Study on Contact Rolling Fatigue of Rails : 2nd Report, Analysis by High Speed Rail Testing Machine

概要

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This is a report on the result obtained by using a high speed rail testing machine, which is described in the first report. The contact rolling defects of the actual rail were observed in the laboratory. Especially, the running surface layer of the rail was investigated in detail and the possibility of surface crack propagation was analyzed by fracture mechanics. The main results obtained are as follows: (1)Defects on the running surface; cracks are initiated at the surface and propagate much in the wheel running direction and a little in the opposite direction. In this test, however, white phase is observed in the running surface layer and cracks run out through the phase is observed in the running surface layer and cracks run out through the white phase. (2) Head checks at the gauge corner; many cracks occur at the gauge corner with the same pitch and with the same inclination to the wheel direction. (3) The above tendency is very similar to that the Shinkansen. (4) The possibility of crack propagation was calculated by fracture mechanics and would be very small for shorter cracks of 0.5 mm in depth due to the friction effect of cracked surfaces themselves.
一般社団法人日本機械学会の論文