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Composite Tweel TM for a Bicycle

Composite Tweel TM for a Bicycle. Aer E 423 Project Katarzyna Szemplinska. 12/13/2008. Background. Michelin’s product development Tire and wheel combined into one – Tweel TM Tweel TM objectives Replace conventional tires Reduce maintenance costs Improve performance.

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Composite Tweel TM for a Bicycle

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  1. Composite TweelTMfor a Bicycle Aer E 423 Project KatarzynaSzemplinska 12/13/2008

  2. Background • Michelin’s product development • Tire and wheel combined into one – TweelTM • TweelTM objectives • Replace conventional tires • Reduce maintenance costs • Improve performance

  3. Project Description • Apply TweelTM concept to bicycle wheels • Analyze TweelTM feasibility and performance

  4. Project Design • Different spoke designs • Multiple composite materials combinations • Assumptions: • Load is split equally between the two wheels • Load is applied vertically • Initial configuration: • Outer Rim Diameter = 24 in. • Inner Rim Diameter = 4 in. • Load per Wheel = 90 lbs.

  5. Manufacturing • Spokes: Carbon fiber prepreg • 4-ply layup • Cured in an autoclave • Warping • Outer and Inner Rim: Fiberglass with Epoxy • 4-ply hand layup • Cured at room temperature • Spoke Reinforcement: Fiberglass with Epoxy • 2-ply hand layup • Cured at room temperature • Mold Structure: Styrofoam • Hand cut

  6. Final Product

  7. Testing • Compression testing • MTS testing machine • Preliminary testing: Spoke

  8. Testing • TweelTM Compression Testing

  9. Testing

  10. Results • Spoke bending was successful • Rim/spoke interface strength was not sufficient • Outer rim flexibility needs to be eliminated • Load transfer to spokes • Concept is feasible • Performance evaluation with improved design

  11. Questions?

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