The results show that the fatigue damage variable of pearlite ductile cast iron as a function of fatiguecycle 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；
2
During the experiment, the fatigue-loading was paused after fixed fatiguecycle and the white-light speckle patterns were acquired without loading.
在疲劳加载过程中，按一定的疲劳周次在零载荷状态下停机，并采集试件表面上预先制备的白光散斑图。
3
Since then, the maintenance man can grasp the equipment fatiguecycle, can predict in advance the operating state of mechanical and electrical equipment to ensure normal operation of equipment.