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1、JOURNALOFTHEMECHANICALBEHAVIOROFBIOMEDICALMATERIALS2(2009)217±223availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/jmbbmResearchpaperAfiber-ceramicmatrixcompositematerialmodelforosteonalcorticalbonefracturemicromechanics:Solutionofarbitrarymic
2、rocracksinteractionAhmadRaeisiNajafia,AhmadRezaArshia,,KavehPourAkbarSaffara,MohamadRezaEslamib,ShahriarFariborzb,ManssourH.MoeinzadehcaDepartmentofBiomedicalEngineering,AmirkabirUniversityofTechnology,Tehran,IranbDepartmentofMechanicalEngineering,AmirkabirUnivers
3、ityofTechnology,Tehran,IrancDepartmentofIndustrialandEnterpriseSystemsEngineering,UniversityofIllinoisatUrbana–Champaign,USAARTICLEINFOABSTRACTArticlehistory:Microcracksformedinboneareduetofatigueandcyclicloading.ThisformationisReceived1March2008associatedwithared
4、uctionofboneresistancetofracture.However,thesignificanceoftheReceivedinrevisedformparametersthatgovernmicrocrackbehaviorisnotyetfullyexplored.Atwo•dimensional12June2008micromechanicalfiber•ceramicmatrixcompositematerialmodeloftheosteonalcorticalAccepted13June2008bon
5、eispresentedinthispaper.ThesolutionfortheedgedislocationsasGreen’sfunction,Publishedonline26June2008isadoptedtoformulateasystemofsingularintegralequationsforthegeneralmicrocracksinvicinityoftheosteon.Theeffectsofmicrostructuralmorphologyandheterogeneityoftheboneup
6、onthefracturebehaviorisinvestigatedbycomputingtheStressIntensityFactor(SIF)nearthemicrocrackstips.Analysisofmicrocracksinteractionindicatesthesignificanceofmicrocracksconfigurationintheshapeofeitherstressamplificationorstressshielding.c2008ElsevierLtd.Allrightsreserv
7、ed.1.Introductionbysuchpeopleasathletesandsoldiers;thisresultsin“StressFracture”(TaylorandKuiper,2001).TheweaknessLoadingofquasi•brittlematerialsresultsinformationofencounteredinthebonerepairmechanismduringtheagingmicrocracks.Thisisfollowedbythegrowthofmainprocess
8、isalsoaccompaniedbymicrocrackaccumulationcracksthroughmicrocrackaccumulation(Vashishthetal.,whichresultsin“FragilityFracture”(Schaffleretal.,1995).1997).
