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Engineering Materials > Properties > Flashcards

Properties Flashcards

1
Q

List three form properties.

A

Shape
Surface
Size

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2
Q

List five mechanical properties.

A

Fracture
Toughness
Yield strength
Tensile strength
Elastic modulus

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3
Q

List three chemical properties.

A

Reactivity
Toxicity
Corrosion

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4
Q

List three thermal properties.

A

SHC
Thermal expansion
Conductivity

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5
Q

List two electrical properties.

A

Conductivity
Resistance

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6
Q

List three optical properties.

A

Refract
Reflect
Absorb

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7
Q

List three environmental properties.

A

Sustainability
Recyclable
Biodegradable

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8
Q

List three characteristics of metals.

A

High thermal conductivity
Ductile
Corrodes easily

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9
Q

List three characteristics of polymers.

A

Ductile
Corrosion resistant
Non-reactive

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10
Q

List three characteristics of ceramics.

A

Brittle
Corrosion resistant
Recyclable

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11
Q

List three characteristics of hybrid / composites.

A

High yield strength
Low density
Corrosion resistant

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12
Q

What is the difference between yield strength and tensile strength?

A

YS is the maximum stress before permanent deformation.

TS is the point of fracture.

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13
Q

List three properties of metallic materials.

A

Conductors
Ductile
Opaque

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14
Q

List four properties of covalent materials.

A

Soft
Brittle
Insulators
Low melting point

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15
Q

List three properties of ionic materials.

A

Hard
Insulator
Brittle
High melting points

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16
Q

Define ductility.

A

Ability of a material to deform under tensile load.

17
Q

Define malleability.

A

Ability of material to deform under compressive load.

18
Q

Name four material properties that are determined by the atomic structure.

A

Electric conductivity
Opacity
Thermal conductivity
YM

19
Q

Why are ceramics poor conductors of heat?

A

Ceramics have ionic and covalent bonds which has no free electrons.

Free valence electrons (such as in metallic bonds) are required for good conductivity of heat.

20
Q

Which class of materials is best for reactors and why?

A

Metals

High ductility and tensile strength.

21
Q

What is the difference between metals and metallic glass?

A

Metals have a crystalline structure.

Metallic glass has an amorphous structure.

22
Q

Difference between metals and polymers on a stress-strain graph?

A

Polymers have less toughness compared to metals.

Smaller area under the graph.

23
Q

Why are polymers poor conductors or heat and electricity?

A

Polymers have covalent bonds which has no free electrons.

Free valence electrons (such as in metallic bonds) are required for good conductivity of heat.

24
Q

Define brittle.

A

A material that does not undergo plastic deformation but instead fractures.

25
Q

What arrangements can a solid material exist in?

A

Crystalline, semi crystalline or amorphous.

26
Q

List three material properties to consider when designing a heat exchanger.

A

Yield strength
Thermal conductivity
Thermal expansion

27
Q

What class of materials has a low fracture toughness?

A

Ceramics

28
Q

What is the name for ordered atomic arrangements? Give one example.

A

Crystalline

Quartz

29
Q

What is the name for unordered atomic arrangements? Give one example.

A

Amorphous

Glass

30
Q

Describe a crystalline structure.

A

Short range and long range order in regular repeating units.

31
Q

Describe an amorphous structure.

A

No regular repeating structures.

32
Q

How many types of crystal structure arrangements are there?

A

14

33
Q

What are the three most common crystal structure arrangements?

A

BCC (body centred cubic)
FCC (face centred cubic)
HCP (hexagonal closest packed)

34
Q

Define thermal conductivity.

A

Ability of a material to conduct heat.

35
Q

Define yield strength.

A

The maximum stress a material can withstand before undergoing permanent deformation.

36
Q

Define tensile strength.

A

The stress at which a material fractures.

37
Q

What class of materials has the highest hardness?

A

Ceramics
Hardness depends on atomic bonding
Ceramics have strong ionic and covalent bond.

38
Q

What is the best class of materials for building a reactor operating at constant pressure and elevated temperatures?

A

Metals
High tensile strength and ductility

Engineering Materials (8 decks)

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