A New Method for Measuring Fatigue Damage of Metallic Materials under Cantilever Bend Loading
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摘要: 基于损伤力学理论,提出了一种金属材料疲劳损伤测量的新方法。即采用光滑板状试样,通过悬臂弯曲加载方式,以10CrNiMo钢为对象,研究金属材料疲劳损伤与其宏观参量——施力点位移特征量的相关性。研究结果表明,金属材料的疲劳损伤与其施力点位移特征量峰值满足特定的函数关系。据此,可以通过监测施力点位移特征量峰值的变化,来间接测量金属材料的疲劳损伤,并和相同加载条件下该材料的疲劳损伤临界值进行比较,从而为金属材料的安全服役和剩余寿命评估提供依据。Abstract: Based on the damage mechanics theory, a new testing method in measurement of fatigue damage of metallic materials was proposed. The relation of fatigue damage of metallic materials such as 10CrNiMo steel to one of its macro-parameters displacement characteristic at loaded point was investigated under cantilever bend loading and adopting smooth plate specimens.The results manifested that fatigue damage of metallic materials and its displacement characteristic peak value at loaded point satisfy a special functional relation, through which fatigue damage of metallic materials could be measured indirectly by inspecting change of displacement characteristic peak value. The measured fatigue damage value could be compared to critical fatigue damage value and could provide reference for safe service and remaining life evaluation of metallic materials.
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Keywords:
- Cantilever bend loading /
- metallic materials /
- fatigue damage /
- measurement method
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