If piston-ring tribo-pair was simulated during wear test then how we can do test at high temperatures ?
Going by the sliding interactions (direction of sliding reversed every 180 degree crank angle rotation) which are directly proportional to the engine speed, a piston ring and cylinder liner may double up as a tribo-pair. In normal operation, the thin oil film prevents metal-metal contact and any wear of liner can occur during abnormal conditions like engine oil starvation, engine overheating, oil that's past its useful life etc. when liners get scuffed or scored by the rings).. I am not sure about how piston groove and rings behave as tribo-pair.. Only during change of direction at TDC and BDC, there may be switch over in the mating faces of ring grooves. For high temperature wear studies, you require a special chamber with heating set up and temperature monitoring inside which the pin-on-disk like studies can be conducted
https://iopscience.iop.org/article/10.1088/1757-899X/1059/1/012020/meta
https://iopscience.iop.org/article/10.1088/1757-899X/1114/1/012051/meta
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