No problem is too small or too trivial

No problem is too small or too trivial

No problem is too small or too trivial if we can really do something about it Feyman H H2C-C-C{-OO H epoxy

Prepregs H H-C-H -CH-C-H H H -O-}nC-C-CH2 H O H2N-R-NH2

hardener Some specific polymers Composites - overview Example - carbide tools (previously discussed)

Co matrix phase angular WC fragments Composites - overview Artificial combination of matrix phase & dispersed phase Matrix:

metal, alloy ceramic mat'l polymer Dispersed phase: particulate fiber Composites - metal matrix composites (MMCs) Particulates: ThO2-dispersed Ni (TD Ni)

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

Fibers: Conts - C, SiC, B, Al2O3 Disconts - C, Al2O3 , SiC whiskers Matrix mat'ls May get rxn betwn phases at hi T Composites - ceramic matrix composites (CMCs) Particulates, fibers: SiC, B, Al2O3 , C, SiC & Si3N4

whiskers Matrix Improve fracture toughness: slow crack growth deflect crack tips redistribute stresses around crack tips bridge crack tips Composites - polymer matrix composites

(PMCs) Fibers: mainly - glass (GFRPs), carbon (CFRPs), aramid, others - B, SiC, Al2O3 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 Fiber orientation can be random aligned intermediate

Assignment: Review today's classnotes a. epoxies b. composites - matrix, dispersed phase c. MMCs - strengthening mechanism d. CMCs - fracture toughness improves e. PMCs - fibers f. matrix/fiber bond Read pp. 481-507, 527-538

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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