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Aidan Lehal

Aidan Lehal

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Contents:

Table of Contents
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Constraints and Requirements Considered

  • Roll Cage

  • Impact Force/Strength

  • Attachment requirements

  • Stiffness

  • Tube-Tube Attachment Type

  • Manufacturing Type

  • Price

Tube Profiles Considered

  • Square

  • Cylinder

  • Rectangle (volumetrically inefficient)

  • I-Beam (unidirectional applications)

Tube Types Considered

  • Hollow

  • Solid (too heavy)

...

Analysis of Tubes

After reducing the feasible tubes to 2 options (hollow round tube, and hollow square tube), some research and simulations were conducted to assess the properties of each option. The dimensions of each tube were kept the same to for comparison purposes: 10in long tubes, 1x1x1/16in square, and 1x1/16in round.

...

Decision Making Table

Steel Tube Analysis

Square (10 in of 1x1x1/16in)

Round (10 in of 1in D x 1/16in t)

Benefits

  • Probably easier to mount things onto flat surfaces (aerobody panels, seats/belts, dynamics integration, etc.)

  • Moment of inertia (x/y) = 0.0345 (square) vs. 0.0203 (round)4

    • ~52% Stiffer as a beam (vertical/horizontal deflection)

      • for equivalent diameter

    • ~29% Stiffer in torsion

      • for equivalent diameter

  • Easier to clamp for welding or cutting3

  • Moment of inertia = 0.0203

    • ~27% lighter (~27% less volume of metal)

      • for equivalent diameter1

  • Complex curvature is easier to manufacture (roll cage)2

  • Better disperses the stresses, no real weak points from corners, consistent strength. This quality makes it easier to design with due to no orientation limits.

  • Cheaper/ft.

...

MSXVII Chassis Design Page:https://uwmidsun.atlassian.net/l/c/zfCy6M90

Recommendation for MSXV

...

Ideally a hybrid of both tubes could be used to maximize the benefits of both types. If a compromise of both cannot be made and it’s one or the other, asses assess the benefits of both based on the team’s goals/priorities, and the closest tube to achieving our goals should be picked (e.g. lightest = round, easiest to integrate with other subsystems = square).