Composites - overview Artificial combination of matrix phase & dispersed phase Artificial...
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Composites - overview Composites - overview
Artificial combination of matrix phase & dispersed phase Artificial combination of matrix phase & dispersed phase
Matrix:metal, alloyceramic mat'lpolymer
Matrix:metal, alloyceramic mat'lpolymer
Dispersed phase:particulatefiber
Dispersed phase:particulatefiber
Composites - metal matrix composites (MMCs) Composites - metal matrix composites (MMCs)
Particulates:ThO2-dispersed Ni (TD Ni)sintered Al powder (SAP)
Particulates:ThO2-dispersed Ni (TD Ni)sintered Al powder (SAP)
- except strengthening maintained at hi T- except strengthening maintained at hi T
Improves:strengthcreep resistancehi T corrosion resistance
Improves:strengthcreep resistancehi T corrosion resistance
Works like precipitation hardeningWorks like precipitation hardening
Composites - metal matrix composites (MMCs) Composites - metal matrix composites (MMCs)
Fibers:Conts - C, SiC, B, Al2O3
Disconts - C, Al2O3 , SiC whiskers
Fibers:Conts - C, SiC, B, Al2O3
Disconts - C, Al2O3 , SiC whiskers
May get rxn betwn phases at hi TMay get rxn betwn phases at hi T
Matrix mat'lsMatrix mat'ls
Composites - ceramic matrix composites (CMCs) Composites - ceramic matrix composites (CMCs)
Particulates, fibers:SiC, B, Al2O3 , C, SiC & Si3N4
whiskers
Particulates, fibers:SiC, B, Al2O3 , C, SiC & Si3N4
whiskers
Improve fracture toughness:Improve fracture toughness:
slow crack growthdeflect crack tipsredistribute stresses around crack
tipsbridge crack tips
slow crack growthdeflect crack tipsredistribute stresses around crack
tipsbridge crack tips
MatrixMatrix
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
CompositesComposites
Fibers - variablesamountfiber lengthdistributionorientation
Fibers - variablesamountfiber lengthdistributionorientation
Fiber orientation can berandom aligned intermediate
Fiber orientation can berandom aligned intermediate
Crystal whiskers - SiC Crystal whiskers - SiC
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Fibers:mainly - glass (GFRPs), carbon (CFRPs),
aramid,others - B, SiC, Al2O3
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Carbon fibers frequently used as woven fabrics impregnated with an epoxyCarbon fibers frequently used as woven fabrics impregnated with an epoxy
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Woven carbon fiber fabrics in auto industry -Woven carbon fiber fabrics in auto industry -
2006 BMW M6 - roof (unpainted)2006 BMW M6 - roof (unpainted)
'vette Z06 - front fenders, wheel wells, floor'vette Z06 - front fenders, wheel wells, floorPorsche Carrera GT ($440,000) - framePorsche Carrera GT ($440,000) - frame
Scion accessories - gear shift knob ($49), fuel-filler door ($39), roof pillar appliqués ($75-189), etc.
Scion accessories - gear shift knob ($49), fuel-filler door ($39), roof pillar appliqués ($75-189), etc.
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs) MatrixMatrix
Composites - polymer matrix composites (PMCs) Composites - polymer matrix composites (PMCs)
Very common - polyesters, vinyl estersVery common - polyesters, vinyl esters
CompositesComposites
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
Matrix/fiber bond:matrix must wet fiber physical & chemical bond desirablemechanical interlocking
Matrix/fiber bond:matrix must wet fiber physical & chemical bond desirablemechanical interlocking
Fibers frequently coated w/ coupling agentFibers frequently coated w/ coupling agent
non-couplednon-coupled
CompositesComposites
coupledcoupled
CompositesComposites
Fibers - variablesamountfiber lengthdistributionorientation
Fibers - variablesamountfiber lengthdistributionorientation
CompositesComposites
Fibers - variablesamountfiber lengthdistributionorientation
Fibers - variablesamountfiber lengthdistributionorientation
Fiber orientation can berandom aligned intermediate
Fiber orientation can berandom aligned intermediate
CompositesComposites
CompositesComposites