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1、Chapter3Materialmodelandmaterialcharacterizationofautomotivealuminiumalloy5052H343.1prefaceThebasicpropertyofmaterialdecidestheusefunctionofthestructure.intheresearchofcarcrashesandlargedeformationofkeycomponents,thekeypointofsolvingtheproblemistobuildcorrespondingphysic
2、s-mathmodelinordertoacquirethespecificmaterialparameters.Asfortheautomotivealuminiumalloyinourresearch,weneedtoconsidertheresponsecharacteristicofthematerialmachanismonconditionofrealimpact(suchasdynamicloading,high-stresscondition,includingprimarydefectsordamage,etc).By
3、thisway,numerousperformancetestandfull-sizecomponnetcrashtestneedtobeconducted,whichwouldexhaustgreatlaborpowerandphysicalresources,buttheresultisstilldubious.Withthelimiteddiscretdataobtainbytheexperimentjtcanhardlycoverthespaceofallsolutionofthemodel.Forsomeextremecond
4、itionsuchasshearingstresscondtion,highstrainrate(e1^2X102),ithardtopredictitsmachanismresponse.Therefore,thismodelwebuilthasitscomparativelylargelimitations.Butcombinewithnumericalsimulations,itcanexpandthespaceofthemodeleffectively,whileobtaincompletematerialparameters.
5、Theresultshowsthattheprecisionofnumericalsimulationislargelydependontheprecisionofmaterialparametertoinput.Intheanalysisoflargedeformation,mater-ialmachanismmustdescribethematerialchangefromelasticdeformation,elastoplasticdeformation,damageprogession.evolvement,fracture,
6、whichismulti-stepmachanismprocedure.Besides,variousstrainrate,anisotropiccausedbyprocessinghistory,etcneedtobetakeintoaccounttoconsideritsaffectionwithconstitutiverelations.Previously,thisisaextremelycomplexproject,wheremanyproblemsisstillunsolved.J.G.BIauelandD.Z.Su,etc
7、simplyusedtensilebarexperimentcombinedwithfiniteelementtosimulatethecharacterizationofAW6016automotivealuminiumalloyandcrashtestofthetypicalcomponentsinautomobiles.ltpredictsthestaticanddynamicresponseofthealuminiumalloyandkeycomponentsinmacroperspective,andexpandG・T-Nmo
8、delinmicroperspective.whichexplaintheductilefractureofthealuminiumanditsinitiationandevlovementbymachan
