Material Drying
2 views
PA66 fatigue cracks
Problem Phenomenon
Cracks appear at the root of PA66 snap-fits after repeated assembly and disassembly
Cause Analysis
Stress concentrates at the snap-fit cantilever root, repeated bending accumulates fatigue, and low dry-state toughness accelerates crack initiation; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Enlarge root fillet; limit assembly/disassembly angle; moisture condition before assembly; verify by assembly/disassembly life test; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Snap-fit fatigue relies on fillet design and moisture conditioning toughness guarantee; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
Was this helpful?
0 people found this helpful
Thank you for your feedback!