三維編織復合材料幾何建模及界面損傷力學研究.pdf

1、山東輕工業(yè)學院碩士學位論文三維編織復合材料幾何建模及界面損傷力學研究姓名：孫曉強申請學位級別：碩士專業(yè)：機械電子工程指導教師：魏高峰20110601山東輕工業(yè)學院碩士學位論文IABSTRACT3Dbraidedcompositesiswidelyusedinaerospacedefensemedicalcivilianfacilitiesotherhightechareasbyitsexcellentperfmanceoutstingd

2、esignability.Theresearchof3Dbraidedcompositesmechanicalpropertydamageisaveryimptantproblem.Atpresentthoughtheresearchofmechanicsbehaviof3Dbraidedcompositeshassomeprogresstherearemanyproblemsneedtobefurtherinvestigated.Th

3、ispaperstudies3Dbraidedcompositesbypredictingelasticconstantsanalysingstressdamageoffiberfibermatrixinterfaceusingtheynumericalanalysis.Inthefirstchapterthedevelopmentof3Dbraidedcompositesisintroducedtherecentresearchpro

4、gressof3Dbraidedcompositesongeometrymodelingprocessnumericalsimulationofmechanicalpropertyanalysisofinterfacialmechanicsarereviewedthewriterexpoundsthepurposeofthistopicsignificanceofresearch.Inthesecondchaptereffectivem

5、odulusofthe3Dbraidedcompositesispredictedbyusinginternalcellcurvedfibermodelsurfacecellanglecellpolylineflbermodel.Firstaccdingtothegeometricdistributionoffiberinmodelperiodicthreecellmodelsisestablishedfibermatrixvolume

6、percentageofeachmodelisseparatelycalculated.Thenthestiffnessmatrixofeachsinglecellmodelisgetthroughaveragingstiffness.Finallytheeffectiveelasticmodulusof3Dbraidedcompositesprefmareobtainedbythemethodofaveragingvolume.Int

7、hethirdchapterthewriterresearchesasinglestraightfiberanalysesstressofinterface.Firstcurvedfibrecanbeexpressedasacombinationofaseriesofinfinitesimalstraightfiberthroughcodinatetransfmationfiberaxialstresstheshearstressare

8、getbythetheeticalanalysisoffiberdrawingmodel.Thenthestressnephogramdataoffibermatrixareobtainedthroughsimulatingfiberdrawingmodelusingthefiniteelementsoftware.Finallythenumericalresultsareanalysed.Inthefourthchapterthewr

9、iterdiscussesthestressdistributionofdefectivebraidedcomposites.Firstthroughusingtheeigenvaluemethodofaxisymmetricinterfacesingularstressfieldinterfacemechanicsfracturemechanicstheythestressdistributionfracturecriterionof