The single-shear pivot bung for the front bellcrank where a double shear pivot could not be packaged.
For single shear pivots the stresses are higher and the analysis more complex: the dominant stress becomes the bending moment applied by the force onto the pivot. Bungs being welded brings additional factors: reduced strength in the heat affected zone, potentially imperfect welds causing stress concentrations, and a need to specify and enforce a minimum weld radius.
No part-specific design process is documented. The Bellcranks subsystem design process applies: 1. Take the wheel rate target from kinematics; the bellcrank is named by it (CR26I front is the 150 lb/in wheel rate crank, rear the 200 lb/in). 2. Set the architecture: connection points, pivot location, double or single shear. 3. Size the pivot for shear from the vector sum of rod and damper loads. 4. Run single-plate FEA for deflection first, then stress. CR26I rear single plate at 0.19 in gave FoS 3.54. 5. Calculate the wheel rate change that the measured deflection produces, and confirm it is inside tolerance. 6. Fit and validate the damper position sensor.
Steel.
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.