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Transcript of 1 EF 152 Materials Recitation February 3, 2009 Materials Science and Engineering Department.
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EF 152EF 152Materials RecitationMaterials Recitation
February 3, 2009February 3, 2009
Materials Science and Engineering Materials Science and Engineering DepartmentDepartment
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Materials RecitationMaterials Recitation
Space Elevator Material RequirementsSpace Elevator Material Requirements
Hot Wire & Shape Memory DemoHot Wire & Shape Memory Demo
Material ApplicationsMaterial Applications Heat SinkHeat Sink Biomimetic LensBiomimetic Lens SpaceShipOneSpaceShipOne
Affect of Heat Treatment DemoAffect of Heat Treatment Demo
MSE Dept. InformationMSE Dept. Information
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Space ElevatorSpace Elevator
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LifterLifter
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Space ElevatorSpace Elevator
rocket: $20,000/kg to orbitrocket: $20,000/kg to orbit
elevator: $200/kg to orbit elevator: $200/kg to orbit
elevator much saferelevator much safer no rocketsno rockets no re-entry heatno re-entry heat
~$10 billion to build elevator~$10 billion to build elevator NASA budget = $15 billion/yrNASA budget = $15 billion/yr $0.5 billion per shuttle launch$0.5 billion per shuttle launch
8 days one way8 days one way
material for cable?material for cable?
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Material requirements for cable?
strength
density
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Geostationary OrbitGeostationary Orbit
hr
secdayhr 600,324
2 R
Fg
v
R
m 42.24x10
360024
4
6
22
2
2
2
gravity
R
R
mmG
Rm
R
mmG
R
mv
Fma
E
E
n
Geostationary: satellite stays above same point on earth’s surface (geosynchronous)
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Force on CableForce on Cable
Cable must support weight of cable beneath itCable must support weight of cable beneath it
dRR
GMrdF cableg 2
2
112
R
64562
2
)m645.6()kg 246)(1167.6(
1)(
2
3
REEEr
dRR
GMrRF
skgm
E.
cableg
2
2
2
2
7E3.5
7E3.5
m, 42.24E6 Rat
2
2
sm
cablegcable
smcable
g
r
F
rF
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Material Requirement for CableMaterial Requirement for Cable
32
2
kg/mPa
sm 73.5735 EE.
ρ
σUTS
“Specific Strength”
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StrengthStrength
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DensityDensity
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Specific StrengthSpecific Strength
Material ρ (kg/m3) σUTS (MPa) σUTS/ρ (m2/s2)
7075 T6 Al 2,800 505 1.8E+05Ti-6Al-4V 4,430 1,172 2.6E+05440A Stainless steel 7,800 1,790 2.3E+05Nylon 6,6 1,140 90 7.9E+04Polyester 1,250 85 6.8E+04Kevlar 49 1,440 4,100 2.8E+06Spectra 2000 970 3,340 3.4E+06Silicon Carbide 3,200 825 2.6E+05Silicon Nitride 3,300 1,000 3.0E+05Diamond 3,400 1,400 4.1E+05C fiber 1,790 6,350 3.5E+06E-glass 2,580 3,450 1.3E+06
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Specific StrengthSpecific Strength
σ UTS/ρ
= 5.
3E7 m
2 /s2
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Carbon NanotubesCarbon Nanotubes
11stst produced in 1991 produced in 1991
C=C double bonds C=C double bonds stronger than diamond stronger than diamond
~ 1 nm in diameter~ 1 nm in diameter
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Carbon NanotubesCarbon Nanotubes
100 X stronger than diamond100 X stronger than diamond1/6 density of steel1/6 density of steelup to 500 X specific strength of steelup to 500 X specific strength of steelρρ = 1,300 kg/m = 1,300 kg/m33 highest measured strength = 63 GPahighest measured strength = 63 GPa 4.8E7 m4.8E7 m22/s/s22 90% of target90% of targettheoretical strength = 150 GPatheoretical strength = 150 GPa 11.4E7 m11.4E7 m22/s/s22 suitable for space elevator cablesuitable for space elevator cable
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Carbon Nanotubes ChallengesCarbon Nanotubes Challenges
CNTs are 4 cm long, 1 nm diameter CNTs are 4 cm long, 1 nm diameter
need 36,000 km long, 0.5 mm diameter cable need 36,000 km long, 0.5 mm diameter cable composites containing 50% CNTscomposites containing 50% CNTs
binding between CNTs and matrixbinding between CNTs and matrix
km long composite fibers (3% CNT) have been km long composite fibers (3% CNT) have been produced with 2 GPa strengthproduced with 2 GPa strength
twisted CNT yarntwisted CNT yarn
Cost, ~ $25,000 per kgCost, ~ $25,000 per kg
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Hot Wire & Shape Memory Hot Wire & Shape Memory DemonstrationsDemonstrations
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Thermal ManagementThermal Management
Heat generated by electronic devices must be Heat generated by electronic devices must be dissipated to improve reliability and prevent failure.dissipated to improve reliability and prevent failure.
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Thermal ManagementThermal Management
Heat Sink DesignHeat Sink Design
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Thermal ManagementThermal Management
Which has highest thermal conductivity?Which has highest thermal conductivity?
A.A. AluminumAluminum
B.B. DiamondDiamond
C.C. GoldGold
D.D. SilverSilver
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Thermal ManagementThermal Management
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Chemical Vapor Deposition (CVD)Chemical Vapor Deposition (CVD)
methane (CH4) is heated: CHmethane (CH4) is heated: CH44 C + 4H C + 4H
gaseous C can deposit on substrate as diamondgaseous C can deposit on substrate as diamond
Synthetic DiamondSynthetic Diamond
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ProblemsProblems
Difficult to produce large areas (cmDifficult to produce large areas (cm22))
Slow growth ratesSlow growth rates
CostCost
Synthetic DiamondSynthetic Diamond
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Lenses in NatureLenses in Nature
Hierarchical layered protein structuresHierarchical layered protein structures
Refractive index gradientsRefractive index gradients Enhance focusing powerEnhance focusing power
Correct aberrationsCorrect aberrations
Reduce number of components needed Reduce number of components needed
for optical systemfor optical system
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Traditional LensTraditional Lens
Focus is a result of geometry and refractionFocus is a result of geometry and refraction
Refractive index does not vary within lensRefractive index does not vary within lens
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Focusing by an index gradient aloneFocusing by an index gradient alone
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Multilayer Polymer Gradient Index (GRIN) LensMultilayer Polymer Gradient Index (GRIN) Lens(Case Western Reserve University*)(Case Western Reserve University*)
* funded by DARPA
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Multilayer FilmsMultilayer Films
10 splittings 10 splittings 2048 layers 2048 layers
50 50 μμm film m film 24 nm layers (must be < 50 nm for transmission) 24 nm layers (must be < 50 nm for transmission)
Polycarbonate (PC), n = 1.58Polycarbonate (PC), n = 1.58 CD, DVD substrates, eyeglasses, water bottlesCD, DVD substrates, eyeglasses, water bottles
Poly(methyl methacrylate) (PMMA), n = 1.49Poly(methyl methacrylate) (PMMA), n = 1.49 Plexiglass, latex paint, countertops, lenses, aircraft cockpitsPlexiglass, latex paint, countertops, lenses, aircraft cockpits
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Multilayer FilmsMultilayer Films
Refractive index of film corresponds to a thickness-weighted Refractive index of film corresponds to a thickness-weighted average of the indices of the component polymersaverage of the indices of the component polymers
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GRIN FilmGRIN Film
...
...
100/0 PMMA/PC, n = 1.490
0/100 PMMA/PC, n = 1.580
99/1 PMMA/PC, n = 1.491
98/2 PMMA/PC, n = 1.492
50/50 PMMA/PC, n = 1.535
2/98 PMMA/PC, n = 1.578
1/99 PMMA/PC, n = 1.579
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GRIN Lens FabricationGRIN Lens Fabrication
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X-PrizeX-Prize
US $10M prize for the first non-government organization to launch a reusable manned spacecraft into space twice within two weeks
SpaceShipOneSpaceShipOne, October 2004, October 2004
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X-PrizeX-Prize
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SpaceShipOne
produced by Scaled Composites, LLC.
designed by Burt Rutan
project funded at $20M by Paul Allen (Microsoft)
carried to 14 km by White Knight aircraft (afterburning twin turbojets)
hybrid rocket motor generates 88 kN thrust for 87 sec.
reached altitude of112 km
now on display at National Air and Space Museum
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WhiteKnightOne and SpaceShipOneWhiteKnightOne and SpaceShipOne
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SpaceShipTwo
produced by Scaled Composites & Virgin (Richard Branson)
2X size of SpaceShipOne
private spaceflight service starting 2009 or 2010
two pilots and six passengers
110 km target altitude
carried to 15 km by White Knight Two
$200,000 per flight
200 customers have pre-paid
passengers must pass 6-8 g centifruge test
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Materials
Carbon fiber composites have excellent strength to weight ratio (specific strength)
Glass and Kevlar fibers also used
High performance, toughened epoxy matrix
Carbon fiber panels sandwiched around honeycomb core
White Knight Two largest all-carbon-fiber aircraft ever built 140 ft wing spar is the longest single carbon
composite aviation component ever manufactured most fuel efficient airplane ever created
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Affect of Heat Affect of Heat TreatmentTreatmentBrassBrassTool SteelTool Steel
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Materials Science & EngineeringMaterials Science & Engineering
Structure
Processing PropertiesEngineering
Science Scienc
eMATERIALS DEVELOPMENT
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MSE at UTMSE at UT
Class Size ~ 10-15 per yearClass Size ~ 10-15 per year
Scholarships, ~ 75% receiving Scholarships, ~ 75% receiving scholarships from dept: $800 - $2600 scholarships from dept: $800 - $2600 per yearper year
28 Faculty 28 Faculty
~ $5 M in annual research funding~ $5 M in annual research funding
UG research, thesis or paidUG research, thesis or paid
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MSE ScholarshipsMSE Scholarships
FreshmanFreshman $800 - $1,200 per year$800 - $1,200 per year
SophomoreSophomore $1,200 - $1,600 per year$1,200 - $1,600 per year
JuniorJunior $1,600 - $2,100 per year$1,600 - $2,100 per year
SeniorSenior $2,100 - $2,600 per year$2,100 - $2,600 per year
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MSE CurriculumMSE Curriculum
FundamentalsFundamentals
ThermodynamicsThermodynamicsKinetics & Transport PhenomenaKinetics & Transport PhenomenaProcessingProcessingMechanical BehaviorMechanical BehaviorDiffusion & Phase TransformationsDiffusion & Phase TransformationsStructural CharacterizationStructural CharacterizationMaterials Lab (2 semesters)Materials Lab (2 semesters)
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MSE CurriculumMSE Curriculum
Material ClassesMaterial Classes
PolymersPolymers
CeramicsCeramics
Metal AlloysMetal Alloys
Electrical & Optical Materials Electrical & Optical Materials
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MSE CurriculumMSE Curriculum
DesignDesign
Materials SelectionMaterials Selection
Materials DesignMaterials Design
ElectivesElectives
Electronic DevicesElectronic DevicesPolymer ProcessingPolymer ProcessingBiomaterialsBiomaterials
Polymer EngineeringPolymer Engineering
Cell & Tissue-Cell & Tissue-Biomaterials InteractionBiomaterials InteractionIntermetallics & CompositesIntermetallics & Composites
Advanced BiomaterialsAdvanced Biomaterials
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Biomaterials ConcentrationBiomaterials Concentration
4 required courses 4 required courses
2 MSE 4XX Electives2 MSE 4XX Electives
2 Technical Electives2 Technical Electives
Nanomaterials Concentration planned for Nanomaterials Concentration planned for
2010-2011 Catalog2010-2011 Catalog
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Research OpportunitiesResearch Opportunities
•~ $5 M in annual research funding•Subsidized research opportunities for freshmen & sophomores
•Several research opportunities at ORNL
•Recent undergraduate research topics include Piezoelectric Polymer Fibers Computer Modeling of Micro-Scale Grains Infrared Dichroism of Nonwoven Polymer
Fibers Nanocrystalline Biosynthesized Magnetite Retained Austenite in Magnetically
Processed Steel Processing of Graphite Carbon Foams
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For more information, contact:For more information, contact:
Dr. Kevin KitDr. Kevin Kit
[email protected]@utk.edu
510 Dougherty510 Dougherty
974-7055974-7055