叶轮焊接残余应力及变形量的有限元计算分析

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1、大连理工大学硕士学位论文叶轮焊接残余应力及变形量的有限元计算分析姓名：王睿申请学位级别：硕士专业：机械制造及其自动化指导教师：李宏坤20071201叶轮焊接残余应力及变形量的有限元计算分析CalculationandAnalysisofResidualStressandDeformationofWeldingonImpellersbyUsingFiniteElementMethodAbstractWeldingisaindispensabilityWoccsstechnologyinmodernindustrymanufacturete

2、chnology．Becausetheweldingmanufacturetechnologyhasthecharacteristicthatseveralsubjectsynthesize．weldingtechnologycanamalgamationinthenewestscienceandtechnologyqmcHy．Weldingisoneoftheimportanttechnologiesinimpellers’artifactitious．Duringtheprocessofweldingonimpellers，temp

3、eratureisveryhigh．ItCallreach1500"C．Inthisllightemperaturecondition．impellerspresentmaterialnonlinearandgeometricalnonlinear．Thisleadtothedisplacementoftheimpellersoverstepthetolerancerequireafterweldinganddissymmetriealflowpassagespacingbetweentheblades．Itaffectsthepneu

4、maticperformance．Moreoverresidualstresscanbringhiddentroublewhentheimpellersinhigllspeedcireumrotation．TheresultsofresidualstressanddistortionarebetterforthedesignerstOimproveweldingscheme．ItsaimisreduceCOStandassⅢeflowpassageshape．ThispaperisbasedoncooperationitemwitllS

5、henyangTurbo-MachineryCorporation．Accordingtotheproject,thispaperfoundawholeimpellermodel．Combined谢tllbirth&deathelementmethodandAPDLparameterlanguagemakeprogramming，thefmiteelementmethodisappliedtoweld’Ssimulate．Themainpointsarelistedasbelow．Thepapersimulatesthewholepro

6、cessofimpeller’Swelding．Theprocessisincludewarm-up(180。C)，tungsteninertgas(TIO)，overlayingwelding，heattreatmentandcoolinginair．Calculatetheimpeller’Stemperaturefield．stressfieldanddisplacementfielddistributing．Theresultshowtheimpeller’SdiStortionandresidualstress．Forthed

7、iscontinuousweldingease，thepaperfoundapredigestimpellermodel．Calculatethefields’distributingofthecontinuousweldingandthediscontinuousweldingaleightdifferenttimes．Contrasttheresultsofthedifferentcase，thedisCOntinuouswelding’sstl陀SSzoneandthree-directiontensileSll'eSSCOndi

8、tionzonearebiggerthantheCOntinuouswelding’S．Thesearedisadvantagetothel瑚andthefatiguelifeofimpeller．Fort