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ID:34931875
大小:1.28 MB
页数:50页
时间:2019-03-14
《8. Adhesive Bonding and Integrally Cocured Structure.pdf》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、Chapter8AdhesiveBondingandIntegrallyCocuredStructureManufacturingTechnologyforAerospaceStructuralMaterialsAdhesivebondingisamethodofjoiningstructuretogetherthateliminatessome,orall,ofthecostandweightofmechanicalfasteners.Inadhesivebonding,curedcompositesormeta
2、lsareadhesivelybondedtoothercuredcomposites,honeycombcore,foamcore,ormetallicpieces.Cocuringisaprocessinwhichuncuredcompositepliesarecuredandbondedsimultaneouslyduringthesamecurecycletoeithercorematerialsorothercompositeparts.Theabilitytomakelargebondedandcocu
3、redunitizedstructurecaneliminateasignificantportionoftheassemblycosts.Adhesivebondingisawidelyusedindustrialjoiningprocessinwhichapoly-mericmaterial(theadhesive)isusedtojointwoseparatepieces(theadherendsorsubstrates).Therearemanytypesofadhesives;somearestronga
4、ndrigidwhileothersareweakandflexible.Adhesivesusedforstructuralbondingarealwayscuredateitherroomorelevatedtemperaturesandmustpossessadequatestrengthtotransfertheloadsthroughthejoint.Therearemanytypesofstruc-turaladhesives;however,epoxies,nitrilephenolics,andbi
5、smaleimidesarethemostprevalent.Inadditiontofabricatinglargebondedcomponents,adhesivebondingisfrequentlyusedforrepairingdamagedstructuralparts.Bondedjointsmaybepreferredifthincompositesectionsaretobejoinedwherebearingstressesinboltedjointswouldbeunacceptablyhig
6、h,orwhentheweightpenaltyformechanicalfastenersistoohigh.Ingeneral,thinstructureswithwell-definedloadpathsaregoodcandidatesforadhesivebonding,whilethickerstructureswithcomplexloadpathsarebettercandidatesformechanicalfastening.18.1AdvantagesofAdhesiveBondingThea
7、dvantagesofadhesivebondinginclude:2•Bondingprovidesamoreuniformstressdistributionthanmechanicalfas-tenersbyeliminatingtheindividualstressconcentrationpeakscausedbymechanicalfasteners.AsshowninFig.8.1,thestressdistributionacrossthejointismuchmoreuniformforthead
8、hesivebondedjointthanforthemechanicaljoint,leadingtobetterfatiguelifethanthatformechanicallyfastenedjoint.Bondedjointsalsoprovidesuperiorvibrationanddampingcapability.•Duetotheelim
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