铝合金薄板搅拌摩擦焊接残余变形的数值分析new

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1、4562Vol.45No.220092183—188nACTAMETALLURGICASINICAFeb.2009pp.183–188∗ge#oqBk;w)

2、41)1)1)2)1)1)YTRUSJuergenSilvanusVXW1)`g℄l7T),'1000842)EuropeanAeronauticDefenceandSpaceCompanyInnovationWorks,Munich81663,GermanyG>hWe6056fU)GÆ}9gZ3[b?zv)S,u.)SUÆE5dE,mt)

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wÆ)dz;℄z,vqSUgE:,)SYgCY40z$G20%v.uÆ}9,fU,f4z,)S.y{TG40426m(A2Hi0412−1961(2009)02−0183−06NUMERICALANALYSISONTHERESIDUALDI

4、STORTIONOFAlALLOYSHEETAFTERFRICTIONSTIRWELDINGYANDongyang1),SHIQingyu1),WUAiping1),JuergenSilvanus2),LIUYuan1),ZHANGZenglei1)1)DepartmentofMechanicalEngineering,TsinghuaUniversity,Beijing1000842)EuropeanAeronauticDefenceandSpaceCompanyInnovationWorks,Munich81663,GermanyCorrespond

5、ent:SHIQingyu,professor,Tel:(010)62773859,E-mail:shqy@mail.tsinghua.edu.cnSupportedbyNationalNaturalScienceFoundationofChina(No.50875146)andHighTechnologyResearchandDevelopmentProgramofChina(No.2006AA04Z139)Manuscriptreceived2008–07–30,inrevisedform2008–10–24ABSTRACTAlthoughthere

6、sidualdistortionof6056Alalloysheetafterfrictionstirwelding(FSW)issmallerthanthatafterfusionwelding,itisstillasignificantdefectfortheassemblyandapplicationofweldedstructure.InordertoinvestigateandpredicttheresidualdistortionofAlalloysheetafterFSW,a3Dthermo–mechanicalmodelwasestabli

7、shedbasedonexperimentalconditionstosimulatetheFSWprocess.Inthemodel,heatinputwascomputedbasedonthetorquedatameasuredduringexperiment,andheattransferbetweenweldedsheetandfixtureswassimplifiedinthewayofconvection,andthepropertiesof6056Alalloywereconsideredastemperaturefunction,andtoo

8、lloadsweretakenintoaccountduringthemechanicalanalysis.Thesimulationresultsshowthatthedistributionoflongitudinalresidualstressalongthewidthofsheetisasymmetrical,andtheresidualdistortioncorrespondswellwithexperimentalresultsbothindistortionpatternanddeformationvaluesonthewholesheet

9、.KEYWORDSfrictionstirwelding,Alalloy,num