MSC fatigue 实例-组件的疲劳分析

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1、Chapter4:ComponentS-NAnalysisMSCFatigueQuickStartGuide4ComponentS-NAnalysisProblemDescription138Geometry139SetUptheFatigueAnalysis142RuntheFatigueAnalysis158ReviewtheResults159ConcludingRemarks164138MSCFatigueQuickStartGuideProblemDescriptionPr

2、oblemDescriptionAsimplebracketasshownhasadesignlifeof7years(61,320hours).Loadingoccursattheendoftheshortsectionwhichhasbeenweldedandthecomponentisconstrainedatbothendsofthemainbar.Becausefailureisknowntooccurattheweld,thefiniteelementmodelingattheloa

3、dingpointandthestressesfoundtherecanbeignoredforthepurposesofthisexercise.Theloadappliedinthemodelwas900lbstotal.Inservice,thecomponentexperiencesloadingof3000lbsinthedirectionofthefiniteelementloadand7000lbsinthereversedirection.Thisoccursonceevery3

4、0minutes.Onlya4%failurerateisallowed.Objective•TointroducetheconceptofacomponentS-Ncurve.•Tolearnhowtoentermaterialsdataintothedatabasemanager.•Todetermineifthecomponentachievesitsdesignlife.•Todeterminewhatlevelofloadingcanbeachieveandwhatfailurerat

5、ecouldbeexpected-asensitivitystudy.•TounderstandwhatfilesarecreatedbyanMSCFatigueanalysis.Table4-1Chapter4NecessaryFilesFileP3_HOME/mscfatigue_files/examples/bracket.op2Chapter4:ComponentS-NAnalysis139GeometryGeometryInvokeMSCPatranasyoudidintheprevi

6、ousexamples.Thegeometrycanbefoundinthefilebracket.op2.TheresultsarefromMSCNastran.Copythefiletoyourworkingdirectory.Openanewdatabaseinaclean,emptyworkdirectoryfromtheFile

7、Newmenu.Givethenamebrackettothedatabase.ImporttheModelandResultsPresstheAnalysi

8、stoggleswitchortabonthemainform.WhentheformappearssettheActiontoAccessResults,theObjecttoReadOutput2,andtheMethodtoBoth(modelandresults)thenpresstheSelectResultsFilebuttonandselectthefilebracket.op2andclickApply.Themodelwillthenappearandyouarereadyto

9、setupafatigueanalysis.ViewtheStressResultsBeforemovingontothefatigueanalysis,presstheResultsapplicationswitchortabonthemainformtoviewthestressresultsfromtheMSCNastrananalysis.SelectStressTensor,fromthelistboxandsetthe140MSCFatigueQuickStartGuideGeome