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M6 > M6.3 > Flashcards

M6.3 Flashcards

1
Q

Define composite?

A
  • 2 or more materials combined to increase properties
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2
Q

Simplest composite consists of what 2 elements?

A
  • matrix (adhesives or resins)
  • reinforcing material (fabric)
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3
Q

Advantages of fibreglass?

A
  • less expensive than other composites
  • does not conduct electricity
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4
Q

What are the 2 most common types of fibreglass?

A
  • E-glass
  • S-glass
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5
Q

What are the 2 types of aramid (Kevlar)?

A
  • Kevlar 29
  • Kevlar 49
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6
Q

Advantages of aramid (Kevlar) fibres?

A
  • low density
  • flexible
  • strong
  • heat resistance up to 260*c
  • non-flammable
  • good chemical resistance
  • good resistance against abrasion
  • high toughness
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7
Q

Carbon fibre advantages?

A
  • high strength
  • low density
  • low fracture resistance
  • high resistance against temp
  • good electrical conductivity
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8
Q

Advantages of Boron?

A
  • high compressive strength
  • strong
  • high stiffness
  • hard wearing
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9
Q

Describe warp ?

A
  • length of fabric
  • usually stronger than weft as it has more threads
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10
Q

Describe weft?

A
  • run perpendicular to warp fibres
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11
Q

Describe selvedge edge?

A

-tightly woven edge
- runs parallel to warp threads
- used to prevent edges from unravelling

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12
Q

Describe bias?

A
  • Runs at 45* angle to warp threads
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13
Q

What are the common reinforcing fibres used in aviation?

A
  • fibreglass
  • aramid
  • boron
  • carbon fibre
  • ceramic
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14
Q

What are the common types of fabric weaves?

A
  • plain weave
  • satin weave
  • twill weave
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15
Q

Thermoplastic?

A
  • Heat used to form a shape but it is not permanent
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16
Q

Thermosetting?

A
  • Once heated, it is permanent (cannot be reversible)
17
Q

What are the 2 fibre reinforced composites?

A
  • laminated composites
  • sandwich composites
18
Q

What are laminate composites?

A
  • 2 or more layers of reinforcing material bonded together
19
Q

What are sandwhich composites?

A
  • core bonded between 2 thin fibreglass sheets
20
Q

What’s the advantage of a sandwhich composite over a laminated composite?

A
  • extremely high strength to weight ratio
  • at least x10 stronger and weight increased x6
21
Q

Advantages of plastic in aviation industry?

A
  • lightweight
  • corrosion resistance
  • impact resistance/chemical resistance
  • Durable
22
Q

Transparent plastics can be manufactured in 2 forms?

A
  • Monolithic
  • Laminated
23
Q

What is the purpose of fabric orientation?

A

Dictates the strength

24
Q

What are the 3 characteristics of damage classification for composites?

A

Negligible
Repairable
Non-repairable

25
Q

What is a one part sealant?

A
  • ready to use (prepared my manufacturer)
26
Q

What is a two part sealant?

A

-requires base sealant and accelerator
- requires mixing

27
Q

What does storing the film adhesive in a freezer do to the resins cure rate?

A
  • slows down
28
Q

If the resin is left out at room temperature what will happen?

A
  • It will cure
29
Q

Examples of NDT testing?

A
  • visual inspection
  • audible testing
  • Ultrasonic inspection
  • Radiography inspection
  • Thermograph
  • Dye penetrants
  • moisture detector
30
Q

What is cosmetic defects?

A
  • outer surface skin damage (minor)
  • no structural damage
31
Q

What does BVID stand for?

A

Barely invisible impact damage

32
Q

What are the 5 basic composite repairs?

A
  • pre cured patches
  • potted
  • resin injection
  • laminated repair (one surface)
  • laminated repair (through part)
33
Q

What are the 4 major types of plastic failure?

A
  • Environmental failure
  • Thermal failure
  • Chemical failure
  • Mechanical failure
34
Q

What is ‘stop drilling’?

A
  • It prevents further cracking from occurring
  • Required to drill holes on the ends of each crack with a 1/8 drill bit

M6 (10 decks)

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