Production & Quality
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EVA fatigue resistance is poor
Fenómeno do problema
EVA product fatigue life <10⁴ cycles, below the 10⁵ cycle requirement
Análise das causas
EVA elastic recovery insufficient, accumulating plastic deformation each cycle; crosslinking degree too low with fast fatigue crack propagation
Solução
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
Conclusão principal
Poor fatigue resistance is caused by insufficient recovery and fast crack propagation; increasing crosslinking is key
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