Anisotropic ductile fracture Part I experiments.pdf

《Anisotropic ductile fracture Part I experiments.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

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