MEC119 Flashcards
(10 cards)
Define constraints
What must be satisfied
E.g. must be able to support a certain load
Define objectives
The optimisation
E.g. cheapest, minimise embodied energy
Define free variables
What you can change to meet your objective
E.g. changing material
What are hybrid materials?
Two or more materials with very different properties combined together to form a hybrid material
What are the types of hybrids?
Composites
Sandwich structures
Lattices
Segmented
Describe a composite material
Particles or fibres of one material are embedded in another
Describe the sandwich structure
Skins of high-performance material on a lower-grade core
Which materials have a lattice structure?
Foams and other highly porous materials
Describe the segmented hybrid structure
Materials are made of interlocking strands or layers of materials
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