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Due to technical issues with manufacturing the bottom panel, it was no longer possible to manufacture a structural bottom panel. To accommodate for this change in design, additional tubes were added to the Chassis to support passenger weight. Tubes have been added underneath the seats of the driver and passengers. An additional semi-structural floor would be added on top of these tubes to provide more structural integrity.
Past Construction of Bottom Panel:
Carbon Fiber Layers
1 inch nomex core
Carbon Fiber Layers
New Plan for Bottom Panel:
Semi-structural floor made out of carbon fibre reinforced polymer (likely 1/4 inch core)
1 inch tubes
Carbon Fiber Layers
Chassis simulations had to be carried out to ensure that the new chassis re-design still passes vehicle collision scenarios. The following are the results for the simulations. Since the design features only the chassis being structural, only the beam tool was used in this stress analysis of the vehicle collisions. The minimum combined stress and the maximum combined stress.
Summary of Chassis Vehicle Collision Simulations Analysis
Vehicle Collision | Minimum Combined Stress (MPa) | Maximum Combined Stress (MPa) | Notes |
|---|---|---|---|
A Pillar | Majority Max: 300 | ||
B Pillar | 200 | ||
C Pillar | 170 | ||
Front 30 Wall | 350 | ||
Front 60 Wall | 265 | ||
Front Bar | 305 | ||
Side 30 Wall | 390 | ||
Side 60 Wall | 120 | ||
Top 30 Wall | 1410 | ||
Top 60 Wall | 1537 | ||
Top | 532 |
4130 Chromoly Steel Material Properties
Property | Value |
|---|---|
Young’s Modulus (MPa) | 198 000 |
Poisson’s Ratio | 0.294 |
Bulk Modulus (MPa) | 160190 |
Shear Modulus (MPa) | 76507 |
Tensile Yield Strength (MPa) | 435 |
Compressive Yield Strength (MPa) | 435 |
Tensile Ultimate Strength (MPa) | 652 |
Compressive Ultimate Strength (MPa) | 475 |
It seems that yield strength for 4130 chromoly steel has been approximated as 460 MPa for MSXII
Minimum Combined Stress Results
Comments: Max strength seems to be 909 MPa, but that is at a very small point very close to the collision object. The stress might be on the collision object itself. The rest of the Chassis seems to be in a cool blue region which can go up to 300 MPa
Maximum Combined Stress Results
