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Materials And Hardware > Composties And Non-Metallic > Flashcards

Composties And Non-Metallic Flashcards

1
Q

What is a composite?

A

Two or more materials combined to form a much stronger structure
A matrix
A reinforcing material

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2
Q

Advantages of composites

A

High strength to weight ratio
Reduction in parts and fasteners
Reduction of wear
Corrosion resistant

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3
Q

Disadvantages of composites

A

Expensive

Not easy to repair - trained staff required

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4
Q

What do reinforcing materials give?

A

Strength

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5
Q

What is Nomex?

Advantages?

A

Fibre.

High thermal stability, temperature and flame resistant

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6
Q

What is fibreglass made from? How?

A

Molten silica glass. Spun together and woven into a cloth

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7
Q

Advantages of fibreglass

Disadvantages

A

Low cost

Weighs more than other fibres
Less strength than other fibres

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8
Q

Two most common types of fibreglass?

A 
E glass (electricity resistant) 
S glass (very high tensile strength)
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9
Q

What is primary, secondary, and tertiary?

Examples?

A

Primary - critical area
Secondary - not safety critical
Tertiary - not safety critical

Engines
Fuselage
Doors

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10
Q

What colour is Aramid?

Advantages?

A

Yellow

Light weight
Excellent tensile strength
Heat resistant up to 260C
Good chemical resistance

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11
Q

Advantages of Kevlar?

Disadvantages?

A

Man made organic fibre
High tensile strength and flexibility

Difficult to cut
Absorbs up to 8% moisture

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12
Q

Advantages of Carbon Fibre (CFRP)

A

High strength
High E module
Low density
Electrically conductive

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13
Q

What is Warp?

A

Thread runs along the length of the fabric

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14
Q

What is Weft/fill?

A

Runs perpendicular to the warp fibres

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15
Q

What is Selvedge?

A

Tightly woven edge which runs parallel to the warp edge

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16
Q

What is Bias?

A

Runs at 45 degrees to the warp threads

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17
Q

What is Uni Directional?

A

One direction

18
Q

What is Bi Directional?

A

Two or more directions

19
Q

What is Quasi-isotropic?

A

Uni and Bi and diagonal altogether

20
Q

What do New Matrix Materials have?

A

Good stress distribution
Heat resistant
Chemical resistant
Good durability

21
Q

What are Resins?

A

A type of plastic broken into two categories:

Thermoplastic
Thermosets

22
Q

What are Thermoplastics?

A

Use heat to form the part into a specified shape, and this shape is not permanent

23
Q

What are Thermosets?

A

Once heated, form a permanent shape, cannot be reformed. Most common one used

24
Q

Two types of Resins?

A

Epoxy

Phenolic

25
Q

Advantages of a Thermoset resin?

A

Good strength and resistance to moisture and chemicals
Good for bonding non-porous and dissimilar materials
Used in prepreg materials

26
Q

Safety Precautions with electrical bonding of components

A

Flame spray
Bonding jumpers
Aluminium wires woven into top layer
Aluminium foil sheet bonded to top layer

All dust is harmful
Wear all PPE

27
Q

Three types of plastic

A

Polymerisation
Polycondensation
Polyaddition

28
Q

What is Polymerisation?

A

Carried out in the presence of a catalyst, creating a chemical reaction, this creates Monomer from polymers. No waste by products

Polythene

29
Q

What is Polycondensation

A

Chemical reaction between two similar and dissimilar units

Polyester

30
Q

What does an Adhesive do?

A

Bonds two or more surfaces together

31
Q

Advantages of Adhesives

A

Economical
Distribute stress at bonding point
No need for fasteners
Moisture and Corrosion resistant

32
Q

What does the moisture and corrosion resistance of an adhesive depend on?

A

Resistance to slippage and shrinkage
Malleability
Cohesive strength
Surface tension

33
Q

Types of adhesive

A 
Synthetic 
Thermosetting 
Thermoplastic 
Solvent 
Plastic
34
Q

Two thixotropic agents?

A

Micro balloons - diameters from 10 to 300 micron balls, forms a paste, trowelled onto surface, sanded/filed

Aerosol - white powder

35
Q

What does a Resin Adhesive do?

A

Ensures cohesion of composite material

36
Q

What are the four most common Resin Adhesives?

A

Polyester
Epoxy
Vinyl Ester
Phenolic

37
Q

How are Epoxy Hardeners cured?

A

Chain reaction linking resin molecules

38
Q

Disadvantages of Epoxy hardeners?

A

Toxic - can cause dermatitis

39
Q

What is shelf life?

A

Storage time

40
Q

What is pot life?

A

How long after mixing, a substance can be used

Materials And Hardware (11 decks)

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