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AGK Systems > Airframe Design and Materials > Flashcards

Airframe Design and Materials Flashcards

1
Q

Minor Failure

A

Probable

10^3

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2
Q

Major Failure

A

Remote

10^5

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3
Q

Hazardous Failure

A

Extremely Remote

10^7

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4
Q

Catastrophic Failure

A

Extremely Unprobable

10^9

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5
Q

Safe Life

A

The life of an aircraft which it will not suffer catastrophic failure.

May be used during a declared number of cycles or flight hours.

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6
Q

Fail Safe

A

The load is carried by other components if a part of the structure fails.

The limited amount of time that an aircraft can carry a failed load.

Can be carried until the next periodic inspection.

“PARALLEL LOAD PATHS”

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7
Q

Damage Tolerant structure

A

Load is spread over a large area.

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8
Q

Bending

A

The total combination of tension, compression and shear.

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9
Q

Tension

A

The outer edge stresses.

Can cause pulled rivets.

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10
Q

Compression

A

The inner edges squeezing together.

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11
Q

Shear

A

Occurs across the structure as forces try and tear it.

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12
Q

Stress

A

The internal force per unit area inside structural part, as a result of external loads

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13
Q

Strain

A
  • The quantifiable effects of stress

- The Deformation caused by the action of stress on a material

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14
Q

Buckling

A

Deformation occurring to a thin sheet after compressive forces.

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15
Q

What is a Stringer used for?

A

L shape metal that is bonded to skin.

Will PREVENT BUCKLING

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16
Q

Design Limit Load CS25

A

The maximum load the designer expects the aircraft to experience in service.

2.5g

Ultimate load = 2.5g x 1.5 = 3.75g

17
Q

Dynamic Load

A

Builds up quickly due to changes in flight conditions.

Produced when manoeuvring

Can be severe.

18
Q

Static Load

A

Build up slowly, fairly constant

19
Q

When does maximum stress occur at the wings?

A

Maximum stress occurs with empty wing tanks

20
Q

What provides bending relief at the wing roots?

A

Ailerons

Fuel in wings

Underslung engines.

21
Q

What does the Wohler Curve exhibit?

A

Relationship between stress and cycles to Failure

22
Q

Stress Corrosion

A

Combination of stress & corrosion.

Causes by fatigue.

Unpredictable and quick

23
Q

What determines the number of cycles to failure?

A

The amplitude or size of load

24
Q

Define an Alloy

A

A combination of two or more metals providing properties we didn’t have previously

25
Q

Properties of an alloy

A

Elasticity

Plasticity

Strength

Stiffness

26
Q

Most common materials for alloys

A

Aluminium
Titanium
Magnesium
Steel

27
Q

What is the most common alloy used in today’s modern manufacturing?

A

Duralumin

28
Q

Properties of Duralumin

A

A copper-based aluminium alloy

Good strength to weight ratio

It’s more susceptible to corrosion difficult to weld however

29
Q

Alclad

A

Improvement to Duralumin

Aluminium coating on its surfaces

Duralumin gives it strength; Pure aluminium protects the Duralumin

30
Q

What is steel composed of?

A

Iron and carbon

31
Q

What are composite materials?

A

Two more materials with properties that are different to the original elements

Consist of matrix, bulk, reinforcement

The reinforcement is fibre.

32
Q

Properties of composite materials?

A

Light weight
Rigidity
Strength

33
Q

Why is the nosecone made from glass fibre?

A

Allows for radio waves to pass through, transparent.

34
Q

Properties of Aramid/Kevlar

A

Impact proof

35
Q

What is fibrelam used for

A

Flooring

36
Q

Disadvantage of a honeycomb/sandwiched flooring

A

Not suitable for concentrated loads, loads must be spread.

37
Q

Hard Time Maintenance

A

A component that is overhauled or replaced after a set number of hours, cycles or operations.

38
Q

On Condition Maintenance

A

Visually check if performance is acceptable.

Without disassembly, or removal from service.

39
Q

Framework / Truss Fuselage

A

Frame takes all the loads

AGK Systems (10 decks)

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