(11-16-2024) Structure Leads Meeting Notes

Owned by Benjamin Ngo
Nov 16, 2024
2 min read

MS16 Hardpoints

  • FSU have to figure out packaging if shocks are going under chassis tubes

 

MS15.5 Rollcage Sims

  • Shell vs solid sims

    • 460MPa yield strength for 4130 Steel

    • banking on yield strength = 550MPa LOL

    • At weld points (according to ASC): decrease to 430MPa due to heat treatment

    • solid: creates mesh by creating elements throughout thickness - 420MPa (more wiggle room because more accurate)

    • shell: creates mesh on the surface and thickens - 330MPa (1.4 safety factor)

  • Simulated as shell elements, Mesh 5mm

  • Include a little more lower part of chassis → more deflection, less force on upper members

  • case 1: Hoop always pulled back (assume car driving forward)

Solutions

  • How are the contact patches supposed to be simulated?

    • good for us if it shows it produces less stress

  • Chassis set up until suspension points, add elastic joint as fixture at suspension points → absorbs some of the force

    • fixed supports → elastic support could help/make more sense

  • Taco gussets, reduce stress at corners where two tubes join

Next steps:

  • try with solid sims, convert everything to a single solid body

  • Best way to simulate a weld: Add fillets by sweep the cylinder to simulate weld bead at Solidworks; make it a bonded contact at Ansys

    • set to filler material in Ansys

image-20241116-193041.png

  • In shells: can add a connection between contact points

image-20241116-193224.png

MS15 Chassis

  • Set weight reduction goal

    • figure this out

  • Decide by EOT whether we have to re-weld chassis

 

 

Tasks for new members

  • chassis simulation

    • split cases into separate task; delegate FEA sims

  • Latching

    • Canopy & roof latches

  • Tilting

    • Canopy & Roof

    • Tilting forward

      • Egress

      • catches breeze → rip canopy

    • Simple: single axis

    • if yall wanna look into 4 bar linkage, slide forward

  • Horn

  • Machining Tutorial ?

    • give chance for new members to learn to machine

 

Misc

  • Polish and clean canopy