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GP1 > Selection and Production of Materials > Flashcards

Selection and Production of Materials Flashcards

1
Q

Name there 4 families of engineering materials.

A

Metals
Ceramics
Glasses
Polymers & elastomers

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2
Q

6 types of materials properties

A 
General
Mechanical
Thermal
Electrical
Magnetic
Optical
Environmental/Chemical
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3
Q

Effect of bonding on yield strength

A

Increasing directionality of bonding leads to increased yield strength and hardness.

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4
Q

What are engineering materials a function of (2 things)?

A

Raw materials

Processing history

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5
Q

Outline the design process

A

Pick application
Determine the required properties
Identify candidate materials
Identify required processing

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6
Q

Four steps for materials selection.

A

TRANSLATION of design requirements
SCREENING using constraints
RANKING using the objective
SUPPORTING INFORMATION

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7
Q

Four parts of TRANSLATION

A

Function
Objective
Constraints
Free variables

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8
Q

A performance equation is made of functions that represent what 3 things?

A

Functional requirements, geometry and material properties

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9
Q

How do you identify a material when there are multiple constraints?

A

Solve each constraint individually
Select candidates based on each constraint
Evaluate performance using each constraint
Select performance based on the most limiting.

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10
Q

What is a composite?

A

A reinforced matrix usually to modify mechanical properties of a material.

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11
Q

Common themes of composites.

A

Multiple phases present
Interfaces between phases
Need to control structure and anisotropy of the phases - processing challenges
Multiple length scales

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12
Q

Three main types of polymers.

A

PMCs
CMCs
MMCs

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13
Q

Examples of PMCs

A

CF/poxy (prosthetics)
Powdered ferrite and rubber (fridge magnets)
PZT in thermoplastic (piezoelectric transducers)

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14
Q

Benefits of thermoplastic PMCs

A

Cheapest processing

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15
Q

Benefits of elastomer PMCs

A

Elastomeric mechanical properties

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16
Q

Benefits of thermosetting PMCs

A

Stiff
Higher T resistance
Low viscocity precursor

17
Q

Ceramic fibres/parrticles in MMCs improve what properties?

A

High T strength
Creep resistance
Wear resistance
Can tailor thermal expansion

18
Q

Which metals are the usual matrices in MMCs?

A

Al, Mg or Ti

19
Q

Applications of MMCs

A

Engine pistons (Al + Al2O3)
Aeroengine fan blades (Ti + SiC monofilament)
Brake discs (Al-Si + SiC particulate)
Conducting cable core (Al + Al2O3)

20
Q

What is a cermet?

A

Typically ceramic with possiblity of plastic deformation. Ususally <20% metal by volume.

21
Q

CMC examples

A

Concrete/reinforced concrete
Zirconia toughened alumina grinding balls
Hypersonic aeroshells (C/SiC, C/C, SiC/SiC)
Brake discs (CF reinforced SiC)

22
Q

What is a 0.5D fibre?

A

Chopped fibre in composite.

23
Q

Examples of linear composites.

A

Plywood
Insulation panel
CF weave

24
Q

Write the full stacking sequence of this:

A

[(±45/(0)2/(90)2)2]s

25
Q

Derive the max fibre packing ration in particulate composite and a fibre matrix.

A

Check

26
Q

Volume fraction of fibres in hexagonal and square lattice eqns.

A

Check

27
Q

Seperation of fibres in hexagonal and square lattice equations

A

Check

28
Q

What is E-glass?

A

Electrical, good insulator and strength

29
Q

What is C-glass?

A

Corrosion resistance

30
Q

What is S glass?

A

Higher cost that E, higher strength and high T properties.

31
Q

Examples of heirarchical structures.

A

Wood, bone

32
Q

What is a metamaterial?

A

A material manufactured with repeating hierarchical structures.

33
Q

What are the five different types of interface bonding mechanisms?

A 
Interdiffusion & chemical reaction
Electrostatic attraction
Residual stress
Mechanical keying
Adsorption & wetting

GP1 (3 decks)

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