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1、StudentNotesMaterialsforAeronauticalEngineeringTristanBurgandAlanCroskySchoolofMaterialsScienceandEngineeringUniversityofNewSouthWalesÓ2001NOTICE:Allreferencedimagesinthesenotesarecopiedunderthefollowingact.COMMONWEALTHOFAUSTRALIACopyrightRegulations1969WARNINGThismaterialhasbeenreproducedandcommun
2、icatedtoyoubyoronbehalfoftheUniversityofNewSouthWalespursuanttoPartVBoftheCopyrightAct1968(theAct).ThematerialinthiscommunicationmaybesubjecttocopyrightundertheAct.AnyfurtherreproductionorcommunicationofthismaterialbyyoumaybethesubjectofcopyrightprotectionundertheAct.Donotremovethisnotice.Aerospace
3、Materials–Student2Ó2001MaterialsScienceandEngineering-UNSWINTRODUCTIONThematerialsusedforaircraftconstructioncanbesplitintotwobroadcategories;airframematerialsandenginematerials,andthesewillbeconsideredseparately.However,selectionofmaterialsforbothapplicationsisbasedonthedesignconstraints.Theseared
4、efinedbythemechanical,chemicalandthermalpropertyrequirementsofeachcomponent.Typicaldesignconstraintsincludeweight,stiffness,strength,fatigueperformance(high/lowcycle),corrosionresistanceandcost.THEAIRFRAMETheairframeconsistsofcomponentssuchasthe:wingupper,winglower,fuselage,spars,frames,ribs,landin
5、ggearandcontrolsurfaces.Essentially,theairframeisrequiredtoresistappliedloads,provideanaerodynamicshapeandprotectpassengers,payloadandequipmentfromtheexternalenvironmentalconditions.Eachcomponenthasdifferentspecificconstraints,resultingindifferentmaterialselectionforeachcomponent.WingsOverall,thewi
6、ngsaresubjectedtothemostcomplexandhighestlevelsofstress.However,duetothenatureofthewingloadingtheupperandlowerwingsareloadeddifferently(compressionandtensionrespectively)andthuswillbetreatedseparately.WingupperThewingupperisloadedinbendingandisundercompressionstresses.Thus,toresisttheappliedstresse
7、sandminimiseweightitrequireshighratiosofstiffnesstodensityandyieldstrength(compression)todensity.Theupperwingalsorequiresgoodresistancetostresscorrosioncrackingfracture.WinglowerThewinglowerisloadedinbendin
