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1、ComputationalMaterialsScience46(2009)180–185ContentslistsavailableatScienceDirectComputationalMaterialsSciencejournalhomepage:www.elsevier.com/locate/commatsciNumericalanalysisofanimprovedDCDCspecimenforinvestigatingmixedmodefractureinceramicmaterialsM.R.Ayatollahi*,S.Bag
2、herifardFatigueandFractureLaboratory,DepartmentofMechanicalEngineering,IranUniversityofScienceandTechnology,Narmak,16846Tehran,IranarticleinfoabstractArticlehistory:Doublecleavagedrilledcompression(DCDC)specimen,onaccountofitsspecificfractureparametersandReceived18January2
3、009alsostrongcrackpathstability,isfrequentlyusedincrackgrowthstudiesofbrittlematerialssuchasReceivedinrevisedform18February2009ceramicsandglasses.VariousconfigurationsofthisspecimenhavebeendevelopedandstudiedintheAccepted22February2009pastinordertodeterminefractureparamete
4、rsindifferentloadingconditions.Availableonline28March2009Inthispaper,animprovedDCDCspecimenisproposedbymeansofsomegeometricalmodificationsappliedtothestandardDCDCconfiguration.FiniteelementanalysesindicatethatcontrarytoallpreviousPACS:DCDCconfigurations,thenewversionhasthedi
5、stinctpotentialtoprovidetheentirespanofpractical46.50.+aloadingconditionfrompuremodeItopuremodeII.ItisalsoshownthattheT-stresstermisstrongly62.20.M62.20.mmnegativeinthisspecimen.Usingageneralizedmaximumtangentialstress(MTS)criterion,theT-stress62.20.mteffectsonfracturein
6、itiationoftheproposedspecimenareinvestigatedanalytically.Ó2009ElsevierB.V.Allrightsreserved.Keywords:BrittlefractureCeramicmaterialsFractureanalysisMixedmodeloadingFiniteelementanalysis1.IntroductionI/IIfractureinitiation,differenttypesofspecimenshavebeendeveloped;seefore
7、xample[1–6].Applicationsforadvancedceramicshavereceivedmajoratten-Thedoublecleavagedrilledcompression(DCDC)specimenistioninrecentyears,particularlyforsuchhighperformancecondi-oneofthefavoriteconfigurationsusedforthedeterminationoftionswhereacombinationofpropertiessuchaswea
8、rresistance,crackgrowthconditions.Thisspecimenwasinitiallydevelopedhardness,stiffnessandcorrosio