Strut Bearing Failure Analysis: Root Causes from Fracture and Wear Patterns
Why Analyze Failures
Replacing without analysis brings the same failure back. Analysis finds design, material, assembly or usage root causes.
Common Modes
- Fatigue spalling: Flakes on raceway - overload or poor lube
- Pitting: Dense small pits - contact fatigue
- Wear: Polished raceway, size change - lube failure or grit
- Fracture: Cage or ring cracks - impact or material defect
- Corrosion: Red-brown - seal failure
Pattern to Cause
- Spalling on one side - misalignment
- Even wear all round - grease issue
- Local dents - hammering or debris
Using FMEA
- List failure modes
- Rate severity, occurrence, detection
- Prioritize RPN
- Apply preventive controls
Huami Approach
DFMEA for new parts and PFMEA for processes - failure modes addressed at design validation.