Airframe Structures Flashcards
The group of metals with have iron as their principal constituent, is?
Ferrous metals(steel)
If ferrous metals contain small quantities of other metals such as nickel, chromium and manganese, as steel alloy is formed such as -
stainless steel
The group of metals having elements other than iron as their principal constituent, is?
non ferrous metals
where small quantities of other metals have been added to the base metal, an -
alloy is formed
Define tension -
the stress that resists the force that tends to pull apart
Define compression -
the stress that tends to resist a “crushing” force
Define torsion -
The force that produces twisting
Define shear -
The stress that resists the force tending to slide one layer of material over another
Define bending -
The combination of compression and tension
Hoop and axial stress is the result of -
pressurisation within an aircraft
considering hoop and axial stress, which one is the radial stress within a tube?
hoop stress
considering hoop and axial stress, which one is the longitudinal stress within a tube?
axial stress
the three causes of a direct chemical attack -
- Battery acid
- Residual flux deposits from welding or brazing
- Caustic cleaning solutions that have become trapped
The cause of electrochemical attack is -
usually water
Ribs are used to -
form the wing shape
A single shell type structure, where all the flight loads are carried by the outer skin, is a -
Monocoque
A stressed skin structure, usually an aluminium alloy, where the outer skin supports some of the load, but is also supported internally by formers and stringers to give both shape and rigidity to the structure, is a?
Semi-monocoque
An oscillation affecting the whole wing structure -
torsional flexural flutter
An oscillation affecting the wing structure due to the twisting effect on the wing by aileron -
torsional aileron flutter
loads imposed on the wing while it is flexing due to the tendency of the aileron to lag behind the up and down movement of the wing as it is flexing. This is called?
Flexural aileron flutter
The component that provides the main structural strength in the wing, running laterally, is called a?
Main spar
The component that gives the aerofoil its shape, in the wing, is called a?
Rib
In the wing Stringers run -
Laterally, or span wise from root to tip.
The material that is conductive in order to heat aircraft windscreens, is called?
Stannic oxide
An aircraft windscreen normally comprise of how many layers?
3 layers
On an aircraft windscreen, the material that separates the tempered class and the stannic oxide is?
A sheet of transparent vinyl
With an aircraft windscreen, what is included to prevent shatter?
A sheet of transparent vinyl
The layer that provides the most strength in a windscreen?
The centre layer
A centilever wing is one that requires -
no external bracing via struts
Bending loads imposed on the fuselage are supported by -
longerons
Bending loads on the wings are supported by -
frames, formers and stingers,
Ribs are assisted in supporting torsional loads by internal -
struts
The primary force is weight, acting vertically from the centre of gravity. On the ground, with the total mass of the aeroplane supported by its undercarriage, this causes -
tension on the upper surface of the wings and compression on the lower surface.
During flight, lift tends to pull the wings up, resulting in -
compression on the upper surface and tension on the lower surface
Stringers run longitudinally and serve to locate the frames and formers as well as provide -
support for the skin, preventing buckling and bending.
