Introduction to Aircraft Structural Analysis (Elsevier Aerospace Engineering)

Problems 585

wouldbethevalueoftheshearflowinthepanelwithoutcutouts.Consideringahorizontallengthof
thepanelthroughthecutouts,weseethat

q 1 l 1 =qavl

or

q 1 =

l

l 1

qav (21.3)

Nowconsideringaverticallengthofthepanelthroughthecutouts,

q 2 d 1 =qavd

or

q 2 =

d

d 1

qav (21.4)

Theshearflowsq 3 maybeobtainedbyconsideringeitherverticalorhorizontalsectionsnotcontaining
thecutout.Thus,

q 3 ll+q 2 lw=qavl

Substitutingforq 2 fromEq.(21.3)andnotingthatl=l 1 +lwandd=d 1 +dw,weobtain

q 3 =

(

1 −

dw

dl

lw

ll

)

qav (21.5)

Problems..............................................................................................

P.21.1 ThedoublysymmetricalfuselagesectionshowninFig.P.21.1hasbeenidealizedintoanarrangementof
directstress-carryingboomsandshearstress-carryingskinpanels;theboomareasareall150mm^2 .Calculatethe

Fig. P.21.1