【摘要】 根据损伤力学原理，用双臂电桥测量电阻的方法，研究了珠光体球墨铸铁的疲劳损伤演变规律。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；根据这个规律，可以计算出临界损伤变量为０．４５；电阻变化对球墨铸铁的疲劳损伤比较敏感；疲劳的开始阶段，电阻的变化是由基体组织中点缺陷产生与聚合引起的，这并不反映材料的真实损伤。更多还原

【Abstract】 According to the principle of damage mechanics, the evolutional law of fatigue damage of pearlite ductile cast iron was studied with double arms electrical bridge for measuring electrical resistivity. 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. On the basis of this law, the critical damage variable can be calculated, that is 0.45. The change of electrical resistivity is very sensible to the fatigue damage of ductile cast iron. But at the beginning of fatigue, the change of electrical resistivity results from the emerging and accumulating of point defect in matrix. This doesn’t represent the real damage of ductile cast iron.更多还原