Aircraft Structures- zul (2).doc

8/14/2019 Aircraft Structures- zul (2).doc

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LEADING EDGE – STABILIZER

Tension-when air flow over the horizontal stabilizer, tensile fore atin! "#on the str"t"re an$

the str"t"re ten$ to #"ll the stabilizer to fall a#art% Therefore &aterial nee$e$ for stabilizer &"st

be stron! eno"!h to withstan$ the fore%

Ben$in!-A ben$in! fore tries to #"ll one si$e of a bo$' a#art while at the sa&e ti&e s("eezin!

the other si$e to!ether res"ltant fro& air flow over the stabilizer at hi!h s#ee$



TRAILING EDGE- STABILIZER

Torsion-As a res"lt fro& trailin! e$!e $ra!, this twistin! fore atin! "#on the s"rfae an har&

an$ ra)e$ the str"t"re%a tensile stress ats $io!anall' aross the s"rfae an$ a o&#ressive

stress ats at ri!ht an!les to the torsion%



A*+ILLAR SAR

Shear-At the &o"ntin! s"rfae of the stabilizer, shear stress o"r bea"se the stabilizer fla##in!

an$ it ten$ to #"ll o"t the the &o"ntin! s"rfae fall a#art% This stress &ostl' ats "#on the rivet

on the .oint s"rfae of the stabilizer

Torsion-Torsion o"r at this str"t"re res"ltant fro& stabilizer fla##in! an$ #ro$"e twistin!

fore at the s"rfae

Ben$in!-This str"t"re &"st be able to withstan$ both o&#ressive an$ tensile stresses bea"se

the air at hi!h s#ee$ ten$ to &a)e the stabilizer fla##in!% As a res"lt, the ben$in! stresses atin!

"#on the s"rfae an$ it an $a&a!e the str"t"re%

/R0NT SAR



The shear stress bein! a##ro1i&atel' onstant alon! the s#an% The s#ar are onstant $e#th b"t

bea"se the ben$in! &o&ent varies alon! the s#an the str"t"re is heavier an$ stron!er at the

inboar$ en$%

REAR SAR

The &ain str"t"ral ele&ent of the elevator is the torsion bo1 onsistin! the front s#ar an$ the

rear s#ar% Inter s#ar ribs brae the str"t"re% A seon$ torsion bo1 is for& b' lea$in! e$!e s)in

an$ rear s#ar an$ this is reinfore$ with nose ribs, #arti"larl' at the "t-o"t for the hin!e #oints%

INB0ARD20*TB0ARD ELE3AT0R

At the inboar$ en$ the web is inrease$ in thi)ness with ta#ere$ $o"blers where the stresses are

hi!hest%

ELE3AT0R 4INGE

Elevator str"ts are #re$o&inantl' "n$er tension in fli!ht% B"t, when air#lane is on the !ro"n$ it is

"n$er o&#ression%

/*EL TAN5 END

The "se of f"el tan) has a$vanta!es in that it will #rovi$e relief of the ben$in! &o&ents to

so&e $e!ree an$ this is the reason so&e airraft havin! their &ain tan)a!e in the win!ti#s%



ELE3AT0R 4INGE



Elevator hin!e onsist of two #art the enter ste& an$ l"!s% Elevator hin!e e1#ose to the shear

stress an$ torsion stress% Both stress a##lie$ when #ress"re tr' to se#arate the .oin% Shear stresses

#ro$"e between the ste& an$ l"! that hol$ the o"tboar$ an$ inboar$ elevator with the stabilizer%

Then torsion stress affet the ste& when the o"tboar$ or inboar$ &ove%

40RIZ0NTAL STABILIZER /AIRING



At fli!ht, the horizontal stabilizer fairin! faes the #ress"re with the o&bination of ribs an$

s)in% The a##lie$ #ress"re e1erts a o&#ression stress to the ribs%

TRAILING EDGE BEA6



Trailing edge beam exposed to the two types of stress. The tension stress from it

stems attach to the other part and by shear stress between cap and skin.



*Sample of buttock line, water line and station line



Definition Of 6 Types Structural Loads:

1) STRESSES-

2) TENSION- ri&ar' stress that tries to #"ll bo$' a#art% So&eti&e e1#resse$ to a tensile

stress

) !O"#RESSION- A fore whih tries to s("eeze a #art to!ether

$) %ENDIN&

') TORSION

6) S(ER

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