| Table of Contents |
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Logistics Information
Conducted By | Tommy Tran |
Date | 2021-07-16 |
Quick Links
Chassis Reinforcement Attempt 1 meeting - Mechanical - Confluence (atlassian.net)
https://docs.google.com/document/d/1B2brtRLK9Q83bQ87CmbALqR1k8uJYuV-0p5O8A_-x6Q/edit
Working Session Goals
Review sheet metal solution FEA that was completed by Min
Review previous Chassis simulations completed by Jason (MS14) and Matt, Shalin (MS12)
Try to insert current sheet metal model into old simulation setups to see if results will change
Investigate sheet metal solution by using a single sheet metal that is similar to BP (bonded to all tubes), but make it out of steel instead of composites
Arrange detailed FEA review meeting with Mech Advisors to discuss steps and next results
Update team on slackReinforcement Rev 2.0
1. Reviewing Sheet Metal Solution FEA
Simulation File Details | |
|---|---|
Folder Path | D:\Users\Roo\Documents\GrabCAD\MSXIV sims\MS-CHASSIS\Min Spring 2021 Reinforcement Sims |
File Name | July1_TommyRev.wbpj |
...
Collision Scenario | FEA Meeting (Max S. - MPa) | New Result (Max S. - MPa) August 1921, 2021 | 2 Passenger (Max S. - MPa) August 21, 2021 |
|---|---|---|---|
B Pillar | 509 | 407 | 445351 |
Side 60 | 1231 | 1466829 | 648 |
Top 30 | 1595 | 18301700 | 1374 |
2. Review Previous Chassis Simulations
I don’t think this is worth the time.
Better to focus on current solution
MS14
MS12
3. Inserting Current Solution into Old FEA Setups
I don’t think this is worth the time.
Better to focus on current solution
4. Sheet Metal Inquiry
I don’t think this is worth the time.
Better to focus on current solution
5
...
Resources
Mech Advisor Contact List - Mechanical - Confluence (atlassian.net)
Facebook group chat
Plan
Looking to finish work deliverables tonight
Look to schedule detailed FEA review meeting for Monday, July 19, or Tuesday, July 20
Send out messages and arrange meeting by end of day Saturday, July 17
Chassis Specialty People: Matt, Shalin, Jason
...
. Rev 2.0
Collision Scenario | Stress Results (Max S. - MPa) 2 Passenger |
|---|---|
B Pillar | 478 |
Side 60 | 650 |
Top 30 | 1667 |
...
I added a reinforcement in the middle to see if it lowers stresses because it would distribute forces more.
It was found that stresses were the same or increased.
It was also found that some scenarios had the reinforcements suppressed for some reason.
Reconsidering how the fixed boundaries and accelerations are done.
I also played around with the masses. Observations based on Top 30. One of our worst cases.
With all masses suppressed, stresses are below 415 MPa (max 350 ish)
If only front 2 passengers is enabled, it reaches like 1000 MPa.
With only battery box enabled, it reaches like 700 MPa.
I believe how we assign the mass is greatly influencing the stresses.
The current geometry assignments for mass are very concentrated.
When we had the bottom panel, the faces on its surface could be used as geometry assignment which distributed the mass vastly.
6. Rev 3.0 - Surfaces for distributed masses
Collision Scenario | Stress Results (Max S. - MPa) All loads |
|---|---|
B Pillar | 638 |
Side 60 | 946 |
Top 30 | 2021 |
All these stresses are higher than the 1.0 setup mentioned in step 1.
It is worth noting that the surface used was 1 inch thickness using foam density meaning there is extra mass.
Although it does seem to prove that surfaces do not have a major effect in reducing stresses.
7. Notes for Later
Stackup of A, B, C Bulkheads for Min’s sheet metal solution FEA
Purpose: Put really thin layers in the explorative FEA (step 4)
...