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Aerospace Engineering-mat > Composites 1 > Flashcards

Composites 1 Flashcards

1
Q

What are composites?

A

Two or more materials combined to create unique properties

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2
Q

What are the two parts of a composite?

A

Matrix and filler

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3
Q

What type of composites have the smallest filler?

A

Dispersion-strengthened composites

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4
Q

Job of filler in Dispersion-strengthened composites

A

Stop dislocation movement

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5
Q

What type of composite has medium size filler?

A

Particular composites

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6
Q

What is the purpose of filler in particular composites?

A

mechanical properties of filler influence material

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7
Q

What composite has the biggest size of filler?

A

Fibre-reinforced composites

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8
Q

Why composites?

A

Good strength to weight ratio

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9
Q

What is the job of Fibres?

A

Carries the load

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10
Q

What is the job of the matrix? (3)

A

Binds and protects the fibres, transmits the force equally and ductility

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11
Q

Example fibre materials (4)

A

Whiskers, Ceramics, Metals, Carbon

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12
Q

Most common Matrix material

A

Polymers

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13
Q

Other Matrix material options

A

Metals and Ceramics

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14
Q

Why don’t we use metals as often as polymers as a matrix?

A

Expensive

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15
Q

Why do we use Ceramics and Metals instead of polymers in matrix

A

Higher temperature operation

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16
Q

Why use Ceramics in matrix over Metals?

A

Lighter

17
Q

What’s really important for a composite?

A

Good bonding between matrix and fibre

18
Q

What properties can we use rule of mixtures for?

A

Density, Thermal and Electrical Conductivity

19
Q

What do we have to assume to use rule of mixtures?

A

Randomly oriented continuous fibres

20
Q

Why have short fibres

A

Easier to manufacture

21
Q

Why have long fibres

A

Better at bearing loads

22
Q

What does Fibre orientation affect?

A

Tensile strength

23
Q

How to make polymers isotropic

A

Fibres facing all different directions

24
Q

Using a roller to push matrix and fibre together +heat

A

Hand lay-up

25
Q

Using pressure of air and some rubber to press it together+ heat

A

Pressure bag moulding

26
Q

Two dies of same shape pushed together with FRC in between +heat

A

Matched die moulding

Aerospace Engineering-mat (8 decks)

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