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页数:14页
时间:2019-03-03
《An improved semi-circular bend specimen for investigating mixed mode brittle fracture.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、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
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