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Materials > Composite Materials > Flashcards

Composite Materials Flashcards

1
Q

_______ is the combinations of two or more materials that differ in composition or form.

Elements do not mix or dissolve but it remains identifiable.

A

Composites

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2
Q

What is the usual bonding substance used for composites?

A

Matrix

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3
Q

Where does the strength of a composite structure comes from?

A

Reinforcing Material

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4
Q

What is the third element of a composite between matrix and reinforcing material?

A

Interface

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5
Q
  • Very high strength to weight ratio
  • Easy to produce complex and aerodynamic shapes
  • High degree of elasticity. Like fish rod
A

Advantages of Composites

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6
Q

When a composite airplane structure fails. Will they completely fail?

A

Yes, because nature of these parts usually doesn’t exhibit any signs of impending failure. (eg - cracks)

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7
Q

Common reason that weaken composite structures?

A

Moisture from (Water, oil, fuel etc)

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8
Q

Composites are very expensive eh?

A

Yeaaaa

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9
Q

Type of fiberglass from magnesia-alumina and is used where a very high tensile strength needed.

A

S-glass

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10
Q

______ Most commonly known as Kevlar. Manufactured by Dupont company.

Exceptional flexibility, Non-conductive, and does not react with metals.

A

Aramid

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11
Q

____/____ fibers are produce through a heating process of organic fibers in an inert atmosphere.

A

Carbon/Graphite

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12
Q

Carbon fibers are produced at a temperature of approximately ______ and are approximately 93% - 95% carb

A

2400° F

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13
Q

Graphite fibers are produced at a temperature of approximately ______ to ______ and are more than 99% carbon

A

3450°F to 5450°F

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14
Q

Carbon/Graphite composites will produce corrosion when bonded to _____?

A

aluminum or steel

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15
Q

What does technicians use to separate carbon/graphite from metallic structures?

A

sealants and corrosion barriers

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16
Q

Fiber style that only used for military applications and extremely expensive.

Very toxic to human health.

A

Boron

17
Q

Fiber style that is a synthetic that is exposed to very high heat approximately 2200° F.

Produces very high temperature resistant walls. (Eg. combustion chamber)

A

Ceramics

18
Q

For any kind of composite structure, the greatest strength can be attained by having of the fibers _______.

A

aligned in one direction

19
Q

_______ fibers are ones in which all of the major fibers run in one direction, and provide maximum strength in only that direction.

A

Unidirectional fibers

20
Q

_____ fabrics are fabrics where the major fibers are woven so that they run in two (2) or more directions

considered as WOVEN FABRICS

warp and fill are equal and can use different materials

A

Bi-directional / Multi-directional

21
Q

Interface.

A

1um (micrometer) = 1millionth of a meter

1/1000 or 0.001

22
Q

1) Fiberglass. (E-Glass and S-Glass)
2) Aramid (Kevlar)
3) Carbon Fiber (Manufactured at 2400°F)
4) Graphite Fiber (Manufactured between 3450°F – 5480°F)
5) Boron Fibers (Core filament of W)
6) Ceramics (Able to withstand High Temperature

A

Reinforcing Fabric types

23
Q

fabrics are woven on a large machine called a ______.

A

Fabric Loom

24
Q

Plain weave example:

A

to be uploaded

25
Q

________ are fabrics that consist of chopped fibers that are compressed together.

Not designed to take high stress loads.

It build up the size of a composite construction

A

Mat fabrics

26
Q

mat fabric picture

A

to be uploaded

27
Q

2 general categories of matrix:

A

Thermoplastic and Thermosetting

28
Q

Very early thermosetting matrix formulation. It is a 2 part compound where there is a resin and a catalyst.

Exothermic reaction happens when 2 materials are mixed. Substance becomes HARD.

A

Polyester Resin

29
Q

Biggest drawback for polyester resin:

A

Fucking dangerous

it SHRINKS and lack of structural rigidity

highly flammable and toxic

30
Q

They consist of a two part system. One part being the resin and the other being the catalyst.

They have outstanding adhesive, strength and moisture resisting qualities.

_______ are very good at bonding dissimilar materials such as metal parts with composite parts.

A

Thermosetting epoxy resins

Materials (7 decks)

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