An improved semi-circular bend specimen for investigating mixed mode brittle fracture.pdf

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1、EngineeringFractureMechanics78(2011)110–123ContentslistsavailableatScienceDirectEngineeringFractureMechanicsjournalhomepage:www.elsevier.com/locate/engfracmechAnimprovedsemi-circularbendspecimenforinvestigatingmixedmodebrittlefractureM.R.Ayatollahi⇑,M.R.M.A

2、liha,H.SaghafiFatigueandFractureLab.,CenterofExcellenceinExperimentalSolidMechanicsandDynamics,SchoolofMechanicalEngineering,IranUniversityofScienceandTechnology,Narmak,Tehran16846,IranarticleinfoabstractArticlehistory:Anedgecrackedsemi-circularspecimensubje

3、ctedtoasymmetricthree-pointbendloadingReceived29December2009wassuggestedforinvestigatingmixedmodefractureinbrittlematerials.Usingfiniteele-Receivedinrevisedform20July2010mentanalysis,thecrackparameterswereobtainedforvariouscracklengthsanddifferentAccepted11O

4、ctober2010locationsofloadingpoints.ItwasshownthatbyselectingappropriatepositionsfortheAvailableonline16October2010loadingpoints,fullmodemixitiesfrompuremodeItopuremodeIIcouldbeachieved.Then,aseriesoffracturetestswereconductedonPMMAusingtheproposedspecimen.K

5、eywords:VerygoodagreementwasfoundbetweentheexperimentalresultsandthosepredictedMixedmodeloadingfromthegeneralizedmaximumtangentialstresscriterion.FiniteelementanalysisBrittlefractureÓ2010ElsevierLtd.Allrightsreserved.FractureexperimentsPMMA1.IntroductionThe

6、presenceofflawsandcracksareveryofteninevitableinengineeringstructuresandcomponents.Thecrackscanbegeneratedduringthemanufacturingprocessesorduetocyclicloadingorenvironmentalcauses,etc.PuremodeIandpuremodeIIaretwomodesofdeformationthattakeplaceforacrackedcompo

7、nentsubjectedtoin-planeloading.Inpracticalsituations,thecrackedstructuressometimesexperiencemixedmodeloading,i.e.acombinationofmodeIandII.Mixedmodebrittlefractureisoneofthecommontypesofmechanicalfailureincrackedcomponentsmadeofbrittleorquasi-brittlematerial

8、s.Therefore,itisimportanttoinvestigatethestructuralintegrityofcrackedcomponentsundermixedmodeloading.Severaltheoreticalandexperimentalmethodshavebeensuggestedbyresearchersforexploringmixedmodebrittlefr