Simulation Results

Structure:

This page is to stockpile all relevant simulation data on the chassis to maintain a record of what alterations have been made to the chassis, and what effect it had on the stresses.

Each entry in the table should contain:

• The chassis version number
• Recent corrections to the chassis/simulation, and the person responsible for the change 
• An image of the isometric perspective of the chassis with the max stress concentration, and other critical stresses probed (front, rear, side and top collisions)
• Any other relevant comments

Simulations:

• All simulations to be done with 4130 Steel (Yield strength is approximately 460 MPa) 
• Mesh type: Tetrahedron
• Load: 30 000N in respective direction 
• Support type: Fixed

Useful links:

• Buckling example:   
• Buckling background: https://www.clear.rice.edu/mech517/WB16/lectures_trainee/Mechanical_Intro_16.0_AppA_Buckling.pdf 
• Buckling info: https://www.sharcnet.ca/Software/Ansys/16.2.3/en-us/help/wb_sim/ds_buckling_analysis_type.html 

Simulation Data

Chassis Version Number	Person Responsible	Changes made	Front collision	Side collision	Top Collision	Rear Collision	Interesting Images	Comments
Version 14	Matt Suski	Tube Sizes Altered (set to 1.050" and 0.0625" thickness) Combine tool utilized
Version 13	Ritu Shah							Max stress is in one corner (top collision), not symmetrical to other side. Suggests that this is an issue with the modeling of tubes rather than structure. Max side = 241 Max top = 316 Rear max = 195 Front max = 95
Version 13-2-Copy	Shalin Patel Former user (Deleted)							Tried inserting fillet at front joint but results were worse (i.e. max with fillet ~ 132 MPa). Thus, tried same tests without fillets and achieved lower stress results than in V13.
V13-3	Ritu Shah	Removed a bunch of members, adjusted them						Results still well below yield after removing members
V13-4	Ritu Shah	Same as 13-3, but removed top bar						Still looks good
V14	Matt Suski	Version 13.3 except with the tube size changed to 1.050 and 0.0625" thickness						Max stress exceeds both yield and UTS. Weight has decreased to be 55 kg
V14-2	Matt Suski	Version 14 with some tube sizes and types changed						Max stress decreased but corner geometry of square and round is unnatural
V16_2	Matt Suski	Version 14_3 with the suspension changed to fit new geometry, as well cross section removed after simulation
V16	Saif Hafeez	Used Version 16 to perform a buckling test and get a sense of where we are. *DONE WITH 1018, AS 4130 FILE CURRENTLY BROKEN*						From what I know, to compute out critical buckling force, use the load multiplier located in the top left of the images. This value is essentially our safety factor with an applied 30 000 N force. LoadMultiplyer x 30 000 N = Critical Buckling Force
VR3 Version	Shalin Patel	UniversityOfWaterlooMidnightSunChassis version, removed two front members to get it to mesh						Maximum stress at orange parts is around 460 MPa, only two corners at the front have a stress of 1430 MPa. May be resulting from removing the two members to get the mesh working.