Test method for friction coefficient of Railway Tie Plate

The importance of friction requirements
Prevent rail creep: Sufficient friction prevents rail displacement due to longitudinal forces during train operation.
Maintaining track geometry: Friction helps maintain the alignment of the track.
Reduce maintenance costs: Good friction performance can extend the service life of the sleeper and pad.

Coefficient of friction requirements
Static friction coefficient: Usually between 0.4 and 0.6.
Dynamic friction coefficient: slightly lower than the static friction coefficient, but to meet the requirements of preventing rail crawling.

Test method
Laboratory test
Friction testing machine: used to measure the friction coefficient between the plate and the rail.
Surface roughness test: The surface roughness meter is used to measure the roughness of the contact surface of the pad.

Field test
Longitudinal resistance test: Measuring the displacement of the rail under longitudinal forces.
Bolt torque test: to ensure that the bolt fastening force meets the design requirements.