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Module 6 > Aircraft Materials - Composite And Non-Metallic > Flashcards

Aircraft Materials - Composite And Non-Metallic Flashcards

1
Q

Over extended honeycomb can bend in which direction?

A

Along the ribbon

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2
Q

Fibre weave strength is greatest in the direction of the

A

Warp

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3
Q

Which core material will be used in the making of a composite material flat panel?

A

Hexagonal core

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4
Q

Which of the following could best be manufactured from Perspex panel?

A

A passenger window

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5
Q

Kevlar and Nomex are types of

A

Advanced composite

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6
Q

The practical strength of fibreglass is

A

Along the fibre

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7
Q

Sound is best absorbed by a material which is

A

Soft and porous

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8
Q

Polyester resin and glass fibre cloth, becomes

A

GRP

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9
Q

A thermoplastic can be

A

Reheated and reformed more than once

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10
Q

Sandwich panels made of metal honeycomb construction are used on modern aircraft because this type of construction

A

Is lighter than a single sheet skin of the same strength and is more corrosion resistant

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11
Q

A category of plastic material that is capable of softening or flowing when reheated is described as a

A

Thermoplastic

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12
Q

The classification of high tensile strength fibreglass used in aircraft structures is

A

S-glass

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13
Q

Which is the identifying characteristic of acrylic plastics?

A

Acetone will not soften, but will cloud the surface

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14
Q

The classification for fibreglass reinforcement material that has high electrical resistivity and is commonly used in circuit boards is

A

E-glass

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15
Q

Composite fabric material is considered to be the strongest in what direction?

A

Warp

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16
Q

What are general characteristics of aramid fibre (Kevlar) composites?

A

High tensile strength, flexibility, stiffness and ability to conduct electricity

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17
Q

What generally characterises carbon/graphite fibre composites?

A

Stiffness, high compressive strength and corrosive effect in contact with aluminium

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18
Q

What is true about thermosetting plastics?

A

Once moulded into shape they become set and cannot subsequently be softened by reheating

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19
Q

Which fibre is susceptible to the ingress of moisture?

A

Kevlar

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20
Q

In a composite repair lay-up, how much should each layer extend beyond the layer below it?

A

1/2 inches

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21
Q

What is the effect of heat on a cold cure resin?

A

Decrease pot life

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22
Q

If you increase the amount of catalyst in a resin mixture

A

The pot life will be decreased

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23
Q

What two components of a three part polyester resin are dangerous to mix together directly?

A

Accelerator and free catalyst

24
Q

What is the effect of adding too much hardener to a resin?

A

Makes the repair more brittle

25
Q

An air driven router is used to remove honeycomb material repairs

A

When one outer skin is damaged

26
Q

What do you do if you forget to add hardener to a composite repair?

A

Remove all resin and start again

27
Q

Why would you use microballoons as a filler?

A

It is the lightest filler material

28
Q

What does MSDS stand for?

A

Material safety data sheet

29
Q

Damaged honeycomb undergoing repair can be removed with

A

A router

30
Q

The pot life of a cold cured resin

A

Decreases with an increase in temperature

31
Q

Thermosetting adhesive, during their curing cycle give off

A

Heat

32
Q

The effect of a lower temperature than ambient during the curing period of a resin, will cause the curing time to

A

Increase

33
Q

Use of excessive hardener in polyester resin leads to

A

Reduced pot life

34
Q

The maximum length of a component is held in stores is known as the

A

Shelf life

35
Q

What is the separation of an aramid panel layers described as?

A

Delamination

36
Q

Tap testing a sandwich panel construction

A

Is crude, but works remarkably well

37
Q

Which product is a serious health hazard when handling?

A

Asbestos

38
Q

Aircraft transparent plastics are cleaned using

A

Warm soapy water, rinsed and dried

39
Q

A thermosetting adhesive

A

Undergoes a chemical transformation and creates an insoluble substance

40
Q

Metal fasteners used with carbon/graphite composite structures

A

Must be made of materials such as titanium or corrosion resistant steel

41
Q

Which methods can be used to inspect fibreglass/honeycomb structures for entrapped water?

A

X-ray and back-lighting

42
Q

When balsa wood is used to replace a damaged honeycomb core, the plug should be cut so that

A

The grain is perpendicular to the skin

43
Q

One of the best ways to assure that a properly prepared batch of matrix resin has been achieved is to

A

Have mixed enough for a test sample

44
Q

What are the advantages of using microballoons in repairs to laminate honeycomb sandwich panels?

A

Less density, lower stress concentrations

45
Q

The length and time that a catalysed resin will remain in a workable state is called the

A

Pot life

46
Q

One method of inspecting a laminated fibreglass structure that has been subjected to damaged is

A

Strip the damaged area of all paint and shine a strong light through the structure

47
Q

When inspecting a composite panel using the ring test/tapping method, a dull thud may indicate

A

Separation of the laminates

48
Q

What reference tool is used to determine how the fibre is to be oriented for a particular ply or fabric?

A

Warp clock

49
Q

The strength and stiffness of a properly constructed composite lay-up depends primarily on

A

The orientation of the plies to the load direction

50
Q

What is the material layer used within the vacuum bag pressure system to absorb excess resin during curing called?

A

Bleeder

51
Q

Fibreglass damage that extends completely through a laminated sandwich structure

A

Must be repaired

52
Q

Fibreglass laminate damage that extends completely through one facing and into the core

A

Requires replacement of the damaged core and facing

53
Q

When added to wet resins, what provides strength for the repair of damaged fastener holes in composite panels?

A

Cotton flock and chopped fibres

54
Q

The part of a replacement honeycomb core that must line up with the adjacent original is the

A

Ribbon direction

55
Q

What is the definition of cure time?

A

The time required for the mixed compound to reach an initial rubbery state
OR
The period after which the surface of the compound no longer exhibits adhesive properties

56
Q

In order to prevent dermatitis caused due to contact with polymer resin, one should

A

Remember to close the autoclave door during curing
OR
Use disposable gloves

57
Q

What would be used where a high temperature application is required, e.g. a firewall?

A

Ceramic fibres

Module 6 (14 decks)

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