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

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Presentation transcript:

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

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

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

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

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

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

Materials selection - aesthetics

Materials selection - properties

Materials selection - properties

Materials selection - properties

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

Materials selection - properties 500 MPa

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

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

Assignment: Review today's classnotes a. selection considerations b. use of Ashby charts Read pp. 144-151

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