Frame-side mounting points for the CR26E EV power systems.
Carry the ten load-based accumulator mounts. Each attachment point, including brackets, backing plates and inserts, must withstand 15 kN minimum in any direction.
No part-specific design process is documented. The EV Structures subsystem design process applies: 1. Take the battery segment geometry from Energy Storage: five segments at 15 lb each. 2. Lay out the tower, then set wall thicknesses from available stock above the rules minimum (floor 3.2 mm, walls 2.3 mm). 3. Validate segment structure by hand using Roark's formulas for a plate under uniform pressure, at 40 g fore/aft and lateral and 20 g vertical. Fore/aft gave sigma_max 5.75 ksi and FoS 2.78; lateral gave 9.17 ksi and FoS 1.75; down gave 0.833 ksi and FoS 19.2. 4. Validate each mount independently for static shear, pull-out and bending, fixed at a 0.25 in weld perimeter, at the 15 kN rules requirement. 5. Run structural equivalency for the load-bearing columns: mounting tabs, side wall and front wall cross sections, with I = A*t^2/12. 6. Waterjet the walls, weld on a jigging table with aluminium cube jigs, mill the mounts and weld them to the side walls.
Waterjet or laser cut, then TIG welded to the frame in the welding jigs.
Steel, welded.
None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.
Nothing in CrimsonStorage covers these yet.