Molds & Tooling
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Poor fatigue resistance of PU
Problem Phenomenon
PU product fatigue life <10⁴ cycles, below the 10⁵ cycles requirement
Cause Analysis
PU elastic recovery insufficient, plastic deformation accumulates each cycle; crosslinking degree too low, fatigue cracks propagate 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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