MEC119 Flashcards

(10 cards)

1
Q

Define constraints

A

What must be satisfied

E.g. must be able to support a certain load

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Define objectives

A

The optimisation

E.g. cheapest, minimise embodied energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define free variables

A

What you can change to meet your objective

E.g. changing material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are hybrid materials?

A

Two or more materials with very different properties combined together to form a hybrid material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the types of hybrids?

A

Composites
Sandwich structures
Lattices
Segmented

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Describe a composite material

A

Particles or fibres of one material are embedded in another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe the sandwich structure

A

Skins of high-performance material on a lower-grade core

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Which materials have a lattice structure?

A

Foams and other highly porous materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Describe the segmented hybrid structure

A

Materials are made of interlocking strands or layers of materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What’s the equation for the density of a composite?

A

P_c = f*P_r + (1-f)P_m

f = volume fraction of reinforcement
P_r = density of reinforcement
P_m = density of matrix
How well did you know this?
1
Not at all
2
3
4
5
Perfectly