msc-fatigue-实例-组件的疲劳分析

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1、Chapter4:ComponentS-NAnalysisMSCFatigueQuickStartGuide4ComponentS-NAnalysisggggggProblemDescription138Geometry139SetUptheFatigueAnalysis142RuntheFatigueAnalysis158ReviewtheResults159ConcludingRemarks164 138MSCFatigueQuickStartGuideProblemDescriptionProblemDescriptionAs

2、implebracketasshownhasadesignlifeof7years(61,320hours).Loadingoccursattheendoftheshortsectionwhichhasbeenweldedandthecomponentisconstrainedatbothendsofthemainbar.Becausefailureisknowntooccurattheweld,thefiniteelementmodelingattheloadingpointandthestressesfoundtherecanb

3、eignoredforthepurposesofthisexercise.Theloadappliedinthemodelwas900lbstotal.Inservice,thecomponentexperiencesloadingof3000lbsinthedirectionofthefiniteelementloadand7000lbsinthereversedirection.Thisoccursonceevery30minutes.Onlya4%failurerateisallowed.Objective•Tointrodu

4、cetheconceptofacomponentS-Ncurve.•Tolearnhowtoentermaterialsdataintothedatabasemanager.•Todetermineifthecomponentachievesitsdesignlife.•Todeterminewhatlevelofloadingcanbeachieveandwhatfailureratecouldbeexpected-asensitivitystudy.•TounderstandwhatfilesarecreatedbyanMSCF

5、atigueanalysis.Table4-1Chapter4NecessaryFilesFileP3_HOME/mscfatigue_files/examples/bracket.op2 Chapter4:ComponentS-NAnalysis139GeometryGeometryInvokeMSCPatranasyoudidinthepreviousexamples.Thegeometrycanbefoundinthefilebracket.op2.TheresultsarefromMSCNastran.Copythefile

6、toyourworkingdirectory.Openanewdatabaseinaclean,emptyworkdirectoryfromtheFile

7、Newmenu.Givethenamebrackettothedatabase.ImporttheModelandResultsPresstheAnalysistoggleswitchortabonthemainform.WhentheformappearssettheActiontoAccessResults,theObjecttoReadOutput2,andtheMetho

8、dtoBoth(modelandresults)thenpresstheSelectResultsFilebuttonandselectthefilebracket.op2andclickApply.Themodelwillthenappearandyouarereadytosetupafatigueanalysis.ViewtheStressResultsBeforemovingontothefatigueanalysis,presstheResultsapplicationswitchortabonthemainformtovi

9、ewthestressresultsfromtheMSCNastrananalysis.SelectStressTensor,fromthelistboxandsetthe 140MSCFatigueQuickStartGuideGe