1. Composites - polymer matrix composites (PMCs)

2. Composites - polymer matrix composites (PMCs)
Very common - polyesters, vinyl esters

3. Composites
Role of matrix in FR composites:
a. transfer stresses betwn fibers
b. provide barrier to environment
c. protect fibers
Matrix/fiber bond:
matrix must wet fiber
physical & chemical bond desirable
mechanical interlocking
Fibers frequently coated w/ coupling agent

4. Composites
non-coupled
coupled

5. Composites
Fibers - variables
amount
fiber length
distribution
orientation

6. Composites
Fibers - variables
amount
fiber length
distribution
orientation
Fiber orientation can be
random
aligned
intermediate

7. Composites

8. Composites

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

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

11. 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

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

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

14. Materials selection - aesthetics

15. Materials selection - properties

16. Materials selection - properties

17. Materials selection - properties

18. Materials selection - properties
500 MPa

19. Materials selection - properties
500 MPa