1. A great many people think they are thinking when they are merely rearranging their prejudices 
 – William James

2. Materials selection - some considerations
Economics
Environmental
Political
Market
Aesthetics
Material properties

3. Materials selection - material cost
Relative cost - compared to that of hot rolled ASTM A36 plate (0.29C-1Mn-0.28Si)
(unit wt. basis)

4. Materials selection - environmental
Health hazards
Recycling
when drawing SS to rod
need lubricant
Metals particularly suited to recycling - can be easily sorted, remelted, & shaped
Ceramics usually not recycled - many polymers are
Composites difficult to recycle - difficult to separate fibers from matrix

5. Materials selection - political
Who writes the specs for contract bids?
Will they specify stainless steel rebar in roads & bridges?

6. Materials selection - market
Carrera GT vs ……
Kia
vs ……

7. Materials selection - aesthetics

8. Materials selection - properties

9. Materials selection - properties

10. Materials selection - properties

11. Materials selection - properties
500 MPa
log sf = log r + log P

12. Materials selection - properties
500 MPa

13. Know these functional groups:
acid, alcohol, amine, amide, epoxide, carbonate, ester

14. Be able to recognize and differentiate between these polymer structures:
polyethylene, polypropylene, nylon, Kevlar, PVC, silicone, polycarbonate, Bakelite

15. Assignment:
Review today's classnotes
a. selection considerations
b. use of Ashby charts
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