关键词: 平均应力, 径向基函数, 近似模型, 振动疲劳, 疲劳寿命预测

Abstract:

In order to consider the mean stress effects on the structural vibration fatigue life under cyclic loads,the paper proposed a method to revise the Tovo-Benasciutti  fatigue damage model. An approximate model between the mean stress correcting coefficient and the random stress band coefficient was built with radial basis function, and the Tovo-Benasciutti fatigue damage model was built under considering the mean stress effects. The fatigue life for a simple beam was estimated with Tovo-Benasciutti fatigue damage model under considering the mean stress effects, the results show that the Tovo-Benasciutti fatigue damage model under considering the mean stress effects can get a closer result to the test.

Key words: mean stress, radial basis function, approximate model, vibration fatigue, fatigue life prediction