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

CompositesComposites

Fibers - variablesamountfiber lengthdistributionorientation

Fibers - variablesamountfiber lengthdistributionorientation

CompositesComposites

CompositesComposites

Fibers - variablesamountfiber lengthdistributionorientation

Fibers - variablesamountfiber lengthdistributionorientation

Fiber orientation can berandom aligned intermediate

Fiber orientation can berandom aligned intermediate

CompositesComposites

Materials selection - some considerationsMaterials selection - some considerations

EconomicsEnvironmentalPoliticalMarketAestheticsMaterial properties

EconomicsEnvironmentalPoliticalMarketAestheticsMaterial properties

Materials selection - material costMaterials 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 - environmentalMaterials selection - environmental

Health hazardsRecyclingHealth hazardsRecycling

Metals particularly suited to recycling - can be easily sorted, remelted, & shaped

Metals particularly suited to recycling - can be easily sorted, remelted, & shaped

Ceramics usually not recycled - many polymers are

Ceramics usually not recycled - many polymers areComposites difficult to recycle - difficult to separate fibers from matrix

Composites difficult to recycle - difficult to separate fibers from matrix

when drawing SS to rod

need lubricant

Materials selection - politicalMaterials 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?

Materials selection - marketMaterials selection - market

Carrera GT vs ……Carrera GT vs ……KiaKia

vs ……vs ……

Materials selection - aestheticsMaterials selection - aesthetics

Materials selection - propertiesMaterials selection - properties

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

Materials selection - propertiesMaterials selection - properties

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

Materials selection - propertiesMaterials selection - properties

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (LZW) decompressor

are needed to see this picture.

Materials selection - propertiesMaterials selection - properties

P=50

500 MPa

Materials selection - propertiesMaterials selection - properties

500 MPa

Assignment:

Review today's classnotes

a. fiber characteristics & behavior

b. selection considerationsc. use of Ashby charts

Read pp. 144-151

Assignment:

Review today's classnotes

a. fiber characteristics & behavior

b. selection considerationsc. use of Ashby charts

Read pp. 144-151

Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)

Role of matrix in FR composites:a. transfer stresses betwn fibersb. provide barrier to environmentc. protect fibers

Role of matrix in FR composites:a. transfer stresses betwn fibersb. provide barrier to environmentc. protect fibers

Slow crack growthdeflect crack tipsredistribute stresses around crack

tipsbridge crack tips

Slow crack growthdeflect crack tipsredistribute stresses around crack

tipsbridge crack tips

A great many people think they are thinking when they are merely rearranging their

prejudices. (William James)