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Composites - overview

Learn about composite materials, including their types such as metal matrix composites (MMCs), ceramic matrix composites (CMCs), and polymer matrix composites (PMCs). Explore the role of matrix phases and fibers in enhancing properties like strength and toughness.

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Composites - overview

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  1. Composites - overview Artificial combination of matrix phase & dispersed phase Matrix: metal, alloy ceramic mat'l polymer Dispersed phase: particulate fiber

  2. Works like precipitation hardening Composites - metal matrix composites (MMCs) Particulates: ThO2-dispersed Ni (TD Ni) sintered Al powder (SAP) - except strengthening maintained at hi T Improves: strength creep resistance hi T corrosion resistance

  3. Matrix mat'ls Composites - metal matrix composites (MMCs) Fibers: Conts - C, SiC, B, Al2O3 Disconts - C, Al2O3 , SiC whiskers May get rxn betwn phases at hi T

  4. Matrix Composites - ceramic matrix composites (CMCs) Particulates, fibers: SiC, B, Al2O3 , C, SiC & Si3N4 whiskers Improve fracture toughness: slow crack growth deflect crack tips redistribute stresses around crack tips bridge crack tips

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

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

  7. Crystal whiskers - SiC

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

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

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

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

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

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

  14. Composites - polymer matrix composites (PMCs)

  15. 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.

  16. Composites - polymer matrix composites (PMCs) Matrix

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

  18. 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

  19. non-coupled coupled Composites

  20. Composites Fibers - variables amount fiber length distribution orientation

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

  22. Composites

  23. Composites

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