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General Engineering Materials > Composites > Flashcards

Composites Flashcards

1
Q

What is work hardening?

A

Is the strengthening of a metal by plastic deformation. This strengthening occurs because of DISLOCATION movements and dislocation generation within the crystal structure of the material.

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2
Q

What is plastic deformation?

A

Is a process in which permanent deformation is caused by a sufficient load. It produces a permanent change in the shape or size of a solid body without fracture, resulting from the application of sustained stress beyond the elastic limit.

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3
Q

What are ferrous metals?

A

All ferrous metals are magnetic and give little resistance to corrosion. Eg. Cast Iron

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4
Q

What are non-ferrous metals?

A

These are metals which do not contain any iron. They are not magnetic and are usually more resistant to corrosion than ferrous metals. Eg. aluminium, copper, lead.

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5
Q

What are the three different types of Polymers?

A

Thermoplastic
Thermoset
Elastomer

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6
Q

How can you make a metal stronger?

A

Alloying
Mechanical Treatment
Heat Treatment

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7
Q

Do most metals retain useful ductility?

A

Yes, even high strength alloys

Especially pure metals, are highly ductile

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8
Q

How does corrosion effect metals?

A

Metals are the least resistant to corrosions

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9
Q

Do metals have a high electrical and thermal conductivity?

A

Yes

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10
Q

Are ceramics and glasses brittle?

A

Yes

Compression is 15 times strength of tension

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11
Q

What is ductility?

A

Ductility is a solid material’s ability to deform under tensile stress; this is often characterised by the material’s ability to be stretched into a wire.

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12
Q

Do ceramics and glasses have high ductility?

A

They have a very low (Zero) ductility

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13
Q

Are ceramics and glasses abrasion (scratching & wearing) resistant?

A

Yes

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14
Q

Are ceramics and glasses corrosion resistant?

A

Yes

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15
Q

Do Polymers and Elastomers properties depend on temperature?

A

Yes. Eg. Polymer which is tough and flexible at 20 degrees can be :
brittle at 4 degrees
creeps rapidly at 100 degrees (deformation)

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16
Q

Are Polymers and Elastomers easy to shape and colour?

A

Yes

17
Q

Do you usually need to finishing operations for Polymers and Elastomers?

A

No

18
Q

Are Polymers and Elastomers corrosion resistant?

A

Yes

19
Q

What are Composites?

A

Composites are two or more materials with markedly different physical or chemical properties combined in a way that they act in concert, yet remain separate and distinct at some level because they don’t fully merge or dissolve into one another.

Eg. Concrete

20
Q

What are Composites main characteristics?

A 
They can be:
Light
Stiff
Strong
Tough
21
Q

What is Stiffness?

A

Resistance to elastic deformation

Young’s Modulus, Shear Modulus, Bulk Modulus

22
Q

What is Strength?

A

Resistance to plastic flow

Yield Strength, Ultimate tensile strength

23
Q

What is Toughness?

A

Resistance to fracture?

Fracture toughness

24
Q

What are the fundamental properties?

A

Density
Stiffness
Strength
Toughness

25
Q

What are the secondary properties?

A

Temp capability
Formability
Fatigue resistance (crack initiation and growth)
Cost

26
Q

What are the material requirements for a good reinforcement?

A

Three Characteristics

  1. High Stiffness and Strength
  2. Good shape & surface character for effective mechanical coupling to the matrix
  3. Does not change the properties of the matrix
27
Q

Why use Fibre particles for reinforcement?

Aspect Ratio Specifics:

A

If Aspect Ratio&raquo_space; 1 :

Fibres offer better performance if high stiffness and strength are required in a particular direction

28
Q

Why use Nanoplatelets for reinforcement?

Aspect Ratio Specifics:

A

If Aspect Ratio

29
Q

What is the Aspect Ratio?

A

a = length / diameter

30
Q

What is the measure of reinforcement efficiency?

A

Area / Volume

General Engineering Materials (1 decks)

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