白车身强度分析规范

Q/SZJ191001-2017白车身强度度分析规范SpecificationOfStrengthAnalysisForBodyIn-Prime20XX20XX-XX-XX实施20XX-XX-XX发布XXXX汽车工程技术有限公司发布Q/SZXX-X-2017白车身强度分析规范范围本标准规定了术语和定义、白车身强度分析方法及结果处理方法。本标准适用于CAE部门白车身强度分析。规范性引用文件无。术语和定义本规范涉及到的术语及其定义如下：白车身（BIP）带玻璃的白车身，在本规范中，部分还包括副车架，CCB等对车身起一定加强作用的零件或总成。摘要Abstract本规范概要介绍通过计算机仿真的方法，分析白车身的强度的流程。其目的是确定载荷和边界条件，并根据输入载荷计算应力分布情况，识别出关注部位的风险情况。Thisprocedureoutlinestheanalyticaltechniqueviacomputersimulationforstrengthanalysisofabody-in-whitescheduleinputs.Thepurposeistodescribetheloadingandboundaryconditions,toidentifyareasofconcernandtocalculatethestressesdistributionduetotestinputs.流程图ProcessFlowDiagram准备准备强度分析的输入Gatherinputforstrengthanalysis目标达成？TargetReached?准备强度分析模型Preparatoryworkonmodel准备材料信息Preparatoryworkonmaterial准备载荷信息Preparatoryworkonloading撰写报告Documentandreport进行强度分析Runstrengthanalysis图1流程图Fig1ProcessFlowDiagram工具描述ToolDescription仿真分析过程中需要用到的如下软件:Thefollowingsoftwarefacilitatestheanalyticalsimulationprocess:前处理(Preprocessors):Hypermesh求解器(AnalysisCode):Nastran,Abaqus后处理(Postprocessors):Hyperview建模和分析过程Modeling/AnalysisProcedure建立多体动力学模型，根据设定的工况和整车参数在轮心或轮胎接地点输入载荷，经多体仿真后提取车身和底盘部件连接点的载荷。建立白车身有限元模型，在与底盘连接点处施加载荷，使用惯性释放法，进行有限元线性静强度分析。Wheelcenter(thetirecontactpatches)loadsrequiredasaninputtoamulti-bodydynamicssimulationprogramarecalculatedbyusingvehicleglobalparameterssuchascurbmass,grossvehicleweightrating,axleweightratings,wheelbase,andcgheight.TheanalysesusuallystartwithaninertiarelieftypeofstaticstressanalysisbyaFEsolverpackagefortheloadineachofthesuspensionattachmentpoints.单位Units分析中所用单位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) 牛顿(N)质量(Mass) 吨(Ton)长度(Length) 毫米(mm)时间(Time) 秒(Second)内容Contents分析模型应包含以下部件：白车身，开闭件，座椅，CCB，IP，动力总成，乘员和行李。动力总成，乘员和行李可以用质量单元模拟。检查模型质量，应该和整车簧上质量尽可能保持一致。Themodelshouldcontaincomponentsasbelow:Body-in-white,closures,seats,CCB,IP,PT,passengers,luggage.PT,passengersandluggagecanberepresentedbymasselements.Checkthemodelmassandmakeitequalstothevehiclesprungmassaspossible.坐标系CoordinateSystems除特殊说明，本规范一般使用整车坐标系。（X轴向后，Y轴向右，Z轴向上）Generally,theglobalvehiclesystemisused.Mathdataforthebody-in-whiteisdesignedinthevehiclecoordinatesystem(ie.X-axisrearward,Y-axisrightandZ-axisupward)建模技巧ModelingTechniques白车身的CAD信息应包含以下内容：各部件的钣金件及焊点；各部件的钣金材料属性，粘胶和玻璃的材料属性；各部件的质量及质心位置。CADinformationofthebody-in-whitestructure:Sheetmetalpartsandtheirweldingpoints;Materialpropertiesofsheetmetalcomponents,glueandglass;Massesandtheircenterofgravitypositions;根据车身和其他部件的结构设计，应用不同的单元类型建立有限元模型。如部件是钣金件，用壳单元模拟；如是铸造，则使用实体单元。Thetypeofelementusedtomodelthebody-in-whiteoranyotherstructuredependsonitsdesign.Ifthecomponentisstampedfromsheetmetal,itshouldbemodeledusingshellelements.Ifitisforgedorcast,thensolidelementsshouldbeused.部件的质量，在其质心位置通过RBE2单元连接到白车身。Massesareconnectedtothebody-in-white(oranystructure)throughRBE2elementsattheircenterofgravitypositions,astested.假设和限制Assumptions/Limitations假设Assumptions就应力计算而言：Asfarasstresscalculationsareconcerned:习惯性使用线弹性理论（NASTRANSOL101求解器）；Customaryassumptionsofthelineartheoryofelasticityareused(NASTRANSol101);材料的性能是在室温下测定的。Materialperformanceistestedatroomtemperature.限制Limitations由于考察整个车身（非对称结构）的应力，需要建立整车模型。Asasymmetricstructuresareconsidered,awholemodelisnecessaryinordertoassessstressesthroughoutthestructure.载荷和边界条件Loads/BoundaryConditions边界条件BoundaryConditions分析采用惯性释放方法，不需要进行任何约束。Theanalysisusesinertiareleasemethod,sothereisnonecessarytoconstrainanycomponent.载荷Loads横向载荷Lateralloads0.7g横向右转0.7glateralrightturn0.7g横向左转0.7glateralleftturn垂向载荷Verticalloads1.0g-1.0g垂向（仅做参考）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左轮心外倾转矩（pothole）3.0g–1.0gverticalwith2.0gfore/aftand1.0g-ftcambermomentattheleftwheelcenteronly(pothole).前向/后向载荷Fore/Aftloads0.8g前向制动（不含紧急制动）0.8gforwardbraking(ExcludingPanicBraking).0.5g后向制动（不含紧急制动）0.5greversebraking(ExcludingPanicBraking).最大前向牵引Maximumforwardtractiveeffort.对角扭转载荷Diagonaltwistloads7英寸对角扭转（左前右后轮心向下，右前左后轮心向上）7inchdiagonaltwist(LFandRRWCdown,RFandLRWCu