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Materials selection - some considerations

Understanding the factors influencing materials selection - cost, environmental impact, political considerations, aesthetics, and properties like strength and recyclability. Learn key functional groups and polymer structures for informed decisions. Class assignment review included.

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Materials selection - some considerations

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  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. when drawing SS to rod need lubricant Materials selection - environmental Health hazards Recycling 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. vs …… Materials selection - market Carrera GT vs …… Kia

  7. Materials selection - aesthetics

  8. Materials selection - properties

  9. Materials selection - properties

  10. Materials selection - properties

  11. 500 MPa P=50 Materials selection - properties log sf = log r + log P

  12. 500 MPa Materials selection - properties

  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 Read pp. 144-151

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