低速域・低すべり率域におけるレール／車輪間の過渡的粘着特性（トラクション係数に及ぼす雰囲気の影響）

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タイトル別名
  • Transient Traction Characteristics between Rail and Wheel under Low Velocity and Low Slip Ratio (Variation of Traction Coefficient by Environmental Conditions)
  • Variation of Traction Coefficient by Environmental Conditions
  • トラクション係数に及ぼす雰囲気の影響

抄録

This paper describes an experimental investigation on transient traction coefficient using a twin disc rolling-sliding frictional machine, which simulates the actual contact condition of rail and wheel under the low slip ratio and low velocity. The experimental results show the effects of temperature, relative humidity (RH), water, surface roughness and hardness, which have important influence, on the traction characteristics. As a result, with increasing temperature around test discs, traction coefficient decreased under constant RH condition. Increasing RH resulted in a decrease of traction coefficient under constant temperature condition. Furthermore, with increasing sliding distance under dry condition, traction coefficient increased linearly at first and reached to a peak, and then decreased a little and became steady. Up to traction coefficient reaches a peak after a test start, surface roughness and hardness decreased a little, and during traction coefficient decreased after the peak, surface roughness and hardness increased rapidly due to wear. On the other hand, as sliding distance increased under wet condition, traction coefficient increased linearly at first gradually and became steady. Until reaching maximum traction coefficient after a test start, surface roughness increased a little and hardness decreased a little. After then, surface roughness decreased a little, and hardness increased due to work-hardening. Moreover, the primary factors, which traction coefficient increased immediately after a test start, were associated with surface roughness, hardness, and such boundary films as oxide film, reaction film.

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