LIFE PREDICTION OF TITANIUM AND ALUMINUM ALLOYS UNDER FRETTING FATIGUE CONDITIONS USING VARIOUS CRACK PROPAGATION CRITERIA--PART 1. EXPERIMENTAL AND CALCULATION TECHNIQUES

摘要

Using the analysis of state-of-the-art techniques of fretting fatigue studies and results of description of multi-stage fatigue crack propagation in fretting zone within fracture mechanics framework, we have refined the calculation-and-experimental technique earlier proposed by the author. This technique allows one to predict current values of the angle and rate of inclined crack propagation in the subsurface layers of material under fretting conditions using calculated stress intensity factors K_I and K_II for contact and bulk loads, as well as experimental crack resistance diagrams by K_I and/or K_II types.