Do not read so much, look about you

Do not read so much, look about you

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

Crystal whiskers - SiC Composites - polymer matrix composites (PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid,

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

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

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

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

others - B, SiC, Al2O3 Composites - polymer matrix composites (PMCs) Carbon fibers frequently used as woven fabrics impregnated with an epoxy

Composites - polymer matrix composites (PMCs) 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 appliqus ($75-189), etc.

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

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

Composites non-coupled coupled Composites Fibers - variables

amount fiber length distribution orientation Composites Fibers - variables

amount fiber length distribution orientation Fiber orientation can be random

aligned intermediate Composites Composites

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

Read pp. 538-563 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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