Molds & Tooling
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MP poor fatigue resistance
Problem Phenomenon
MP product fatigue life <10⁴ cycles, below the 10⁵ cycles requirement
Cause Analysis
MP elastic recovery insufficient, plastic deformation accumulates each cycle; crosslinking degree low, fatigue crack propagates fast
Solution
1) increase crosslinking degree to improve recovery and reduce accumulated deformation; 2) select a 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 key
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