Numerical analysis of the effect of contact pressure on fretting fatigue life in press-fitted shaft

초록

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