Fretting Fatigue Damage Nucleation and Propagation Lifetime Using a Central Point Movement of Power Spectral Density

Abstract EN

This paper presents a new perception in evaluating fretting fatigue damage nucleation and propagation lifetime under periodically forced circulation.

A new approach, which is proposed in this paper, is to measure the change of the central point of power spectral density (CP-PSD) in different structural stiffness degradation stages.

A notable aspect of this study lies in the combination between vibration amplitude and forced frequency of the fatigue-causing factors in beam structures.

Additionally, it is found that randomization of the first phase from 0 to 2π yields more accurate modelling of the fatigue phenomenon.

Results show that the CP-PSD parameter is significantly more sensitive compared to the regularly damage-evaluating parameters such as natural frequency, eigenvalues, or stress value.

This reflects different levels of fatigue cycle effect on the structure in the experiment.

At the same time, CP-PSD also categorizes the degradation level on different points on the structure under the periodically forced circulation.

In addition, this paper also quantifies the relation between the changes of CP-PSD and each fatigue state.

Results of this research will be a reference source to evaluate the lifespan of the structure by experimental methods.