A great teacher never strives to explain his vision. He simply invites you to stand beside him and see for yourself. – R. Inman A great teacher never strives.

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Presentation transcript:

A great teacher never strives to explain his vision. He simply invites you to stand beside him and see for yourself. – R. Inman A great teacher never strives to explain his vision. He simply invites you to stand beside him and see for yourself. – R. Inman

Composites Fibers - variables amount fiber length distribution orientation Fibers - variables amount fiber length distribution orientation

Composites

Fibers - variables amount fiber length distribution orientation Fibers - variables amount fiber length distribution orientation Fiber orientation can be random aligned intermediate Fiber orientation can be random aligned intermediate

Composites

Materials selection - some considerations Economics Environmental Political Market Aesthetics Material properties 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) 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 Health hazards Recycling 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 when drawing SS to rod need lubricant

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

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Materials selection - aesthetics

Materials selection - properties

P= MPa

Materials selection - properties 500 MPa

Assignment: Review today's classnotes a. fiber characteristics & behavior b. selection considerations c. use of Ashby charts Read pp Assignment: Review today's classnotes a. fiber characteristics & behavior b. selection considerations c. use of Ashby charts Read pp

Composites - polymer matrix composites (PMCs) Role of matrix in FR composites: a. transfer stresses betwn fibers b. provide barrier to environment c. protect fibers 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 Slow crack growth deflect crack tips redistribute stresses around crack tips bridge crack tips A great many people think they are thinking when they are merely rearranging their prejudices. (William James)William James