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Flashcards in MEC119 Deck (10)
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1

Define constraints

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

2

Define objectives

The optimisation
E.g. cheapest, minimise embodied energy

3

Define free variables

What you can change to meet your objective
E.g. changing material

4

What are hybrid materials?

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

5

What are the types of hybrids?

Composites
Sandwich structures
Lattices
Segmented

6

Describe a composite material

Particles or fibres of one material are embedded in another

7

Describe the sandwich structure

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

8

Which materials have a lattice structure?

Foams and other highly porous materials

9

Describe the segmented hybrid structure

Materials are made of interlocking strands or layers of materials

10

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

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

f = volume fraction of reinforcement
P_r = density of reinforcement
P_m = density of matrix