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Cheetah Flex-Foot® A Carbon Fiber – Reinforced Polymer Team RAMROD September 22, 2011.

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Presentation on theme: "Cheetah Flex-Foot® A Carbon Fiber – Reinforced Polymer Team RAMROD September 22, 2011."— Presentation transcript:

1 Cheetah Flex-Foot® A Carbon Fiber – Reinforced Polymer Team RAMROD September 22, 2011

2 High performance prosthetic feet Designed to mimic the action of the anatomical foot Stores and releases energy produced by the user Made of Carbon Fiber Composites Comfort… power… agility…

3 Carbon Fiber Filaments Carbon fiber is produced through a polyacrylonitrile (PAN) precursor The carbon fibers can come out of three different spinning processes: wet, dry, and melt spinning The stabilization step of the fibers ensures sufficient cross-linking to be able to withstand the final heat treatment The end product is a highly advanced graphite composite material

4 Epoxy Epoxy is a highly versatile cross-linkable polymer for carbon fiber-epoxy composites The monomers making up the epoxy polymer must contain at least two strained-ring groups, called oxiranes The oxiranes contain one oxygen and two carbon atoms which able to be attached to a wide variety of organic molecules The properties of an epoxy, like adhesive strength and lifespan, can be greatly improved by a co-reaction with other specific compounds, most often multifunctional amines

5 Cheetah blades start as: Rolls of resin-impregnated carbon fiber The rolls are cut into square sheets Pressed onto the outside of a steel mold Milled in the shape of the legs’ final profile. Anywhere from 30 to 90 carbon-fiber sheets are layered one on top of another. The whole thing is swung into an Autoclave Melts and fuses the resin and sheets into a solid, contoured carbon-fiber plate. Once the compound cools, a robotic arm with a high- pressure water jet on the end carves the now curved sheet into several Cheetah legs

6 Bibliography “Applied Mechanics and Materials.” Trans Tech Publications 70 (2011): Carbon (fiber). (2011, September 21). In Wikipedia, The Free Encyclopedia. Retrieved 10:54, September 22, Manocha, L. M. "Carbon Fibers." Encyclopedia of Materials: Science and Technology. Ed. K. H. Buschow. Vol. 2. Kidlington, Oxford, UK: Elsevier Science, Print. Hodgkin, J. “Thermosets: Epoxies and Polyesters." Encyclopedia of Materials: Science and Technology. Ed. K. H. Buschow. Vol. 10. Kidlington, Oxford, UK: Elsevier Science, Print. "How Engineering has transformed Sport." Portia Ltd. Portia, Web. 22 Sep “Reinforced Plastics and Composites.” Sage Publications 30.9 (2011):

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8 INGREDIENTS Solvents: water, hexylene glycol and benzyl alcohol Preservatives: cyclotetrasiloxane, imidazolidinyl urea, benzalkonium chloride Sodium chloride: increases viscosity of the product Benzyl alcohol: soothing agent which relieves irritation and pain Potassium phosphate: acts as a buffer to maintain a pH level close to 7.5; doesn’t irritate eyes Disodium EDTA: metal ion chelator; aids in cleaning skin and prevents metal deposits on the skin Poloxamer 184 (polyoxypropylene block polymer 184): a surfactant which helps reduce surface tensions; forms an emulsion with other ingredients and makes it easier to remove makeup and oil

9 Water: non-toxic (0) Cyclotetrasiloxane: low; irritant Sodium chloride: low; skin irritant (1) (LD50): 3000 mg/kg [Rat.]. Poloxamer 184: low (1) (LD50): 5000 mg/kg [Rat]. Imidazolidinyl urea: low; mild eye irritant; formaldehyde releaser (1) (LD50): >2250 mg/kg [Birds.]. Hexylene glycol: low/moderate; skin irritant (2) (LD50): 3097 mg/kg [Mouse]. Benzyl alcohol: moderate; hazardous by skin contact and ingestion (2) (LD50): 1040 mg/kg [Rabbit]. Disodium EDTA: low; skin/eye/respiratory tract irritant (2) (LD50): >2000 mg/kg [Rat]. Benzalkonium chloride: high; mutagenic (3) (LD50): 240 mg/kg [Rat].  LD50: Lethal Dose (50% of subjects died)


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