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1、InternationalJournalofPlasticity15(1999)963±980AcriticalreviewofexperimentalresultsandconstitutivemodelsforBCCandFCCmetalsoverawiderangeofstrainratesandtemperaturesRiqiangLiang,AkhtarS.Khan*DepartmentofMechanicalEngineering,UniversityofMaryland,BaltimoreCo
2、unty,MD21250,USAReceivedinfinalrevisedform26February1999AbstractFourcurrentlyutilizedconstitutivemodelsformetals(i.e.Johnson±Cook,Zerilli±Armstrong,Bodner±PartomandKhan±Huang)areinvestigatedandusedtopredictthemechanicalbehaviorsofthematerialsandcomparedwit
3、hexperimentalresults.Limitationsforeachmodelindescribingwork-hardeningbehaviorofmetalsarediscussed.#1999ElsevierScienceLtd.Allrightsreserved.Keywords:Constitutivemodels;Highstrainrate;Impactloading;C.Kolskybar1.IntroductionItisnowwellknownthatthemechanical
4、behaviors,suchasyieldstress,ductility,andstrength,etc.,ofmaterialswillchangeunderdierentstrain-rateloadingsandtemperatures.Theconsiderationofrateandtemperaturedependenceofmaterialbehaviorisveryimportantinthedesignofstructures.Anunderstandingofdefor-mationb
5、ehaviorofmetalsoverawiderangeoftemperaturesandstrainratesisofimportanceinmetalforming,high-speedmachining,high-velocityimpact,penetra-tionmechanics,explosive-metalinteraction,andothersimilardynamicconditions.Flowstressmeasuresthestrengthandistheresistancet
6、oplastic¯owofthematerialatanyinstantunderanystrainrate.Theratesensitivity,de®nedastheamountofchangeof¯owstressbecauseofachangeofstrainrate,isthemajorresistancetoinstability.Therefore,theaccuratedeterminationanddescriptionofthe*Correspondingauthor.0749-6419
7、/99/$-seefrontmatter#1999ElsevierScienceLtd.Allrightsreserved.PII:S0749-6419(99)00021-2964R.Liang,A.S.Khan/InternationalJournalofPlasticity15(1999)963±980ratedependenceofmechanicalbehaviorofmaterials,alongwiththetemperaturedependenceandworkhardeningofthose
8、materialshaveattractedconsiderableattentionfrommaterialandmechanicsscientistsformorethan®vedecades.SincethepioneeringworksofvonKarman(1950)andTaylor(1942),greatprogresshasbeenmadebothexperimentallyandanalytic
