Abstract
Fretting damage can be observed in automobile and railway vehicles, fossil and nuclear power plants, and aircrafts. In the present study, the railway axle material RSA1 was used to evaluate fretting fatigue life. Plain and fretting fatigue tests were conducted using a rotary bending fatigue tester with a ring and a bridge-type contact pad. The fretting fatigue limit of a standard specimen was approximately 37% lower than the plain fatigue limit. In the Shinkansen-type specimens, cracks were initiated in the contact area and finally fractured at σamp = 214 MPa. Similarly, cracks were generated early in the rounded areas of all TGV-type specimens and induced fracturing. Tire tracks and rubbed scars were also observed in the oblique crack and fatigue crack growth regions of the fractured surface. Wear debris was detected on the contact surface, and oblique cracks were initiated in the contact area at an early stage. The results of this study can be used to evaluate the structural integrity of railway axles.
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