用于碰撞被动安全性分析FEM建模培训手册.pdf

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1、用于碰撞被动安全性CAE分析FEM建模手册车身模型建模要求一般要求GeneralRequirements1.Thepartsshallbemodelledusinglinear(3or4noded)shellelements.2.Thepartsshallbemodelledonthemidsurface.Ifthedeliveredgeometryisnotamidsurfacerepresentation,thegeometryshallbemodifiedtorepresentthemid

2、surface.3.Noelementsareallowedtocrossthe“symmetry”liney=0(nodesshallbepositionedony=0)4.Theshellelementsshallbeconsistentlydefined.5.Thepartsshallbemodelledinthefollowingunitsettings:•Lengthinmillimetres(mm)•Timeinsecond(s)•Massintonne•ForceinNewton6

3、.EachpartshallhaveoneuniquePID,withthefollowingexceptions:•PartsmadeoftailoredblanksshallbedividedintodifferentPIDsaccordingtothedifferentthicknessandmaterialqualitiesoftheparts.•ExtrudedpartsshallbedividedintodifferentPIDsaccordingtothedifferentthic

4、knessandmaterialsofextrusion.•Thethicknessatdifferentlocationsonacast/mouldedpart7.Thepreferrednamingconventionasbelow:ST3700=1234567_A1A_3.5_B-Pillarmaterialdrawingnodrawingrevthicknesspartname8.Allpartswithidenticalmaterialspropertiesshallrefertoth

5、esameMID.9.Onemodelshallbeusedforallcrashsimulation1建模要求MeshingGuideline1.Deformationareashallbemeshwithaaveragelength10mm.Deformationareashallbemeshwithaminimumlengthofnotlessthan5mm.Maximumlengthshallnotexceed12mm.注：变形区域：正面碰撞：A柱与B柱中间位置以前的所有零件及其某些零件

6、的前部（车门除外），另外前端吸能部件，包括纵梁前段、翼子板支撑结构等的平均单元长度为8mm；侧面碰撞：前后从A柱至C柱（包括A柱与C柱），横向左半部所有零件及其某些零件的左半部（框内的零件及其某些零件的框内部分）；2背面碰撞：C立柱（包括C立柱）以后的所有零件及其某些零件的后部（车门除外）。2.Noneformationareashallbemeshwithaaveragelength15mm.Allpartsshallbemeshwithaminimumlengthofnotlessthan5

7、mm.Maximumlengthshallnotexceed18mm.3.NopenetrationsareallowedintheFEmodel.FEmodeshallbeglobalpenetrationcheck.(partthicknessscaleis0.65.)4.Elementtype:QUAD4andTRIA3(max10%ofthefullmodel)5.ElementCheck:Aspectratio<3.0Skewness<60Warping<15CrashTimeStep

8、*＞8.1e-07InternalAngleMinMaxQUAD40140TRIA30120Jacobian>0.5*CrashtimestepforpartB-pillarsystem,longitudinal,bumpersystemis6.0e-7•Thepartshallbecompletelymeshed.Un-meshedareasshallnotexist•A“freeedge”checkshallbeperformedtoverifythatthereareno”cracks”i