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Airframe Volume 1 > Composits > Flashcards

Composits Flashcards

1
Q

What are the two types of composites materials

A

Reinforcing
Matrix

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2
Q

What does reinforcing materials consist of

A

Tapes, woven into fabric, or grouped together into a loosely compacted mat

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3
Q

What are the three types of reinforcing materials

A

Fiberglass
Kevlar
Graphite

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4
Q

What are the two types of fiberglass

A

S glass
E glass

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5
Q

How are fiberglass materials made of

A

Drawn from molted glass and spun together and woven into shiny, white cloth

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6
Q

What is Kevlar

A

Used to replace fiberglass. Strength of a similar metal part and is lighter weight

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7
Q

What is an advantage of Kevlar

A

Flexibility under a load and ability to withstand impact, shock, and vibration

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8
Q

What is graphite

A

A form of carbon. Structural graphite is used in composite structures because of strength and stiffness

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9
Q

Where is graphite used

A

Primary structures where high strength and rigidity are prime considerations

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10
Q

Can graphite be bonded over aluminum

A

Yes but use with caution

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11
Q

How do you improve the strength of fibers

A

Take the grain and turn it 45 degrees and 90 degrees

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12
Q

What are the two types of fiber directions

A

Unidirectional
Bidirectional

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13
Q

What is a unidirectional fabric

A

All the threads run the same way aka warp direction and have small cross threads running across them

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14
Q

What is fill threads

A

Used to hold the unidirectional warp pieces together 

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15
Q

What is bidirectional fabrics

A

Interlaced fill threads with the warp threads as the fabric is being woven into looms

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16
Q

What is a hybrid fiber

A

A fiber composed of different types of fibers woven together to obtain special characteristics

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17
Q

What is one of the most common hybrid fibers

A

Kevlar and graphite

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18
Q

What is matrix

A

Material used in composite construction to bind the fibers together and to transmit the forces into the fibers.

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19
Q

What is a common matrix

A

Resin

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20
Q

What are the two basic types of resins

A

Thermoplastic
Thermosetting

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21
Q

How does thermoplastic resins work

A

Heat is used to shape the component and then when cools it take the shape it was formed to

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22
Q

How does thermosetting work

A

It uses heat to cure the part to take its shape form.

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23
Q

What are the two types of thermosetting resins

A

Polyester
Epoxy

24
Q

What is polyester resins typically used with

A

Fiberglass

25
Q

Where does polyester resin typically used

A

They are used on non structural components and are low cost

26
Q

What are the parts that make up a polyester resin

A

Resin
Catalyst

27
Q

What does epoxy resin use

A

Resin
Catalyst

28
Q

What is pre impregnated materials

A

A type of composite material in which the reinforcing fibers are encapsulated in an uncured resin

29
Q

What is an adhesive

A

A resin that is used to bond parts together

30
Q

What is an adhesive made up of

A

Catalyzed resin that is formed into a thin film

31
Q

How is adhesive cured

A

By heat and pressure

32
Q

What is foaming adhesives used for

A

Bond sections of honeycomb core

33
Q

What are the two basic types of foam used in aircraft structures

A

Styrofoam
Urethane

34
Q

How is styrofoam cut

A

By the use of a hot wire cutter

35
Q

What is an advantage of urethane foam

A

It is fuel proof

36
Q

How is urethane foam cut

A

A sharp knife or scissors

37
Q

What type of resin are used with styrofoam

A

Epoxy

38
Q

What types of resin can be used with urethane foam

A

Either epoxy or polyester

39
Q

Where is honeycomb most likely used at

A

High performance applications

40
Q

What type of stress is put on the honeycomb

A

Compressive

41
Q

What is ribbon direction

A

The direction in a piece of honeycomb material that is parallel to the length of the strips of material that makes up the core

42
Q

What is a filler

A

Used to change the resin into a syrup or paste

43
Q

What is the most common type of filler

A

Micro balloons

44
Q

What are the three ways to apply heat and pressure

A

Matched dies
Vacuum bag
Autoclave

45
Q

What is an autoclave

A

A pressured vessel inside of which air can be heated to a high temperature and pressure raised to a high value.

46
Q

What do you use to make repairs and inspections on composite materials

A

Structural repair manual

47
Q

What is delamination

A

The separation of the layers of a laminated material

48
Q

What are ways to find delamination

A

The coin tap test
X ray
Ultrasonic inspection
Back lighting

49
Q

What is an indication of delamination

A

A dull thud

50
Q

What are the two types of cures for repairing composites

A

Room temp cure
Hot temp cure

51
Q

What is a warp clock used for

A

Shows the orientation of the plies of a composite material

52
Q

What is a parting film

A

A layer of thin plastic material placed between a composite lay up and the heating blanket. It prevents the blanket from sticking to the fabric

53
Q

What is a bleeder used for

A

It absorbed the excess resin forced out by ply fibers

54
Q

How do u drill graphite

A

Spade drill

55
Q

What is some typical safety procedures when dealing with composites

A

Use a respirator
Safety glasses
Wear latex gloves

Airframe Volume 1 (6 decks)

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