Q/SZJ191001-2017白車身強(qiáng)度度分析規(guī)范SpecificationOfStrengthAnalysisForBodyIn-Prime20XX20XX-XX-XX實施20XX-XX-XX發(fā)布XXXX汽車工程技術(shù)有限公司發(fā)布Q/SZXX-X-2017白車身強(qiáng)度分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了術(shù)語和定義、白車身強(qiáng)度分析方法及結(jié)果處理方法。本標(biāo)準(zhǔn)適用于CAE部門白車身強(qiáng)度分析。規(guī)范性引用文件無。術(shù)語和定義本規(guī)范涉及到的術(shù)語及其定義如下：白車身（BIP）帶玻璃的白車身，在本規(guī)范中，部分還包括副車架，CCB等對車身起一定加強(qiáng)作用的零件或總成。摘要Abstract本規(guī)范概要介紹通過計算機(jī)仿真的方法，分析白車身的強(qiáng)度的流程。其目的是確定載荷和邊界條件，并根據(jù)輸入載荷計算應(yīng)力分布情況，識別出關(guān)注部位的風(fēng)險情況。Thisprocedureoutlinestheanalyticaltechniqueviacomputersimulationforstrengthanalysisofabody-in-whitescheduleinputs.Thepurposeistodescribetheloadingandboundaryconditions,toidentifyareasofconcernandtocalculatethestressesdistributionduetotestinputs.流程圖ProcessFlowDiagram準(zhǔn)備準(zhǔn)備強(qiáng)度分析的輸入Gatherinputforstrengthanalysis目標(biāo)達(dá)成？TargetReached?準(zhǔn)備強(qiáng)度分析模型Preparatoryworkonmodel準(zhǔn)備材料信息Preparatoryworkonmaterial準(zhǔn)備載荷信息Preparatoryworkonloading撰寫報告Documentandreport進(jìn)行強(qiáng)度分析Runstrengthanalysis圖1流程圖Fig1ProcessFlowDiagram工具描述ToolDescription仿真分析過程中需要用到的如下軟件:Thefollowingsoftwarefacilitatestheanalyticalsimulationprocess:前處理(Preprocessors):Hypermesh求解器(AnalysisCode):Nastran,Abaqus后處理(Postprocessors):Hyperview建模和分析過程Modeling/AnalysisProcedure建立多體動力學(xué)模型，根據(jù)設(shè)定的工況和整車參數(shù)在輪心或輪胎接地點輸入載荷，經(jīng)多體仿真后提取車身和底盤部件連接點的載荷。建立白車身有限元模型，在與底盤連接點處施加載荷，使用慣性釋放法，進(jìn)行有限元線性靜強(qiáng)度分析。Wheelcenter(thetirecontactpatches)loadsrequiredasaninputtoamulti-bodydynamicssimulationprogramarecalculatedbyusingvehicleglobalparameterssuchascurbmass,grossvehicleweightrating,axleweightratings,wheelbase,andcgheight.TheanalysesusuallystartwithaninertiarelieftypeofstaticstressanalysisbyaFEsolverpackagefortheloadineachofthesuspensionattachmentpoints.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)長度(Length) 毫米(mm)時間(Time) 秒(Second)內(nèi)容Contents分析模型應(yīng)包含以下部件：白車身，開閉件，座椅，CCB，IP，動力總成，乘員和行李。動力總成，乘員和行李可以用質(zhì)量單元模擬。檢查模型質(zhì)量，應(yīng)該和整車簧上質(zhì)量盡可能保持一致。Themodelshouldcontaincomponentsasbelow:Body-in-white,closures,seats,CCB,IP,PT,passengers,luggage.PT,passengersandluggagecanberepresentedbymasselements.Checkthemodelmassandmakeitequalstothevehiclesprungmassaspossible.坐標(biāo)系CoordinateSystems除特殊說明，本規(guī)范一般使用整車坐標(biāo)系。（X軸向后，Y軸向右，Z軸向上）Generally,theglobalvehiclesystemisused.Mathdataforthebody-in-whiteisdesignedinthevehiclecoordinatesystem(ie.X-axisrearward,Y-axisrightandZ-axisupward)建模技巧ModelingTechniques白車身的CAD信息應(yīng)包含以下內(nèi)容：各部件的鈑金件及焊點；各部件的鈑金材料屬性，粘膠和玻璃的材料屬性；各部件的質(zhì)量及質(zhì)心位置。CADinformationofthebody-in-whitestructure:Sheetmetalpartsandtheirweldingpoints;Materialpropertiesofsheetmetalcomponents,glueandglass;Massesandtheircenterofgravitypositions;根據(jù)車身和其他部件的結(jié)構(gòu)設(shè)計，應(yīng)用不同的單元類型建立有限元模型。如部件是鈑金件，用殼單元模擬；如是鑄造，則使用實體單元。Thetypeofelementusedtomodelthebody-in-whiteoranyotherstructuredependsonitsdesign.Ifthecomponentisstampedfromsheetmetal,itshouldbemodeledusingshellelements.Ifitisforgedorcast,thensolidelementsshouldbeused.部件的質(zhì)量，在其質(zhì)心位置通過RBE2單元連接到白車身。Massesareconnectedtothebody-in-white(oranystructure)throughRBE2elementsattheircenterofgravitypositions,astested.假設(shè)和限制Assumptions/Limitations假設(shè)Assumptions就應(yīng)力計算而言：Asfarasstresscalculationsareconcerned:習(xí)慣性使用線彈性理論（NASTRANSOL101求解器）；Customaryassumptionsofthelineartheoryofelasticityareused(NASTRANSol101);材料的性能是在室溫下測定的。Materialperformanceistestedatroomtemperature.限制Limitations由于考察整個車身（非對稱結(jié)構(gòu)）的應(yīng)力，需要建立整車模型。Asasymmetricstructuresareconsidered,awholemodelisnecessaryinordertoassessstressesthroughoutthestructure.載荷和邊界條件Loads/BoundaryConditions邊界條件BoundaryConditions分析采用慣性釋放方法，不需要進(jìn)行任何約束。Theanalysisusesinertiareleasemethod,sothereisnonecessarytoconstrainanycomponent.載荷Loads橫向載荷Lateralloads0.7g橫向右轉(zhuǎn)0.7glateralrightturn0.7g橫向左轉(zhuǎn)0.7glateralleftturn垂向載荷Verticalloads1.0g-1.0g垂向（僅做參考）1.0g-1.0gvertical(referenceloadonly)2.0g-2.0g垂向2.0g-2.0gvertical3.0g-3.0g垂向3.0g-3.0gvertical3.0g-1.0g垂向+2.0g前/后+1.0g-ft左輪心外傾轉(zhuǎn)矩（pothole）3.0g–1.0gverticalwith2.0gfore/aftand1.0g-ftcambermomentattheleftwheelcenteronly(pothole).前向/后向載荷Fore/Aftloads0.8g前向制動（不含緊急制動）0.8gforwardbraking(ExcludingPanicBraking).0.5g后向制動（不含緊急制動）0.5greversebraking(ExcludingPanicBraking).最大前向牽引Maximumforwardtractiveeffort.對角扭轉(zhuǎn)載荷Diagonaltwistloads7英寸對角扭轉(zhuǎn)（左前右后輪心向下，右前左后輪心向上）7inchdiagonaltwist(LFandRRWCdown,RFandLRWCu