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Airframe Repairs > Composite Materials > Flashcards

Composite Materials Flashcards

1
Q

What is anisotropic?

A

Materials with strength in one direction only

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2
Q

What is Isotropic?

A

Materials that have the same strength in any direction

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3
Q

What are the 4 main dry fibre cloth weave patterns in use?

A

Unidirectional
Plan (or square)
Twill
Satin

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4
Q

What are the advantages of composite materials?

A

High strength to weight ratio

High stiffness

Fatigue resistance

Design flexibility

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5
Q

Disadvantages of composite materials?

A

Low impact damage

Degradation from fuels, oils, lubricants and UV light (environmental damage)

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6
Q

What environmental damage are composite materials prone to?

A

Fuels
Oils
Lubricants
UV Light

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7
Q

What five fibres are used in composite construction?

A

Glass fibre
Boron fibre
Carbon fibre
Aramid fibre
High performance polyethylene

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8
Q

Whats pre preg composites?

A

Pre impregnated with a matrix material.

Advantages - formability prior to its cure, good strength after cure

Disadvantages - refrigeration & special handling required

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9
Q

Whats wet lay-up?

A

Dry fabric saturated with matrix material (bonding) then stacked one ply at a time. Can be stored at room temperature for longer as resin can be mixed immediately prior to use.

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10
Q

Whats fibre orientation?

A

A manufacturer can tailor the directional strength and stiffness by simply changing the direction of the lay of the ply layers within it.

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11
Q

Disadvantages of composites?

A

Low impact resistance
BVID

Can be affected by:

Excess heat and moisture
Fuels, oils, lubes, and UV Light

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12
Q

What can wind erosion do to composite materials?

A

Panel edge delamination

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13
Q

What can sand erosion do to composite materials?

A

Severe abrasion damage

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14
Q

How can maintenance activities harm composites?

A

Careless over tightening of screws

Dropped tools/ components

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15
Q

Physical damage types on composite materials?

A

Collison
Weather
Sand erosion
Wind erosion
Careless Maintenance
Incorrect handling
Overheat damage
Hot air leaks
Lightning strike
Chemical damage

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16
Q

Common composite materials components on aircraft?

A

Cabin roof
Fairings
Panels
Doors
Armoured seats
Rotor blades

17
Q

What PPE should be worn during CM handling?

A

Eye protection
Gloves
Aprons
Respirators

18
Q

What material has conductivity that electrical components need to be protected against from contamination by its dust or fibres

A

Carbon fibre

19
Q

Why do we not use solvents to remove resin from our skin?

A

Solvents dissolve natural skin oils that result in drying and cracking of skin rendering it susceptible to infection.

20
Q

Whats HEPA?

A

High efficiency particulate air

Used for high dust generating activities

21
Q

Where should liquid resins and pastes be mixed?

A

In an exhaustive hood

22
Q

How close should an emergency eye wash station be to areas working with composites?

A

30m (100ft)

23
Q

Personal hygiene when working with composites:

A

Wash with soap and water before breaks and end of shift.

Don’t eat smoke drink in composite work areas.

Disposable coveralls discarded or reusable washed separately

24
Q

How do you clean liquid resins and paste adhesives from work areas?

A

Solvents

25
Q

How to clean composite dust from work areas?

A

Using a HEPA vacuum, DO NOT dry sweep or use forced air.

26
Q

What to do if you get resin in eyes?

A

Flush with water for 15 minutes
Remove contact lenses
Seek medical attention along with SDS

27
Q

What to do if resin is inhaled?

A

Remove person to fresh air at once, seek medical attention with SDS

28
Q

What action should you take in event of a runaway exothermic reaction?

A

Do not handle or approach container or attempt to control reaction

Do not breathe toxic gases

Evacuate area immediately, do not return until reaction is complete

Ventilate workspace to remove toxic exothermic reaction product

29
Q

How should you dispose of carbon fibre materials?

A

Packaged and placed in a landfill authorised, by the appropriate authority.

Specific waste bin in the workshop marked ‘carbon fibre waste only’.

Do not incinerate

30
Q

How to deal with heat blanket fires?

A

Turn off power to HBC

Extinguish with dry chemical or carbon dioxide

Evacuate area, call fire service

Airframe Repairs (11 decks)

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