The simulation app for mixed-EHL rolling-sliding line contacts has been developed based on the capabilities of the Cam-Roller-Interface Tribotester (CRT-01). The CRT-01 as well as the simulation app, allow the user to evaluate the resulting slide-to-roll ratio (SRR) and traction coefficient (among others) generated in a lubricated roller on roller (i.e., disc on disc) configuration when a load torque is applied to the driven roller.
Differently from classic twin disc machines, the CRT-01 allows the generation of slippage throughout the application of a load torque (i.e., braking torque) to one of the rollers. This means that slippage is not a fixed variable during the test but, a result of the applied braking torque. Hence, changes in the tractive behavior of surfaces produced by wear (or other factors) can be studied based on the variations of the SRR measured through the test. The interested user can refer to https://www.tribonet.org/news/testing-of-cam-roller-follower-systems/ and https://www.youtube.com/watch?v=LViW5rxueoM for more information about the testing method and the test setup.
Instructions for use:
The mixed-EHL simulator for rolling sliding line contacts is divided into 3 different panels. The reference conditions, the controls, and the results.
- Reference Conditions:
A set of reference conditions is given by default. They include contact conditions, material properties, and lubricant properties. The user can modify these values and click "Run" to display the results.
- Control Panel:
The app allows the adjustment of 5 parameters for the simulation, namely, the load (L), the speed (ωR1), the temperature of the lubricant, the load torque, and the offset angle (Ψ). Note that with Ψ=0, the contact force is equal to the load (L). After adjusting the controls, the results can be obtained by clicking "Run".
The results panel displays several results that can be used to evaluate the tribological behavior of the simulated contact. They include the lambda ratio, the traction coefficient, and the slide-to-roll ratio, among others. Note that the slide-to-roll ratio increases when higher load torques (i.e., braking torque) are applied.