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Do not read so much, look about you and think of what you see there 
 – Feyman

Explore the different fibers used in polymer matrix composites (PMCs) such as glass, carbon, aramid, and others, and understand the role of the matrix in these composites. Learn about fiber characteristics, bonding with the matrix, and the behavior of PMCs in terms of crack growth and stress redistribution.

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Do not read so much, look about you and think of what you see there 
 – Feyman

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  1. Do not read so much, look about you and think of what you see there 
 – Feyman

  2. Crystal whiskers - SiC

  3. Composites - polymer matrix composites (PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3

  4. Composites - polymer matrix composites (PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3

  5. Composites - polymer matrix composites (PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3

  6. Composites - polymer matrix composites (PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3

  7. Composites - polymer matrix composites (PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3

  8. Composites - polymer matrix composites (PMCs) Carbon fibers frequently used as woven fabrics impregnated with an epoxy

  9. Composites - polymer matrix composites (PMCs)

  10. Composites - polymer matrix composites (PMCs) Woven carbon fiber fabrics in auto industry - 2006 BMW M6 - roof (unpainted) 'vette Z06 - front fenders, wheel wells, floor Porsche Carrera GT ($440,000) - frame Scion accessories - gear shift knob ($49), fuel-filler door ($39), roof pillar appliqués ($75-189), etc.

  11. Composites - polymer matrix composites (PMCs) Matrix

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

  13. 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

  14. non-coupled coupled Composites

  15. Composites Fibers - variables amount fiber length distribution orientation

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

  17. Composites

  18. Composites

  19. Assignment: Review today's classnotes a. PMCs - fibers b. vinyl esters c. matrix/fiber bond d. fiber characteristics & behavior Read pp. 538-563

  20. Composites - polymer matrix composites (PMCs) Role of matrix in FR composites: a. transfer stresses betwn fibers b. provide barrier to environment c. protect fibers Slow crack growth deflect crack tips redistribute stresses around crack tips bridge crack tips

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