Chassis Simulation for 2020-10-03 Re-design

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.

Concerning Vehicle Collision Results Overview

This table outlines vehicle collision scenarios that were above the magnitude of 300 MPa

Vehicle Collision

Minimum Combined Stress (MPa)

Maximum Combined Stress (MPa)

Notes

Vehicle Collision

Minimum Combined Stress (MPa)

Maximum Combined Stress (MPa)

Notes

A Pillar

 

300

 

B Pillar

-388

 

 

Back Bar

 

 

 

C Pillar

 

359

 

Front 30 Wall

 

 

 

Front 60 Wall

 

 

 

Front Bar

 

 

 

Side 30 Wall

 

 

 

Side 60 Wall

 

 

 

Top 30 Wall

-320

335

 

Top 60 Wall

 

 

 

Top

-336

327

 

4130 Chromoly Steel Material Properties

Property

Value

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

 

Maximum Combined Stress Results