The Use of Critical Plane Approaches to Predict Fretting Fatigue Initiation Life of Components Subjected to Different Contact Stress Fields

摘要

This work describes the application of the Smith, Watson and Topper (SWT) and Fatemi-Socie (FS) critical plane approaches to predict the fatigue initiation life of fretted components. To validate the analysis several tests under closely controlled laboratory conditions are carried out in a Ti-6Al-4V alloy. These classical Hertzian tests revealed a size effect phenomenon where fretting fatigue lives varied with contact size. It is reported that the use of the SWT and FS parameters can not account for the effects of different contact stress fields on the initiation life if the calculation is based only on highly stressed points on the surface. It is shown, however, that satisfactory results can be achieved if high values of the fatigue parameters are sustained over a critical volume.