materials
DESCRIPTION
Materials. “Materials can effectively generate and capture students’ interest in science, mathematics, engineering, and technology.” -Dr. Thomas Strobe University of Washington. Why Study Materials?. Materials in bulletproof vests worn by Police - PowerPoint PPT PresentationTRANSCRIPT
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MaterialsMaterials
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“Materials can effectively generate and capture students’ interest in science, mathematics, engineering, and technology.”
-Dr. Thomas Strobe
University of Washington
“Materials can effectively generate and capture students’ interest in science, mathematics, engineering, and technology.”
-Dr. Thomas Strobe
University of Washington
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Why Study Materials?Why Study Materials?
Materials in bulletproof vests worn by Police
Warm, lightweight, waterproof winter coats
Materials have played a significant role in field of engineering and education
Materials in bulletproof vests worn by Police
Warm, lightweight, waterproof winter coats
Materials have played a significant role in field of engineering and education
http://www.alpineco.com/bulletproofvests.htm
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FYIFYI
Interesting points about advanced materials Markets for advanced ceramics grew from less
than $2 billion in 1987 to over $20 billion in 2000
Materials consume up to 50% of manufactured goods cost
According to U.S. Office of Technology, a key to remaining competitive in the world is to train more scientists and technologists with a broad background in advanced materials
Interesting points about advanced materials Markets for advanced ceramics grew from less
than $2 billion in 1987 to over $20 billion in 2000
Materials consume up to 50% of manufactured goods cost
According to U.S. Office of Technology, a key to remaining competitive in the world is to train more scientists and technologists with a broad background in advanced materials
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History of Materials Science
History of Materials Science
Babylonians first makers of ceramic building materials
Imprinted clay tablets used to teach trades from parents to offspring in 2200 B.C.
Time periods named after dominantly-used material
Babylonians first makers of ceramic building materials
Imprinted clay tablets used to teach trades from parents to offspring in 2200 B.C.
Time periods named after dominantly-used materialhttp://www.livius.org/zo-zz/zopyrus/zopyrus.html
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Time PeriodsTime Periods
8000 B.C. - Hammered Copper7000 B.C. - Clay Pottery6000 B.C. - Silk Production5000 B.C. - Glass Making4000 B.C. - Smelted Copper (Bronze Age)1000 B.C. - Iron Age500 B.C. - Cast Iron300 B.C. - Glass Blowing105 A.D. - Paper
8000 B.C. - Hammered Copper7000 B.C. - Clay Pottery6000 B.C. - Silk Production5000 B.C. - Glass Making4000 B.C. - Smelted Copper (Bronze Age)1000 B.C. - Iron Age500 B.C. - Cast Iron300 B.C. - Glass Blowing105 A.D. - Paper
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Time PeriodsTime Periods
600 - 900 - Porcelain1540 - First Foundries1774 - Crude Steel1789 - Discovery of Titanium1800 - Battery1824 - Portland Cement1850 - Reinforced Concrete1856 - Bessemer Steel-making Process1870 - Celluloid Production
600 - 900 - Porcelain1540 - First Foundries1774 - Crude Steel1789 - Discovery of Titanium1800 - Battery1824 - Portland Cement1850 - Reinforced Concrete1856 - Bessemer Steel-making Process1870 - Celluloid Production
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Time PeriodsTime Periods
1871 - Periodic Table1884 - Nitrocellulose1886 - Electrolytic Reduction of Aluminum1891 - Silicon Carbide1907 - First Totally Synthetic Polymer1923 - Tungsten Carbide1930 - Fiberglass1937 - Nylon1947 - Germanium Transistor
1871 - Periodic Table1884 - Nitrocellulose1886 - Electrolytic Reduction of Aluminum1891 - Silicon Carbide1907 - First Totally Synthetic Polymer1923 - Tungsten Carbide1930 - Fiberglass1937 - Nylon1947 - Germanium Transistor
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Time PeriodsTime Periods
1950s - Silicon Photovoltaic Cells & Transistors
1958 - Ruby Laser1959 - Integrated Circuit1966 - Fiber Optics1986 - High Temperature Super Conductors
Data Courtesy of Dept. of Energy and Energy Concepts, Inc.
1950s - Silicon Photovoltaic Cells & Transistors
1958 - Ruby Laser1959 - Integrated Circuit1966 - Fiber Optics1986 - High Temperature Super Conductors
Data Courtesy of Dept. of Energy and Energy Concepts, Inc.
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New MaterialsNew Materials
New materials are designed based on need
Engineers can design without worrying if a material exists for their application
New materials are designed based on need
Engineers can design without worrying if a material exists for their application
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Characteristics of Materials
Characteristics of Materials
Strength (Stiffness) Ability to resist effects of tension,
compression, and torsion forces Ductility
How well a material can be shaped without fracturing
Brittleness When a material will break while undergoing
small deformations
Strength (Stiffness) Ability to resist effects of tension,
compression, and torsion forces Ductility
How well a material can be shaped without fracturing
Brittleness When a material will break while undergoing
small deformations
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Characteristics of Materials
Characteristics of Materials
Hardness Ability to resist indentation and wear
Elasticity Ability to return to original shape after
deformation Electrical Conductivity
Ability to conduct electrons/electricity Thermal Conductivity
Ability to conduct heat
Hardness Ability to resist indentation and wear
Elasticity Ability to return to original shape after
deformation Electrical Conductivity
Ability to conduct electrons/electricity Thermal Conductivity
Ability to conduct heat
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Classifying MaterialsClassifying Materials
Metals
Ceramics
Polymers
Composites
Metals
Ceramics
Polymers
Composites
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MetalsMetals
Earliest used were “native” metals Copper, Gold, Silver, and Meteoric Iron
Can be classified as Ferrous or Non-Ferrous Ferrous
Contain 50%+ of iron Attract magnetic materials
Non-Ferrous Contain less than 50% iron Do not attract magnetic materials Higher corrosion resistance
Earliest used were “native” metals Copper, Gold, Silver, and Meteoric Iron
Can be classified as Ferrous or Non-Ferrous Ferrous
Contain 50%+ of iron Attract magnetic materials
Non-Ferrous Contain less than 50% iron Do not attract magnetic materials Higher corrosion resistance
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Metals Mechanical Properties
Metals Mechanical Properties
Strong Tough Malleable Ductile Most are
Opaque Lustrous Dense Good Heat and Electric Conductors High Melting Point
Strong Tough Malleable Ductile Most are
Opaque Lustrous Dense Good Heat and Electric Conductors High Melting Point
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Metal FactsMetal Facts
Iron and Steel are 1st and 2nd most commonly used metals
Aluminum is thirdLightweightCan be stronger than steel
Iron and Steel are 1st and 2nd most commonly used metals
Aluminum is thirdLightweightCan be stronger than steel
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CeramicsCeramics
Derived from Greek word - keramosBurned material
Early applications were building materials and containers
Glass, although considered a ceramic, is a separate partLacks crystalline organization
No orderly atomic structure
Derived from Greek word - keramosBurned material
Early applications were building materials and containers
Glass, although considered a ceramic, is a separate partLacks crystalline organization
No orderly atomic structure
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CeramicsCeramics
Clay products Refractories
Used in high temperature applications
Made of clay
Abrasives Extremely hard, pure,
ceramic compounds or mixtures
Glasses
Clay products Refractories
Used in high temperature applications
Made of clay
Abrasives Extremely hard, pure,
ceramic compounds or mixtures
Glasseshttp://skovsantik.dk/keramik+stentøj.htm
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PolymersPolymers
Formed by Greek words: Poly - Many Mer - Parts
Natural Materials Wood, leather, cotton,
wool, silk, rubber Polymers processed
by plants and animals Proteins, Enzymes,
starches, and cellulose Plastics
Formed by Greek words: Poly - Many Mer - Parts
Natural Materials Wood, leather, cotton,
wool, silk, rubber Polymers processed
by plants and animals Proteins, Enzymes,
starches, and cellulose Plastics
http://www.hydropolymers.com/en/products/pvc/
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PlasticsPlastics
Polymers and Plastics ARE NOT the same Plastics are a member of the polymer group
Are Synthetic Polymers Thermoplastic
Can be reformed Recyclables
Thermoset Once set, cannot be softened by heat
Polymers and Plastics ARE NOT the same Plastics are a member of the polymer group
Are Synthetic Polymers Thermoplastic
Can be reformed Recyclables
Thermoset Once set, cannot be softened by heat
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More About PolymersMore About Polymers
Are not strong
Good electrical insulators
Low melting temperatures
Are not strong
Good electrical insulators
Low melting temperatures
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Polyethylene TerephthalatePolyethylene Terephthalate
PETE Recycle Code - 1 Most comes from
beverage containers 99% pure, granulated
recycled PETE sells half cost of new PETE
Recycled Uses Fiberfill of jackets,
strapping, liquid soap bottles, surfboards, paint brushes, tennis ball fuzz, and more beverage bottles
PETE Recycle Code - 1 Most comes from
beverage containers 99% pure, granulated
recycled PETE sells half cost of new PETE
Recycled Uses Fiberfill of jackets,
strapping, liquid soap bottles, surfboards, paint brushes, tennis ball fuzz, and more beverage bottles
http://www.designinsite.dk/htmsider/mb0011.htm
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High-density PolyethyleneHigh-density Polyethylene
HDPE Recycle Code - 2 Well-developed process
for recycling Recycled Uses
Drain pipes, flower pots, plastic lumber, trash cans, automotive mud flaps, kitchen drain boards, beverage bottle crates, stadium seats, recycling bins, traffic barrier cones, golf bag liners, and toys
HDPE Recycle Code - 2 Well-developed process
for recycling Recycled Uses
Drain pipes, flower pots, plastic lumber, trash cans, automotive mud flaps, kitchen drain boards, beverage bottle crates, stadium seats, recycling bins, traffic barrier cones, golf bag liners, and toys
http://www.inglass.com/hdpe_bottles.htm
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Polyvinyl Chloride or VinylPolyvinyl Chloride or Vinyl
PVC or V Recycle Code - 3 Not burned due to
release of hazardous fumes Dioxins and Furans
Recycled Uses Drainage pipes, pipe
fittings, floor tiles, bottles, doormats, hoses, mud flaps
PVC or V Recycle Code - 3 Not burned due to
release of hazardous fumes Dioxins and Furans
Recycled Uses Drainage pipes, pipe
fittings, floor tiles, bottles, doormats, hoses, mud flaps
Plastic Separating System
http://www.labs.nec.co.jp/rel/english/topics/t12.html
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Low-density PolyethyleneLow-density Polyethylene
LDPE Recycle Code - 4 Burned in incinerator-
powered generators to produce electricity
Recycled Uses in where color is not important Garbage can liners,
grocery bags, paint buckets, fast food trays, lawn mower wheels, and automobile battery parts
LDPE Recycle Code - 4 Burned in incinerator-
powered generators to produce electricity
Recycled Uses in where color is not important Garbage can liners,
grocery bags, paint buckets, fast food trays, lawn mower wheels, and automobile battery parts
http://www.pop-international.com/POP/products_plastic.htm
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PolypropylenePolypropylene
PP Recycle Code - 5 Recycled Uses
License plate holders, desktop accessories, hanging files, food service trays, flower pots, and trash cans
PP Recycle Code - 5 Recycled Uses
License plate holders, desktop accessories, hanging files, food service trays, flower pots, and trash cans
http://www.cawalker.co.uk/index.asp?id=43
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PolystyrenePolystyrene
PS Recycle Code - 6 Most challenging to
recycle Styrofoam cups and
packing material made Some methods for
recycling in place Chemists still looking for
more effective ways to recycle huge amounts
PS Recycle Code - 6 Most challenging to
recycle Styrofoam cups and
packing material made Some methods for
recycling in place Chemists still looking for
more effective ways to recycle huge amounts
http://www.lafourmi.be/contenu/produits/decorer/decorer_polystyrene.html
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CompositesComposites
Combination of two or more constituent materials bonded together in an effort to provide better properties than those of the individual materials
Ubiquitous in recreational equipment
Used extensively in International Space Station and make over 10,000 pounds of each space shuttle
Combination of two or more constituent materials bonded together in an effort to provide better properties than those of the individual materials
Ubiquitous in recreational equipment
Used extensively in International Space Station and make over 10,000 pounds of each space shuttle
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Composite HistoryComposite History
Ancient Israelites and Egyptians added straw to bricks to hold them together
Incas used plant fibers to strengthen pottery The Colosseum (Coliseum) and other
ancient Roman structures were held together with cement containing slackened lime and pozzolana (hydraulic cement) Slackened Lime
Heating lime and crumbling by adding water Pozzolana
Volcanic ash from Mt. Vesuvius
Ancient Israelites and Egyptians added straw to bricks to hold them together
Incas used plant fibers to strengthen pottery The Colosseum (Coliseum) and other
ancient Roman structures were held together with cement containing slackened lime and pozzolana (hydraulic cement) Slackened Lime
Heating lime and crumbling by adding water Pozzolana
Volcanic ash from Mt. Vesuvius
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What consists in a composite?
What consists in a composite?
ReinforcementPart that provides strength to
compositeShape of a fiber, whisker, or particulate
MatrixGlue that holds everything together
Boundary in between
ReinforcementPart that provides strength to
compositeShape of a fiber, whisker, or particulate
MatrixGlue that holds everything together
Boundary in between
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Lay UpsLay Ups
Unidirectional and bidirectional carbon fiber, Kevlar, and plain-weave fiberglass used in lay ups
Composed of consecutive layers of fabric, resin, and sometimes a core material
Unidirectional and bidirectional carbon fiber, Kevlar, and plain-weave fiberglass used in lay ups
Composed of consecutive layers of fabric, resin, and sometimes a core material
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Laid Up By Hand vs. Factory
Laid Up By Hand vs. Factory
Form materials on a mold and paint the them on the matrix of resin (epoxy) My Be Difficult to
Use, but inexpensive Combined by two
different parts Resin Hardner
Form materials on a mold and paint the them on the matrix of resin (epoxy) My Be Difficult to
Use, but inexpensive Combined by two
different parts Resin Hardner
Factory has materials with epoxy matrix pre-impregnated into More expensive Less mess/easy-
use
Factory has materials with epoxy matrix pre-impregnated into More expensive Less mess/easy-
use
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Epoxy MatrixEpoxy Matrix
When mixed, has a specific time to spend in container to be used “pot life”
Also has prescribed work time based on amount of hardener used Time available to work with materials by
placing and forming into mold/application Start of hardening process is called “going
off” When matrix “goes off,” little work time remains
When mixed, has a specific time to spend in container to be used “pot life”
Also has prescribed work time based on amount of hardener used Time available to work with materials by
placing and forming into mold/application Start of hardening process is called “going
off” When matrix “goes off,” little work time remains
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Effective Lay Up ProcedureEffective Lay Up Procedure
1. Fabric is cut to appropriate size2. Bag, peel ply, perforated plastic, and bleeder
cut to appropriate sizes3. Mold is prepared with gel coat, mold release
and/or wax4. Correct amount of resin and hardener used5. Pot life is not compromised6. Material laid up within appropriate work time
1. Fabric is cut to appropriate size2. Bag, peel ply, perforated plastic, and bleeder
cut to appropriate sizes3. Mold is prepared with gel coat, mold release
and/or wax4. Correct amount of resin and hardener used5. Pot life is not compromised6. Material laid up within appropriate work time
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Effective Lay Up ProcedureEffective Lay Up Procedure
7. No sections of the lay up are “starved” (without correct amount of matrix or the resin or epoxy)
8. No sections are over filled with matrix9. Good seal on the vacuum bag (12-15psi)10. Peel ply is able to be removed with no
folds/creases11. Mold is released from fabric12. Clean up of work area completed
promptly
7. No sections of the lay up are “starved” (without correct amount of matrix or the resin or epoxy)
8. No sections are over filled with matrix9. Good seal on the vacuum bag (12-15psi)10. Peel ply is able to be removed with no
folds/creases11. Mold is released from fabric12. Clean up of work area completed
promptly
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Industry SupportIndustry Support
ASM International (ASMI) Society for
materials engineers and scientists
Dedicated to advancing industry, technology, and applications of metals and materials
ASM International (ASMI) Society for
materials engineers and scientists
Dedicated to advancing industry, technology, and applications of metals and materials
http://mnasm.org/asmintl.htm
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Industry SupportIndustry Support
American Ceramic Society (ACerS)
Dedicated to dissemination of scientific, commercial, and educational information about ceramic materials and industry
American Ceramic Society (ACerS)
Dedicated to dissemination of scientific, commercial, and educational information about ceramic materials and industry