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复合材料板孔边应力场的有限元分析.docx

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复合材料板孔边应力场的有限元分析 1.Introduction Compositematerialshavegainedconsiderableattentioninthefieldofmaterialengineeringduetotheirexceptionalmechanicalproperties,suchashighstrength,stiffness,andtoughness.Thesematerialsarewidelyusedinvariousapplications,includingaerospace,automotive,marine,andcivilengineering.Compositestructuresaretypicallyfabricatedbybondingorstackingmultiplelayersofdifferentmaterials,referredtoasplies,toformalaminate.Themechanicalbehaviorandresponseofcompositestructuresarecriticallydependentonthenatureoftheinterfacesbetweenplies. Oneofthechallengesfacingthedevelopmentofcompositestructuresisthepresenceofdrillingholesinthestructures.Drillingholesincompositestructuresmaycompromisetheirstructuralintegrityduetostressconcentrationanddamageaccumulationaroundtheholeedges.Therefore,understandingthestressfieldattheedgesofthedrilledholeiscriticallyimportantfordesigningandanalyzingcompositestructures. Inthispaper,wewilldiscussthefiniteelementanalysisofthestressfieldattheedgesofthedrilledholeincompositematerials. 2.StressAnalysisinCompositeStructures Finiteelementanalysisisawidelyusedtoolforanalyzingthestressanddeformationbehaviorofcompositestructures.Afiniteelementmodelinvolvesdiscretizingacontinuousstructureintosmaller,simplerelementsthatareeasiertoanalyze.Thestructuralbehaviorofeachelementisthencalculatedandusedtopredicttheoverallbehavioroftheentirestructure. Oneofthechallengesinfiniteelementanalysisofcompositestructuresistheanisotropicnatureofthesematerials.Compositematerialsoftencomprisemultiplelayersofanisotropicplies,makingtheiranalysismorecomplexthanhomogeneousmaterials.Themechanicalpropertiesofcompositematerials,suchasstiffness,strength,andthermalconductivity,varydependingontheorientationoftheplies.Therefore,toaccuratelyanalyzethestressbehaviorofcompositestructures,itisimportanttoconsidertheanisotropicnatureofthesematerialsinthefiniteelementmodel. 3.StressAnalysisofDrilledHolesinCompositeStructures Drillingaholeinacompositestructureoftenresultsintheaccumulatio