The results show that the fatigue damage variable of pearlite ductile cast iron as a function of fatigue cycle varies according to the index law.
结果表明：球墨铸铁的疲劳损伤变量随疲劳周数呈指数规律变化；
Conclusion: The increase in mechanical properties may be a response to repeated stress and may function as a mechanism to resist tendon damage due to mechanical fatigue.
结论：跟腱力学性质的变化是对重复应力刺激的一种反应，是肌腱对抗力学疲劳的机制。
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