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ID:49770734
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页数:10页
时间:2020-03-04
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1、.Vcct(Virtualcrackclosuretechnique)Interlaminarfracturemechanicscharacterizestheonsetofdelaminationsincomposites.Shearloadingcausesthepaneltobuckleandtheresultingout-of-planedeformationsinitiateskin/stringerseparat
2、ionatthelocationofanembeddeddefect.METHOD:FiniteElementAnalysisELEMENT:thepanelandsurroundingloadfixtureweremodeledwithshellelements.Asmallsectionofthestringerfootandthepanelinthevicinityoftheembeddeddefectweremodeledwithalocal3Dsoilmodel.1.BACKGROUNDAerospacesstructuresaremadeoffl
3、atorcuredpanelswithco-curedoradhesivelybondedframesandstiffenerscomputationalstressanalysistodeterminethelocationoffirstmatrixcracking.Anartificialdefectwasplacedattheterminationofthecenterstiffener.Thestiffenedpanelissubjectedtopureshearloadingwhichcausesthepaneltobuckle.ANALYSIS:
4、nolinearfiniteelementanalysisStrainenergyreleaseratesandmixedmaderatioswerecomputedusingthevirtualcrackclosuretechnique.2.METHODOLOGY2.1InterlaminarfracturemechanicsThetotalstrainenergyreleaserateThemodeIcomponentduetointerlaminartensionThemodeIIcomponentduetointerlaminarslidingshe
5、arThemodeIIIcomponentduetointerlaminarscissoringshearWord文档资料.Purpose:topredictdelaminationonsetorgrowthfortwo-dimensionalproblems,thesescalculatedGcomponentsarecomparedtointerlaminarfracturetoughnesspropertiesmeasuredoverarangeofmodemixitiesfrompuremodeIloadingtopuremodeIIloading.
6、Aquasistaticmixed-modefracturecriterionisdeterminedbyplottingtheinterlaminarfracturetoughness,,versusthemixed-moderatio,,determinedfromdatageneratedusingpureModeI()DoubleCantileverBending(DCB)pureModeII()fourpointEndNotchedFlexure(4ENF),andMixedModeBending(MMB)testsofvaryingratiofo
7、rIM7/8852carbonepoxymaterial.andarethefracturetoughnessdataformodeIandIIisafactordeterminedbythecurefit.Showninfigure3inthisarticle.Failureisexpectedwhen,foragivenmixedmoderatioWord文档资料.,thecalculatedtotalenergyreleaserate,,exceedstheinterlaminarfracturetoughness,.1.1.AnalysisTools
8、2.2.1.VirtualCrackClosureT
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