在LSPrepost建立sph模型地详细过程.docx
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在LSPrepost建立sph模型地详细过程
LS_Prepost关键操作
1.模型建立
立方体模型
沿三个坐标轴方向的节点数
立方体
起始节点号:
该Part第一个节点号码
粒子密度
Part编号
起始坐标
球体模型
球体半径
球心坐标
球体
沿三个坐标轴方向的节点数
圆柱体模型
轴向节点数
径向节点数,一般设置相同
圆柱高
圆柱半径
底部中心坐标
方向坐标
圆柱
圆台/锥模型
圆台/锥
圆台顶部半径
圆台底部半径
轴向节点数
径向节点数,一般设置相同
圆台高
底部中心坐标
方向坐标
2.参数定义
*DATABASE_FORMAT计算结果输出格式
数据库
输出结果格式
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
数据库
输出二进制结果
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,rsandtr;theeffectiveplasticstrain,andtheaxialstrainwhichislogarithmic.Forbeamsthatarenotelastic-plastic,thefirsthistoryvariable,ifany,isoutputinsteadoftheplasticstrain.ForthebeamelementsofBelytschkoandhiscoworkers,thetransverseshearstresscomponentsarenotusedintheformulation.NodataisoutputfortheBelytschko-Schwerresultantbeam.
3.Ifmassscalingisactive,theoutputofthetimestepsizerevealslittleinformationaboutthecalculation.Ifglobalmassscalingisusedforaconstanttimestep,thetotalelementmassisoutput;however,ifthemassisincreasedsothataminimumtimestepsizeismaintained(DT2MSisnegative),theaddedmassisoutput.Also,seethecontrolcard*CONTROL_TIMESTEP.
数据库
*DATABASE_BINARY_D3PLOT结果输出时间步长
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:
DiscretespringanddamperelementsareaddedtotheD3PLOTorD3PARTdatab