Linda Dada & Emily Dreyer Santa Rosa Junior College SRJC, Engr 45, Fall 2010.
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Transcript of Linda Dada & Emily Dreyer Santa Rosa Junior College SRJC, Engr 45, Fall 2010.
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Linda Dada & Emily Dreyer Santa Rosa Junior College SRJC, Engr 45, Fall 2010
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1964- Stephanie Kwolek and her colleagues at DuPont began searching for a new lightweight strong fiber for light, strong tires
1965- discovery of new method of producing polymer chains
1971- high strength Kevlar®(poly-paraphenylene terephthalamide) introduced by DuPont
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The molecular structure includes a Benzene ring which allowed formation of structures on the ring
Alignment of the chains allows Kevlar to be integrated into composite materials
The molecules layer themselves in such a way that in order to break through Kevlar, the molecular bonds have to be broken
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Steel
Kevlar fibers
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Ruptured fibers
“string-cheese” failure
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High modulus High tensile strength at low weight Low electrical conductivity High chemical resistance Low thermal shrinkage High toughness High cut resistance Flame resistant/self extinguishing Immune to electron radiation
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Causes discoloration and degradation of the Kevlar in the presence of oxygen
Not influenced by moisture or atmospheric contaminants
Damaging if the wave is absorbed by the polymer
SOLUTION: It’s coated with something UV resistant (absorbant)
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Vehicle Armor› Spall Liners› Also protects aircraft and helicopter crews
Military Helmets› Absorb 20% more kinetic energy for Ground Troops› Improve mobility and fatigue of GIs because of low weight
Body Armor› Improved Outer Tactical Vest, ballistic inserts, throat and groin
protectors, anti-mine boots and chaps
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•Ropes and cables•Auto hoses and belts•Composite materials•Tires•Fiber optic cables•Sporting goods •Umbilical hoses on offshore oil and gas refineries•Insulation
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Aircraft
Maritime vessels
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In the Mars Pathfinder to reinforce the inflatable landing cushions and securing ropes
> survived 40 million mile journey
Space shuttle and communications satellites to protect against impacts from orbital debris› Hubble Telescope!
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Used in modules of the International Space Station (ISS) to protect from micrometeorites and orbital debris
Helps protect crew from radiation
Basic layout of module wall: 1. metal, 2. Kevlar, 3. main structure (pressure shell),4. thermal insulation
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Lightweight Low thermal expansion Resilient Woven fibers are strong and flexible
› Flexibility absorbs shock from impacts
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Fire Resistant Mattresses Personal Electronics Sports
› Boarding/Skiing› Baseball› Hiking
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KEVLAR UNDERWEAR!!
• Used in the military• Reinforced in places that cover big arteriesImage: http://www.thefirearmblog.com/blog/2010/10/29/kevlar-reinforced-underwear/
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Questions?
Your classmates,
Linda & Em
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http://www2.dupont.com/Kevlar/en_US/ http://www.lbl.gov/MicroWorlds/Kevlar/
index.html www.nasa.gov/ http://www.nasa.gov/multimedia/
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