汽车衣帽钩拉拽分析规范

Q/SZJ191001-2017Q/SZC2-402-2015衣帽钩拉拽分析规范SpecificationOfPullingAnalysisForCoathook20XX20XX-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衣帽钩拉拽分析规范范围本标准规定了衣帽钩拉拽分析的分析方法，以确定整车中衣帽钩强度。本标准适用于CAE部门衣帽钩拉拽分析。规范性引用文件无。术语和定义无。流程图PROCESSFLOWDIAGRAM建模Model建模ModelMeettarget截取车身CutBIW约束边界Boundary设置参数计算Setparameter结束End优化Optimization图1流程图Figure1ProcessFlowDiagram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):Nastran101Abaqus后处理(Postprocessors):HyperView建模和分析过程MODELING/ANALYSISPROCEDURE[综述][英文综述]单位Units分析中所用单位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) N质量(Mass) Ton长度(Length) mm时间(Time) s内容Contents坐标系CoordinateSystems建模技巧ModelingTechniques根据几何用shell单元建立衣帽钩总成和车身Modelthecoathookassemblyandbodywithshellelementstomathdata.假设和限制ASSUMPTIONS/LIMITATIONS以上截取的车身刚度等同整车刚度阻尼对分析无影响Theportionofthevehicledescribedaboverepresentsthevehiclestiffness.Dampingforcesareinsignificanttothisanalysis.假设Assumptions焊接假设WeldAssumptions：材料假设MaterialAssumptions:几何假设GeometryAssumptions:限制Limitations无。约束和边界条件CONSTRAINTS/BOUNDARYCONDITIONS截取车身ABC柱模型，约束边界1-6自由度，然后在车身中线处截取车身，中线约束246自由度，这样可以约束车身的横向移动，如下图所示Beginwithbodymodel.CutbodymodelatA,B,andCpillar.SPC123456atedges.Cutbodyalongcenterlineofthevehicle.ApplySPC'sof246onCenterline.Thisstopsanycrosscarmovement.Seefigurebelow图1边界约束Fig1Boundarycondition如果只做一个衣帽钩分析，可以适当减小模型对于前衣帽钩分析来说，截取到B柱后，然后约束截面1-6自由度对于后衣帽钩分析来说，截取到B柱前，然后约束截面1-6自由度详见下图Dependingifyouaredoingafrontpassengerorrearpassengercoathook,onemaybeabletoreducethemodelevenmore.Forafrontpassengercoathook,onecancutthemodeljustaftoftheb-pillarandapplySPC'sof123456atthisedge.Forarearpassengercoathook,onecancutjustforwardoftheb-pillarandSPC123456.Seefigurebelow.载荷LOADS加载滥用力分析需根据《整车CAE性能目标与方案》要求加载，以满足每个客户的要求，详见下图Applyaverticalabuseloadtothecoathookperthe《整车CAE性能目标与方案》Requirement3.2.1.2.3.3.Thisissubjecttochangepercustomer’srequirements.Seefigurebelow载荷加载在衣帽钩最大开启角度状态，这是极限工况Ifthecoathookhasaloopthatopens,applytheloadintheopenposition.Thiswillgeneratethegreatestmomentonthebody.性能要求PERFORMANCEREQUIREMENTS根据《整车CAE性能目标与方案》要求，当在衣帽钩表面加载150N时，衣帽钩不产生屈服《整车CAE性能目标与方案》Thecoathookshallstayretainedinthebodystructurewithnolossoffunctionwhensubjectedtoseparate150Ncoathookloadsappliedsimultaneouslyonoppositesidesofthestructureinterior分析要求ANALYSISREQUIREMENTS无。结果RESULTS对于垂向滥用力分析，输出衣帽钩、安装支架上的应力和塑性应变用nastran101求解。如果nastran计算的应力结果进入屈服阶段，则需要加载应力应变曲线至abaqus用非线性重新计算，塑性应变〈3%Fortheverticalabuseload,gatherstressesandplasticstrainsoncoathook,mountingbracketry,andbody.UseNASTRANSolution101(LinearStatic)initially.Ifstressesareaboveyield,onewillneedtouseanon-linearanalysiscodesuchasABAQUStorecordplasticstrainlevels.Onemustalsoconsidercontactbetweenthepartstogetatruerepresentationofrealworldconditionswhenrunningnon-linearanalysis.Plasticstrainsbelow2%areacceptable.From2to3%isma