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动力传动链条在工作过程中承受动负荷或周变负荷,因此,当外加负荷虽然尚未达到其极限强度而超过其疲劳强度时,链条就会断裂。
The power transmission chain is subjected to a dynamic load or a weekly load during operation, so that the chain breaks when the applied load exceeds its ultimate strength and exceeds its fatigue strength.