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1、ActaMaterialia52(2004)4623–4638www.actamat-journals.comAnisotropicductilefracturePartI:experimentsa,*bbA.A.Benzerga,J.Besson,A.PineauaDepartmentofAerospaceEngineering,TexasA&MUniversity,3141TAMU,H.R.BrightBldg.,CollegeStation,TX77843-3141,USAbEcoledesMinesd
2、eParis,CentredesMateriauxUMRCNRS7633,BP87,F91003,EvryCedex,FranceReceived18December2003;receivedinrevisedform8June2004;accepted11June2004Availableonline20July2004AbstractDeformationandfractureareinvestigatedatroomtemperatureinsteelthroughtensionandcompress
3、iontests.Roundsmoothbarsandcylindersareusedtocharacterizethedeformationbehaviorwhileroundnotchedbarsareusedtoexplorestressstateandspecimenorientationeffectsonfracture.Themicrostructureischaracterizedtoinferinitialaveragevaluesofporosity,voidaspectratioandvoi
4、dspacingratio,allthreeplayingakeyroleinthefractureprocess.Interruptedtestsareusedtodeterminethespatialdistributionofthosevariablesaftercrackextensionthusprovidingabasisforcomparisonatthemicro-scalewiththeoreticalpredictions.Alldamagestagesarefoundtobeinhere
5、ntlyanisotropic,includingvoidnucleationandcrackpropagation.Anim-portantfindingofthisinvestigationisthat,inquantitativemodelingofductilefracture,anyvoidgrowthmodelshouldbesup-plementedbyaphysicallymotivatedvoidcoalescencemodel.Ó2004ActaMaterialiaInc.Published
6、byElsevierLtd.Allrightsreserved.Keywords:Voidnucleation;Coalescencemodes;Imageanalysis;Dirichlettessellation;Porosity1.Introductioncontributionsinonefieldhaveoftenprovedusefultotheother.Inmetalforming,whereprogresshasAnalyzingductilefractureiscentraltoanumbe
7、rofprobablybeenlimitedbythelackofaconciliatoryengineeringproblemswheretoughnessandductilityareframeworkthataccountsforplasticanisotropy[7,8],requiredmechanicalproperties.Existinginfrastructurespredictingductilefractureiskeytounderstandinglargelyemploymetall
8、icalloysasstructuralmaterials.limitingfactorsinformingoperations.Theconstantinterestinductilefractureoverthede-Progressinanalyzingductilefractureisneededin,atcadesstemsfromtheneedtosatisfythespecificati