Fatigue and Stress | The Fuselage

Question 1

Older aircraft may be made of ____

Answer 1

• Truss
  or
• Frame and skin

Question 2

Trusses consist of ___

Answer 2

• Longerons
• Diagonal braces
• Vertical braces

Question 3

Truss constructions are ___ and take up ___ space

Answer 3

heavy much

Question 4

Monocoque means ___

Answer 4

single shell

Question 5

Monocoque is ___ and means ___ space

Answer 5

light more

Question 6

Monocoque construction is best for ___, __ fuselages

Answer 6

Long narrow

Question 7

Semi-monocoque uses ___ and ___ to keep a light framework of vertical formers and bulkheads apart.

Answer 7

longerons stringers

Question 8

Bulkheads absorb the ___ and ___ stresses, whilst the skin absorbs ___ stresses

Answer 8

tensile compression torsional

Question 9

Most of the applied stresses are dissipated by the ___ components; a small percentage is absorbed by the ___

Answer 9

internal skin

Question 10

The ___ maintain the shape of the fuselage, and ___ stiffen the metal to prevent it buckling

Answer 10

formers stringers

Question 11

____ take the main stresses

Answer 11

Longerons

Question 12

Bulkheads are similar to formers, but placed ___

Answer 12

either end of the fuselage or compartment

Question 13

Bulkheads are designed to transmit ___ ___

Answer 13

concentrated loads

Question 14

Frames are designed to maintain ____

Answer 14

rigidity

Question 15

A firewall can be a ___, or a fireproof partition separation an engine compartment from the cabin.

Answer 15

bulkhead

Question 16

Engine compartment decking and firewalls are typically made of ___ ___ or ____

Answer 16

stainless steel or titanium

Question 17

Stressed skin uses high strength ___ or ___ ___ to cope with normal bending and tangent stresses, and torsional moments.

Answer 17

magnesium aluminium alloys

Question 18

Methods of attachment include:

Answer 18

• Riveting
• Welding
• Bolting
• Pinning
• Adhesives

Question 19

___ ___ rivets are light, small, and strong in shear.

Answer 19

Aluminimum alloy

Question 20

Black stuff from rivets is power from ___ against the aircraft skin

Answer 20

fretting

Question 21

Loose rivets can indicate ____ ____

Answer 21

excessive vibration

Question 22

Pressurisation creates ___/____ stresses

Answer 22

hoop circumferential

Question 23

The fuselage of large aircraft are usually ____ construction

Answer 23

semi-monocoque

Question 24

Longitudinal strength and rigidity may be supplemented by a ___ ___ which runs along the fuselage centreline through the wing centre section

Answer 24

kneel beam

Question 25

The area rule states that the cross section should increase and decrease ___ either side of the maximum point

Answer 25

gradually

Question 26

Adding wings to a fuselage increases the cross sectional area very ___

Answer 26

suddenly

Question 27

The sudden increase in cross-sectional area caused by the wings can be countered by ___ the fuselage at the same time, this ___ wave drag

Answer 27

narrowing reduces