueID's,andbeamelementsmaybecreatedforthespringanddamperswithidenticalID'stoexist-ingbeamelementscausingafatalerror.ContactinterfaceswhicharebasedonpartIDsofseat-beltelementswillnotbeproperlygeneratedifthisoptionisused.EQ.2:

DiscretespringanddamperelementsareaddedtotheD3PLOTorD3PARTdatabasewheretheyaredisplayedasbeamelements（similartooption0）.Inthisoptiontheelementresultantforceiswrittentoitsfirstdatabasepositionallowingbeamaxialforcesandspringresultantforcestobeplottedatthesam