uncleflo
Registered since September 28th, 2017
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High Density Polyurethane Antimicrobial Foam (Firm) 3" x 24" x 80"
Saved by uncleflo on January 16th, 2022.
High Density Polyurethane Antimicrobial Foam is the best choice when you need a high-quality, long-lasting and dependable foam ideal for heavy-use applications. Its density means it will provide excellent support while still delivering on comfort, making it ideal for high-traffic seating cushions (such as couches and sofas), benches, cabin seating and sleeping berths, automotive seating and certain outdoor cushions. Its antimicrobial properties help prevent the growth of mold and mildew. For outdoor use, Antimicrobial High Density foam can be used, and silk film should be wrapped around the foam to help keep moisture out. Also use an upholstery fabric that has high water resistance or can be treated with a waterproofing solution.
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Exceptionally high Young's modulus observed for individual carbon nanotubes
Saved by uncleflo on April 4th, 2015.
CARBON nanotubes are predicted to have interesting mechanical properties—in particular, high stiffness and axial strength—as a result of their seamless cylindrical graphitic structure1–5. Their mechanical properties have so far eluded direct measurement, however, because of the very small dimensions of nanotubes. Here we estimate the Young's modulus of isolated nanotubes by measuring, in the transmission electron microscope, the amplitude of their intrinsic thermal vibrations. We find that carbon nanotubes have exceptionally high Young's moduli, in the terapascal (TPa) range. Their high stiffness, coupled with their low density, implies that nanotubes might be useful as nanoscale fibres in strong, lightweight composite materials.
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Shock Mitigation in Low-Density Thermoplastic Foams Part I – Dealing with Inbound Kinetic Energy
Saved by uncleflo on December 7th, 2014.
Low-density thermoplastic foams are frequently used as energy-absorbing foams. That is, kinetic energy from an incoming mass is mostly dissipated in the foam, resulting in little, if any, throwback or reverse propulsion of the mass from the foam. Typically, energy absorption is described in terms of the area under the foam stress-strain curve. The typical stress-strain curve for a low-density foam is depicted as having three general components: At low compression, say, less than about 5%, the foam acts as a Hookean elastic spring. That is, the extent of compression, ε, is directly proportional to the applied stress, σ , with the proportionality, Ef, being the modulus of the foam: σ = Ef ε. For essentially all foams, the modulus of the foam is directly related to the modulus of the polymer, Ep, and the ratio of squares of the foam density, Ep, and polymer density, ρP: Ef = Ep (ρf / ρo)².
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Where We Fly - UK Animation - YouTube
Saved by uncleflo on May 24th, 2013.
Animation to accompany the Sailplane and Gliding article "Where we Fly" by Paul Jessop. This shows the density of glider flights submitted to the BGA ladder over several years.
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