Molds & Tooling
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POE fatigue resistance poor
Problem Phenomenon
POE product fatigue life <10⁴ cycles, below 10⁵ cycles requirement
Cause Analysis
POE elastic recovery insufficient, each cycle accumulates plastic deformation; crosslinking degree low, fatigue crack propagates fast
Solution
1) Increase crosslinking degree to improve recovery and reduce accumulated deformation; 2) Select high molecular weight grade to raise fatigue threshold; 3) Product design to reduce stress concentration
Key Takeaway
Poor fatigue resistance is caused by insufficient recovery and fast crack propagation; increasing crosslinking is key
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