Q/SZJ191001-2017腳踏板（車身側(cè)）位置強(qiáng)度、疲勞耐久分析規(guī)范SpecificationOfDurabilityAnalysisForAssistStepComponentBIW20XX20XX-XX-XX實(shí)施20XX-XX-XX發(fā)布XXXX汽車工程技術(shù)有限公司發(fā)布腳踏板車身側(cè)位置強(qiáng)度、疲勞耐久分析規(guī)范范圍本標(biāo)準(zhǔn)規(guī)定了腳踏板車身側(cè)位置強(qiáng)度分析、疲勞耐久分析的分析方法，以確定腳踏板車身側(cè)位置剛強(qiáng)度疲勞耐久。本標(biāo)準(zhǔn)適用于CAE部門腳踏板車身側(cè)位置強(qiáng)度、疲勞耐久分析。規(guī)范性引用文件無。術(shù)語和定義無。流程圖PROCESSFLOWDIAGRAM建模Model建模ModelMeettarget加載Applyload約束邊界Boundary設(shè)置參數(shù)計(jì)算Setparameter結(jié)束End優(yōu)化Optimization圖1流程圖工具描述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):ncodedyna后處理(Postprocessors):HyperView建模和分析過程MODELING/ANALYSISPROCEDURE單位Units分析中所用單位制如下所示:Theunitsusedintheanalysisareasfollows:力(Force) N質(zhì)量(Mass) Ton長度(Length) mm時(shí)間(Time) s內(nèi)容Contents腳踏板及其支架Assiststepandbrackets坐標(biāo)系CoordinateSystems建模技巧ModelingTechniques腳踏板總成建模盡可能使用殼單元所涉及到有RBE2的螺栓安裝孔必須加washer支架安裝到車身上當(dāng)用Nastran計(jì)算時(shí)，腳踏板安裝支架和車身的接觸位置用Y向的RBE2模擬連接Modeltheassiststepsystemusingshellelements.WashersshallbesimulatedbyconnectingtheRBE2’stotheinsideandoutsideoftheelementsaroundtheboltholesBracketsareattachedtobody假設(shè)和限制ASSUMPTIONS/LIMITATIONS無。約束和邊界條件CONSTRAINTS/BOUNDARYCONDITIONS如圖切BIW，然后邊界約束SPC1-6CutBIWandSPC’s1-6atedges圖2邊界約束載荷LOADS在有可能被腳踏的位置加載1334N的壓力門開啟時(shí)，在腳踏板上同時(shí)加載1111N的壓力壓力加載面積：寬75mmX長100mmStrengthanalysis:assiststepsystemshallbeloadedwithasingle300lbpressureloadatvariouspointsincludingtheextremeforeandaftoftheuseablestepsurface.Assiststepsystemshallbeloadedwithtwosimultaneous250lbpressureloadslocatedinthecenterofthedooropenings.Thepressureloadareashallbe75mmwideby100mmlongDurabilityanalysis:analysisresultsshouldbeusedtorundurabilityfatigueloadcyclingusingaprogramsuchasncode.Typicalcyclesare40000forsingleand10000formultipleoccupantloads.CheckSSTSforindividualprogramrequirements.當(dāng)用ncode計(jì)算疲勞耐久時(shí)，需要nastran的計(jì)算結(jié)果作為輸入條件，典型的單點(diǎn)40000次，多點(diǎn)10000次載荷。檢查各個(gè)子系統(tǒng)的性能。性能要求PERFORMANCEREQUIREMENTS腳踏板每個(gè)加載點(diǎn)垂向位移均小于7.5mmNastran：小于屈服應(yīng)力Dyna:不能產(chǎn)生永久變形Ncode:記錄部件壽命Assiststepsystemverticaldeflectionlessthan7.5mmundereachloadNastran:stress〈yieldstressDyna:permanentsetNcode:thefatiguelifeofthecomponent.分析要求ANALYSISREQUIREMENTS無。結(jié)果RESULTS結(jié)果格式ResultsForm