Composites - polymer matrix composites (PMCs)

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Presentation transcript:

Composites - polymer matrix composites (PMCs)

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

Materials selection - some considerations Economics Environmental Political Market Aesthetics Material properties

Materials selection - material cost Relative cost - compared to that of hot rolled ASTM A36 plate (0.29C-1Mn-0.28Si) (unit wt. basis)

Materials selection - environmental Health hazards Recycling when drawing SS to rod need lubricant Metals particularly suited to recycling - can be easily sorted, remelted, & shaped Ceramics usually not recycled - many polymers are Composites difficult to recycle - difficult to separate fibers from matrix

Materials selection - political Who writes the specs for contract bids? Will they specify stainless steel rebar in roads & bridges?

Materials selection - market Carrera GT vs …… Kia vs ……

Materials selection - aesthetics

Materials selection - properties

Materials selection - properties

Materials selection - properties

Materials selection - properties 500 MPa

Materials selection - properties 500 MPa