Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Cat A Module 6 > 6.3 - Composite/Non Metallic > Flashcards

6.3 - Composite/Non Metallic Flashcards

1
Q

What are the two basic elements of a composite and what do they do?

A

Matrix:

  • bonding substance
  • transfers stress to the fibre

Reinforcing material(fabric)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the advantages and disadvantages of composites?

A

+high strength to weight ratio
+reduction in fasteners
+corrosion resistance

  • expensive
  • not easy to repair
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the main purpose of the reinforcing material?

A

Gives the major strength to the composite material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is Nomex used for?

A

Flame-proof clothing due to its high heat resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the two main Fibreglass types and what are their perks?

A

E-glass: electricity resistant

S-glass: high tensile strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the main characteristics of fibreglass?

A
  • low density
  • high strength
  • NOT water/humidity resistant
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the main characteristics and uses of Aramid?

A
  • yellow
  • light weight
  • high tensile strength
  • non-flammable
  • used in high vibration/stress areas
    e. g. props
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the main uses of Kevlar?

A

Bulletproof vests

Belts for radial tyres

Cables

Reinforced composites for aircraft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the main disadvantages of Kevlar?

A

-fibres absorb moisture
-not compression
resistant
-difficult to cut
-UV sensitive(turns brown)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is main property of Carbon Fibre?

A

Electrical conductivity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the orientation of the Warp?

A

Threads run along the length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the orientation of the Weft?

A

Perpendicular to the Warp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the selvage edge?

A

Tightly woven edge, runs parallel to the Warp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the bias?

A

Runs 45deg to the Warp, allows for the creation of complex contours.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are Unidirectional Fibres?

A

The major fibres run in the direction of the Warp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are Bi-Directional Fibres?

A

The fabric runs in two or more directions

17
Q

What is the newer type of matrix?

A

Epoxy resins

18
Q

What are the two categories of Resins?

A

Thermoplastics

Thermosets

19
Q

What is a thermoplastic?

A

Once heated, the final shape is not permanent

20
Q

What is a thermoset?

A

Once heated the final shape is permanent

21
Q

What is an Epoxy resin?

A

A type of thermoset plastic resin, used to bond dissimilar materials

22
Q

What is Prepreg?

A
  • Pre-impregnated fabrics
  • already have the resin in them
  • stored in a freezer
23
Q

What is a ‘sandwich’ construction?

A

The core is bonded between two thin sheets, makes a light weight, rigid structure

24
Q

What are the two honeycomb fabrication processes?

A
  • corrugated

- expansion

25
Q

What is Polymerisation?

A

Creating a long chain of Molecules from small Monomers, doesn’t create any by-products.

26
Q

What is Polycondensation?

A

Removes by-products such as water/acids

27
Q

What is Polyaddition?

A

Reaction of different molecules when reactive groups are brought together.

28
Q

What is a Thixotropic agent?

A

A thickening agent

29
Q

Name two examples of Thixotropic agents?

A

Micro-balloons

Aerosil

30
Q

What considerations must taken when mixing resins?

A

Never mix in a wax container

Always weigh at an ambient temperature

Mix between 3 and 5 minutes

Do not mix too quickly, bubbles may form

31
Q

What is BVID?

A

Barely Visible Impact Damage

32
Q

What is Delamination?

A

The separation of composite surfaces, damage may not be visible on the surface.

33
Q

Name examples of NDT’s

A 
Tap testing
Visual
Bond tester
Ultrasonic
Radiography (X-ray)
34
Q

What must be remembered when removing surface protection?

A

Always use mechanical methods, chemical methods can deteriorate the resin.

35
Q

What is Wet Lay-Up?

A

The application of several layers of resin impregnated fabric over a damaged area.

Cat A Module 6 (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions