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Final Design

Manufacturing

Testing

Compression

Compression testing was done on both the calf and the rack shaft to guarantee that they can withstand body weight.

The calf was able to withstand a load of 2700 pounds  and the rack shaft able to withstand 2300 pounds.

Compression of the Calf

 

Youngs Modulus
(psi)

Load at Break [lbf]

Max Load [lbf]

Strain at Max Load [in/in]

27,458

2005.69

2691.18

0.0140

 

Compression of the Shaft

Youngs Modulus
[psi]

Load at Yield (Zero Slope)
[lbf]

187109

2291.19657

Compression of the QUV Treated

With the chance of exposure to the sun, an ultra violet light resistance test was done on a piece of the calf. A compression test was done on a sample exposed to the UV light and one that was not. The UV exposure did not decrease the mechanical properties.

 

Specimen

Load at Break (Standard)
[lbf]

Compressive extension at Break (Standard)
[in]

Max Load
[lbf]

Young’s Modulus
[psi]

QUV Treated (1)

538.03823

0.05815

724.50417

68733

No QUV Treatment (2)

304.56222

0.06335

506.12798

63758

CME 475/480 ◦ Design Project I/IIWinona State University ◦ Winona, MN

Last Update: May 6, 2015