Q/SZJ191001-2017前罩后邊剛度分析規(guī)范SpecificationOfRearedgeStiffnessAnalysisForHood20XX20XX-06-30實(shí)施20XX-05-29發(fā)布XXXX汽車(chē)工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017前罩后邊剛度分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了前罩后邊剛度分析方法及結(jié)果處理方法。本標(biāo)準(zhǔn)適用于CAE部門(mén)前罩后邊剛度分析。規(guī)范性引用文件無(wú)。術(shù)語(yǔ)和定義無(wú)。流程圖ProcessFlowDiagramYesYesNo前罩CAD模型HoodCADModel前罩FEA模型HoodFEAModel靜力分析StaticAnalysis結(jié)果是否滿足要求？TheresultisOK？結(jié)束End優(yōu)化Optimization圖1流程圖Fig1ProcessFlowDiagram工具描述ToolDescription仿真分析過(guò)程中需要用到的如下軟件:Thefollowingsoftwarefacilitatestheanalyticalsimulationprocess:前處理(Preprocessors):Hypermesh求解器(AnalysisCode):MSC.Nastran后處理(Postprocessors):Hyperview建模和分析過(guò)程Modeling/AnalysisProcedure單位Units分析中所用單位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) 牛頓(N)質(zhì)量(Mass) 噸(Ton)長(zhǎng)度(Length) 毫米(mm)時(shí)間(Time) 秒(Second)內(nèi)容Contents模型包含白前罩、鉸鏈等Hoodinwhite(HIW)withhingeassembly.Hood-in-whiteassembly:Allstructuralparts AdhesiveMasticWeldsMechanicalClinches坐標(biāo)系CoordinateSystems整車(chē)坐標(biāo)系。Vehicleglobalcoordinatesystem.建模技巧ModelingTechniques網(wǎng)格質(zhì)量要求，平均單元尺寸3-8mm，翹曲小于12°，雅克比大于0.6，局部應(yīng)力區(qū)域沒(méi)有三角形單元，關(guān)鍵安裝點(diǎn)周?chē)鷽](méi)有三角形單元，模型三角形單元數(shù)量小于10%，增加一圈washer在螺栓孔上。螺栓用Rbe2+Cbar單元模擬，焊縫用Penta焊縫類(lèi)型模擬，簡(jiǎn)化結(jié)構(gòu)用Rbe3+Mass模擬。Meshqualityrequirements,Averageelementsizeis3to8mm,Warpage<12,Jacobin>0.6,Notrianglesinlocalstressarea,Notriangularelementsaroundkeyfixpoints,Triangleselement<10%,Addonewasherforboltholes.BoltusesRbe2+Cbarelementtosimulate.WeldusesPentatypetosimulate.SimplestructureusesRbe3+Masselementtosimulate.假設(shè)和限制Assumptions/Limitations與物理試驗(yàn)相比較，對(duì)于焊點(diǎn)焊縫失效和材料局部撕裂的地方，分析模型假設(shè)沒(méi)有焊點(diǎn)焊縫失效和材料撕裂。對(duì)于螺紋連接處，假設(shè)分析模型沒(méi)有螺紋失效。Incomparisonwiththephysicaltest,wherespotweldsmailfailandmaterialmaylocallytear,theanalyticalmodelassumesnoweldsfailureandnomaterialtear.Tothescrewingconnection,theanalyticalmodelassumesnoscrewingfailure.載荷和邊界條件Loads/BoundaryConditions約束Constrains：鉸鏈車(chē)身端安裝點(diǎn)全約束1-6，緩沖塊約束3，鉸鏈必須釋放Y向旋轉(zhuǎn)自由度，如圖2所示。BodysidehingeSPC1-6atboltlocations,SPC3atbumper,hingepivotsfreetorotate,asshownfigure2加載Loads：前罩尾端中心位置50*50mm區(qū)域垂向加載，如圖3所示。100Nverticalloadappliedtoouterpanelatcenterofrearedge50*50mmarea,asshownfigure3.圖2前罩約束Fig2HoodConstraints圖3前罩加載Fig3Hoodload結(jié)果Results輸出*.fem;*.bdf;*.dat等格式的文件Output*.fem,*.bdf,*.dat,.ect.formatfiles結(jié)果讀取加載位置內(nèi)板位移，計(jì)算剛度值（F/Z向位移）Determinetheverticaldeflectionmeasuredoninnerpanelbelowloadpoint,Calculatethestiffness(load/Zdeflection).性能要求PerformanceRequireme