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1、NumericalMethodforCalculatingLoadDistributioninMulti-BoltThickLaminateJointsW?X?Liu,L.Q.Liu*,R.Wei(SchoolofAeronauticsandAstronautics,ShanghaiJiaoTongUniversity,Shanghai,China,200240)plate1；plalc2<6x23456>loadU-direction)五⑶LIntroduceDuetotheextensivelyusesofthemulti-b
2、oltthicklaminatejointsinprimaryloadcomponents,itisveryimporlanllodoresearchonthesubject.Inyears,manyresearchesstudiedtheloadtransferringproblemandtheinfluencesofthegeometricalparameter,thematerialpropertyandthemodelingmethodhaveontheloaddistributionincompositemechanic
3、aljointusingexperimentalandnumericalmethod.Thepreviousworksdidgreatcontributiontothefieldofcompositejointstudy,butfocusedonlyonthethinplatestructure,whichdidnotconsiderthenon-uniiormloaddistributionalongthickness?Henceanewlastandaccuratemethod,whichwillconsiderthethic
4、knesseffects,isneededtoconstructfortheanalysisofthethicklaminatejointsproblem.2.FastenerflexibilityAccordingtothedeformationanalysis,itcanbeconcludedlhalthedeformationoflhefastenerincludesthefollowingparts:theshearandbendingdeformationofthefasteners,plate/,bearingdefo
5、rmationbythefastenersandthefasteners9bearingdeformationbytheplatei.Correspondingly,lheHexibilityofthefastenerincludesthefollowingcomposition:theshearflexibilityC加，thebendingflexibilityC”，thebearingflexibilityoftheplateC切》thebearingflexibilityoflhefastenerC奶Normally,th
6、efastener'silexibililycangetthroughlhecalculation:Cb=Cbs+Cbb+Cb人+CbPi+cbh+c切2(1)Theflexibilityofthefastenercanbedetailedas:r、%4+57也+9&襯+57用+9f；7，~12GA38^/(rt+r2)(2)1111++++旺譏^Ex2t2EcfOtherwise,astheincreaseofthethickness,theloaddistributionthroughthethicknessismoreune
7、qual,andthiswillimpactlhefastener^ilexibililyandtheloadsharingfurther.Therefore,flexibilityofthefastenerneedstobecorrected?Inreferenceofthedatafromthe3Dfiniteelementmodel(Fig」)，thefastener'sflexibilityinsingle-lapboltedthickcompositejointcangetthroughlhecalculationEq(
8、3)?Fig.l3DFEMandcontactbodies5(r,+/2)1+57血+9&工+57//JI2G；AX5a+384E7G,+/2)13131313X—x—x—+X—aCMa臥aEif2t2aWhere(7=(/(+t2)/D,name
