常幅值疲劳数据与随机疲劳数据的等效

The Equivalent of Constant Amplitude Fatigue Data and Random Fatigue Data

为了得到随机环境下的疲劳寿命数据,基于Bendat法和Miner线性累积损伤,将常幅值疲劳数据转化为等效随机疲劳数据,并与文献中的随机疲劳数据进行对比,有较好的拟合结果。根据此方法,计算得到飞机结构中典型材料的随机疲劳数据,与文献中随机振动下耐久性试验数据相差不大。此法可以得到随机疲劳寿命数据,从而对随机振动疲劳进行快速评估,对结构设计有一定的参考意义。

In order to obtain the fatigue life data in random environment,the constant amplitude fatigue data is transformed into the equivalent random fatigue data based on the Bendat method and Miner linear cumulative damage,and compared with the random fatigue data in the literature,the results are satisfactory.According to this method,the random fatigue data of typical materials in aircraft structure are calculated,which is not different from the data of durability test under random vibration in literature.The method proposed in this paper can obtain the random fatigue life data,so that the random vibration fatigue can be evaluated quickly,which has some reference significance for the structural design.