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CB400F Frame Bracing

Common study data

     Material - Plain carbon steel
     Braking Loads - 1200lbs upward on lower bearing race face
     8400 lbs opposing on each of the upper and lower bearing race faces, normal to a plane passing axially along the steering axis.

     Torsion Loads - 1200lbs upward on lower bearing race face
     5000 lbs opposing on each of the upper and lower bearing race faces, normal to a plane passing axially along the centerline of the bike.

Study #1 - Stock CB400F - There is more deflection shown here than in the previous frame study. I re-measured and re-modeled many of the frame components in this study to be more accurate, and changed the material from AISI 1020 to plain carbon steel.

 

Braking Mode

Torsion Mode

 

 


FEA1 - Side bracing

Braking Mode

Torsion Mode


FEA 2 - Side Bracing and Shock Mount Bracing

Braking Mode

Torsion Mode


FEA 3 - Side bracing and Suspension Bracing

Braking Mode

Torsion Mode


FEA 4 - Side, Swingarm, and Shock Bracing

Braking Mode

Torsion Mode


FEA 5 - Side, Swingarm, and Shock Bracing

Braking Mode

Torsion Mode


FEA 6 - "Boxed" spine.

Someone on one of the forums had questioned me about boxing the spine of the frame. Round tube is stiffer torsionally than square, so I looked at adding an extra 2" dia. spine to the frame. The results are a little misleading, because the deflection numbers are worst than for the stock frame. But I also included the stress plots for this version, and the stock frame, below. Have a close look and you can see that the stiffer spine has moved the stresses to other, more flexible areas, resulting in more displacement at the head.

Braking Mode

Torsion Mode

Stock Frame Stress Plot

FEA 6 Stress Plot

  


 

FEA 7 - Fully Braced.

I threw everything at it. It is the stiffest of all the studies, but would also be the heaviest, adding about 9lbs of extra steel.

 

Braking Mode

Torsion Mode


FEA 8 - Side Bracing with extra tubes to steering head.

I really thought that this would make a bigger difference, but I think it needs extra tubes to stabilize the long tube.

Braking Mode

Torsion Mode

 

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