Molds & Tooling
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Poor PVA fatigue resistance
Problem Phenomenon
PVA product fatigue life <10⁴ cycles, below the 10⁵ cycle requirement
Cause Analysis
PVA elastic recovery insufficient, each cycle accumulates plastic deformation; crosslinking degree on the low side, fatigue cracks propagate fast
Solution
1) Increase crosslinking degree to improve recovery and reduce accumulated deformation; 2) Select high molecular weight grade to raise the 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 the key
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