Kim Allen, Sam O’Flaherty, and Austin Schantz

Design NOTE: All dimensions are in inches 3D Conceptual Design Front View Side View Top View

Force Calculations

Force Calculations Continued  Known values F p =250 lbsFS=3 W=575 lbsFS=3  Calculated Values F w = lbs F B = lbs

Force Calculations Continued  Max Deflection=.1 inch  From this Max strain ε max-B =.025 ε max-w =  If F B = lbs Then σ B =F B /A=1.553 psi E B = σ B / ε max-B =61.32 psi= GPa  If F w = lbs Then σ w =F w /A=7.977 psi E w = σ w / ε max = psi=.0121GPa

Composite Design Theoretical Values E 1 (GPa)E 2 (GPa)G (GPa)ν In-Plane Load Bending Load  Initial Values  Calculated Values  Note that the E max =.0121 GPa. This composite lay-up should hold E 1 (GPa)E 2 (GPa)G (GPa)ν S-Glass Fiber/Epoxy Closed Cell Foam Core

Test Section  Small section with same material layup as project  Planned Use: Find the maximum compressive and torsion load the layup could withstand  Actual Use: Identify the difficulties in manufacturing and bagging a 3-D project

Manufacturing  Foam Core Construction Hot WireDrilling the hole for the axle Sanding

 Foam Core

 Laying Up the Foam with Glass Fiber Composite Beginning the Lay-up The Big Wheel Bagged and ready for vacuum curing

 Attaching Front yoke and Preliminary Testing Drilling Holes for BoltsAdjusting Yolk Making sure it holds our weight Making Sure it Moves Smoothly Making Sure it moves and can hold extra weight

Final Product

Testing  Testing Plan Ride around a parking lot Basic turns Riding up a small ramp Test completed 3 times  Results Tests completed successfully Withstood pull-up and torsion forces

Conclusion  Successes Weight rated for an adult rider Withstood forces Project completed!!!!!  Failures Pedals slip within the hub limiting acceleration Metal components added significant weight Test section not suitable for analysis

QUESTIONS?