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


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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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 – Feyman' - bruno-johnston


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Composites - polymer matrix composites (PMCs) see there

Fibers:

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

others - B, SiC, Al2O3


Composites - polymer matrix composites (PMCs) see there

Fibers:

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

others - B, SiC, Al2O3


Composites - polymer matrix composites (PMCs) see there

Fibers:

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

others - B, SiC, Al2O3


Composites - polymer matrix composites (PMCs) see there

Fibers:

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

others - B, SiC, Al2O3


Composites - polymer matrix composites (PMCs) see there

Fibers:

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

others - B, SiC, Al2O3


Composites - polymer matrix composites (PMCs) see there

Carbon fibers frequently used as woven fabrics impregnated with an epoxy



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.



Composites - polymer matrix composites (PMCs) see there

Very common - polyesters, vinyl esters


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


non-coupled see there

coupled

Composites


Composites see there

Fibers - variables

amount

fiber length

distribution

orientation


Composites see there

Fibers - variables

amount

fiber length

distribution

orientation

Fiber orientation can be

random

aligned

intermediate


Composites see there


Composites see there


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


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


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