The Effect of Fretting Wear on Fatigue Crack Initiation Site of Press-fitted Shaft

압입축에 발생하는 프레팅 마모가 피로균열 발생 위치에 미치는 영향

  • 이동형 (한국철도기술연구원, 철도시스템연구본부) ;
  • 권석진 (한국철도기술연구원, 철도시스템연구본부) ;
  • 최재붕 (성균관대학교, 기계공학부) ;
  • 김영진 (성균관대학교, 기계공학부)
  • Published : 2007.10.31


The objective of the present paper is to evaluate the effect of the evolution of contact surface profile by fretting wear on the contact stress distribution and fatigue crack initiation site of press-fitted shaft by means of an analytical method based on experimental data. A finite element analysis was performed to analyze the stress states of press-fitted shaft, considering the worn contact surface profiles of shaft. The evolutions of contact stress as wearing of contact surface were analyzed by finite element analysis and fatigue crack nucleation sites were evaluated by fretting fatigue damage parameter (FFDP) md multiaxial fatigue criteria. It is found that the stress concentration of a contact edge in press-fitted sha손 decreases rapidly at the initial stage of total fatigue life, and its location shifts from the contact edge to the inside due to fretting wear as increasing of fatigue cycles. Thus the transition of crack nucleation position in press-fitted shaft is mainly caused by stress change of a contact edge due to the evolution of contact surface profile by fretting wear. Therefore, it is suggested that the nucleation of multiple cracks on fretted surface of press fits is strongly related to the evolution of surface profile at the initial stage of total fatigue life.


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