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http://dx.doi.org/10.3795/KSME-A.2007.31.6.701

Experimental Study on Fatigue Crack Initiation and Propagation due to Fretting Damage in Press-fitted Shaft  

Lee, Dong-Hyong (한국철도기술연구원)
Kwon, Seok-Jin (한국철도기술연구원 철도시스템안전연구본부)
Choi, Jae-Boong (성균관대학교 기계공학부)
Kim, Young-Jin (성균관대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.6, 2007 , pp. 701-709 More about this Journal
Abstract
To clarify the characteristics of surface damage due to fretting in press-fitted shaft, experimental methods were applied to small scale specimen with different bending load condition. Fatigue tests and interrupted fatigue tests of press-fitted specimen were carried out by rotate bending fatigue test. Macroscopic and microscopic characteristics were examined using scanning electron microscope (SEM), optical microscope or profilometer. It is found that small fatigue cracks are nucleated early in life regardless of bending stress, and thus the most portion of fatigue life on press fits can be considered to be crack propagation process. Most of surface cracks are initiated near the contact edge, and multiple cracks are nucleated and interconnected. Furthermore, the fretting wear rates at the contact edge are increased rapidly at the initial stage of total fatigue life. It is thus suggested that the fatigue crack nucleation and propagation process is strongly related to the evolution of surface profile by fretting wear in press fits.
Keywords
Press-fitted Shaft; Fretting; Fretting Damage; Fatigue Crack Initiation; Fatigue Crack Propagation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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