Numerical Analysis of the Effect of Contact Pressure on the Fretting Fatigue Life in a Press-Fitted Shaft

초록

This paper presents a numerical analysis of the effect of contact. pressure on the fretting fatigue life, considering fretting wear in a press-fitted shaft. The fretting wear of press-fitted specimens subjected to a cyclic bending load was simulated under various contact pressure conditions by using a finite-element analysis and a numerical method. The variation of the fretting fatigue according to the change in the contact pressure was evaluated by using a stress-life approach considering the worn contact surface profile. We found that the distribution of contact pressure and the stress concentration at the contact edge of press-fitted shaft varied rapidly as a result of fretting wear at the initial stage of total fatigue life. Furthermore, as a consequence of fretting wear on the contact surface of press fits, the fretting fatigue life exhibited a minimum at a certain contact pressure and became nearly constant at high contact pressures. Therefore, we suggest that the evolution of the stress concentration due to fretting wear plays an important role in assessing the fretting fatigue life.

키워드