Analysis of a new specimen for mixed mode fracture tests on brittle materials.pdf

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1、EngineeringFractureMechanics76(2009)1563–1573ContentslistsavailableatScienceDirectEngineeringFractureMechanicsjournalhomepage:www.elsevier.com/locate/engfracmechAnalysisofanewspecimenformixedmodefracturetestsonbrittlematerialsM.R.Ayatollahi*,M.R.M.AlihaFatigueandFractureLab.

2、,DepartmentofMechanicalEngineering,IranUniversityofScienceandTechnology,Narmak,Tehran16846,IranarticleinfoabstractArticlehistory:NumericalandexperimentalstudieswereperformedonanewfracturetestconfigurationReceived12October2008calledthediagonallyloadedsquareplate(DLSP)specimen.

3、ThemodeIandmodeIIstressReceivedinrevisedform11February2009intensityfactorswerecomputedfordifferentcracklengthsandcrackorientationanglesAccepted16February2009usingfiniteelementanalysis.ThenumericalresultsshowthattheDLSPspecimenisableAvailableonline25February2009toprovidepuremo

4、deI,puremodeIIandanymixedmodeloadingconditionsinbetween.FractureexperimentswerealsoconductedonPlexiglasusingtheDLSPspecimen.ItisKeywords:shownthattheresultsobtainedfromthefracturetestsareconsistentverywellwithmixedMixedmodeloadingmodefracturetheories.TestspecimenBrittlefract

5、ureÓ2009ElsevierLtd.Allrightsreserved.Finiteelementanalysis1.IntroductionBrittlefractureisoneofthecommontypesofmechanicalfailureinthecrackedengineeringcomponentsandstructures.ItmayoccurunderpuremodeI,puremodeIIormixedmodeIandIIloading.Mixedmodefractureisusuallystudiedeithert

6、heoreticallyusingdifferentfailurecriteria(e.g.[1–4])orexperimentallyusingappropriatetestmethods.Whileexperimen-talfracturestudiesonrealcomponentsareoftenveryexpensiveanddifficult,researchersprefertoconducttheirexperi-mentsonlaboratoryspecimens.However,thesespecimensshouldbeca

7、refullydesignedsincetheymustbeabletoprovidethesamestatesofstressesandstrainsaroundthecracktipasthoseoftherealcrackedengineeringcomponentsunderserviceconditions.VarioustestspecimenshavebeenusedbyresearchersformixedmodeI/IIfractureexperiments.Therectangularplatecontaininganinc

8、linedcentercrackandsubjectedtoauniformfarfieldtension[5–7],thecentrallycrack