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1、Chapter7AdvancedCompositeMaterialsDescriptionofCompositeStructuresIntroductionCompositematerialsarebecomingmoreimportantintheconstructionofaerospacestructures.Aircraftpartsmadefromcompositematerials,suchasfairings,spoilers,andflightcontrols,weredevelopedduringthe1960sfortheirweightsav
2、ingsoveraluminumparts.Newgenerationlargeaircraftaredesignedwithallcompositefuselageandwingstructures,andtherepairoftheseadvancedcompositematerialsrequiresanin-depthknowledgeofcompositestructures,materials,andtooling.Theprimaryadvantagesofcompositematerialsaretheirhighstrength,relative
3、lylowweight,andcorrosionresistance.7-1LaminatedStructuresAmatrixsupportsthefibersandbondsthemtogetherintheCompositematerialsconsistofacombinationofmaterialscompositematerial.Thematrixtransfersanyappliedloadsthataremixedtogethertoachievespecificstructuraltothefibers,keepsthefibersinthe
4、irpositionandchosenproperties.Theindividualmaterialsdonotdissolveormergeorientation,givesthecompositeenvironmentalresistance,andcompletelyinthecomposite,buttheyacttogetherasone.determinesthemaximumservicetemperatureofacomposite.Normally,thecomponentscanbephysicallyidentifiedastheyinte
5、rfacewithoneanother.ThepropertiesofthecompositeStrengthCharacteristicsmaterialaresuperiortothepropertiesoftheindividualStructuralproperties,suchasstiffness,dimensionalstability,materialsfromwhichitisconstructed.andstrengthofacompositelaminate,dependonthestackingsequenceoftheplies.Thes
6、tackingsequencedescribesAnadvancedcompositematerialismadeofafibrousmaterialthedistributionofplyorientationsthroughthelaminateembeddedinaresinmatrix,generallylaminatedwithfibersthickness.Asthenumberofplieswithchosenorientationsorientedinalternatingdirectionstogivethematerialstrengthinc
7、reases,morestackingsequencesarepossible.Forandstiffness.Fibrousmaterialsarenotnew;woodisthemostexample,asymmetriceight-plylaminatewithfourdifferentcommonfibrousstructuralmaterialknowntoman.plyorientationshas24differentstackingsequences.Applicationsofcompositesonaircraftinclude:FiberOr
8、ienta
