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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, Al 2 O 3. Composites - polymer matrix composites (PMCs).

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

Composites - polymer matrix composites (PMCs) see there

Fibers:

mainly - glass (GFRPs), carbon (CFRPs), aramid,

others - B, SiC, Al2O3


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

Composites - polymer matrix composites (PMCs) see there

Fibers:

mainly - glass (GFRPs), carbon (CFRPs), aramid,

others - B, SiC, Al2O3


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

Composites - polymer matrix composites (PMCs) see there

Fibers:

mainly - glass (GFRPs), carbon (CFRPs), aramid,

others - B, SiC, Al2O3


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

Composites - polymer matrix composites (PMCs) see there

Fibers:

mainly - glass (GFRPs), carbon (CFRPs), aramid,

others - B, SiC, Al2O3


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

Composites - polymer matrix composites (PMCs) see there

Fibers:

mainly - glass (GFRPs), carbon (CFRPs), aramid,

others - B, SiC, Al2O3


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

Composites - polymer matrix composites (PMCs) see there

Carbon fibers frequently used as woven fabrics impregnated with an epoxy



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

Composites - polymer matrix composites (PMCs) see there

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.



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

Composites - polymer matrix composites (PMCs) see there

Very common - polyesters, vinyl esters


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

Composites see there

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


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

non-coupled see there

coupled

Composites


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

Composites see there

Fibers - variables

amount

fiber length

distribution

orientation


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

Composites see there

Fibers - variables

amount

fiber length

distribution

orientation

Fiber orientation can be

random

aligned

intermediate


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

Composites see there


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

Composites see there


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

Assignment: see there

Review today's classnotes

a. PMCs - fibers

b. vinyl esters

c. matrix/fiber bond

d. fiber characteristics & behavior

Read pp. 538-563


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

Composites - polymer matrix composites (PMCs) see there

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