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M6 > 6.3 Aircraft Materials - Composite and Non - Metallic > Flashcards

6.3 Aircraft Materials - Composite and Non - Metallic Flashcards

1
Q

What is the calculation for Fahrenheit to Centigrade?

A

C = (°F − 32) × 0.555

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2
Q

What is the calculation for Centigrade to Fahrenheit?

A

°F = °C × 1.8 + 32

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3
Q

What is the description of the word composite?

A

Two or more materials that are combined to form a much stronger structure than either material by itself

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4
Q

What are the two most common elements of a composite?

A
  • Matrix

- Reinforcing Material

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5
Q

What are the advantages of composite?

A
  • High strength-to-weight ratio
  • Reduction of parts and fasteners
  • Reduction of wear
  • Corrosion resistance
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6
Q

What are the disadvantages of composite?

A
  • Generally expensive

- Not easy to repair; well-trained sta , tools, equipment and facilities are required to repair composite components.

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7
Q

What gives the major strength to the composite component?

A

reinforcing material

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8
Q

What type of material in Nomex

A

An infusible, wholly aromatic* polymer

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9
Q

How is aromatic polymer manufactured

A

As a fibre only

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10
Q

What are the advantages of Nomex?

A

Very high thermal stability and temperature and flame resistant. Along with highly radiation proof

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11
Q

How is fiberglass made?

A

Small strands of molten silica glass and than spun together and woven into cloth

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12
Q

What properties does E-glass have?

A

Resistant to electricity

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13
Q

What properties does S-glass have?

A

Very high tensile strength

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14
Q

What are the characteristics of glass fibre?

A

◦ Low density (2.1 g/cm3)
◦ High Strength
◦ Hight fracture toughness
◦ Circular cross-section and smooth surface
◦ Good ‘wet out’
◦ The bre does not absorb water/humidity
◦ The bre is not ductile (ceramic properties)
◦ For sanding, aluminium-oxide or silicon-carbide sand paper can be used. Silicon-carbide will last longer than aluminium-oxide
Glass Fibre Prepreg

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15
Q

What colour are aramid fibres?

A

Yellow

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16
Q

What is the full name of aramid

A

aromatic polyamide

17
Q

What material will be used to repair aramid damage

A

fibreglass

18
Q

Is aramid good in tensile or compressive loads

A

tensile

19
Q

What are the characteristics of aramid fibres?

A 
◦ Low Density (1.45 g.cm3)
◦ High tensile strength
◦ Heat resistance up to 260°C
◦ Non- ammable and non-fusible
◦ Good chemical resistance
◦ Very good resistance against abrasion
◦ High toughness
20
Q

Is kevlar man-made or natural?

A

Man-made

21
Q

What are the disadvantages of Kevlar?

A

The fibres themselves absorb moisture, making Kevlar composites more sensitive to the environment. Although tensile strength and modulus are high, compressive properties are relatively poor. Kevlar is also very di cult to cut. Special scissors are needed for cutting dry fabric and special drill bits for drilling cured laminates.

22
Q

What happens to Kevlar when exposed to UV?

A

It turns brown

23
Q

What is stronger under compression… Kevlar or Graphite?

A

Graphite

24
Q

What material should fibreglass be kept from?

A

Aluminium

25
Q

What is the two-part system for resins?

A
  • Resin

- Hardener (catalyst)

26
Q

What are the two types of plastics?

A
  • Thermoplastic

- Thermoset

27
Q

At what temperature does Thermoplastic remould?

A

750F

28
Q

What is an example of Thermoplastic?

A

Acrylic

Plexiglass

29
Q

What is an example of Thermoset?

A

Bakelite

30
Q

Is Epoxy resin thermoset or thermoplastic?

A

Thermoset

31
Q

What are the two types of honeycomb fabrication?

A
  • Corrugation

- Expansion

32
Q

What does the ribbon direction denote on Honeycomb cores?

A

The direction the honeycomb can be pulled apart

33
Q

What are the four ways of dissipating electrical charge?

A
  • Flame spray
  • Bonding jumpers
  • Aluminium wires woven into the top layer
  • Thin aluminium foils bonded to the top layer
34
Q

What is a monomer in plastic creation

A

A molecule of one of the gaseous hydro-carbons in the manufacture of plastic:

Ethylene.

35
Q

What are 2+ molecules of Ethylene joined together called

A

Polymer

36
Q

What by-products are created from polymerisation?

A

None

M6 (4 decks)

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