Interrelation of the volume temperature of modified oils and local temperatures in the friction contact zone under extreme operating conditions

A methodology has been developed that allows, using the temperature criterion, to determine the thermomechanical stability of oils and, thus, to analyze the modification of oils to improve the lubrication efficiency and wear resistance of friction pairs of conformal internal combustion engine units operating under extreme conditions. The correlation relationship between the temperature in the local frictional contact zone and the bulk temperature of the modified oil was determined with an increase in the maximum contact stress during the running-in period with a corresponding shift of the correlation linear dependences towards high temperatures. Under conditions of operation up to 15 cycles, increased thermomechanical stability of the modified oil was established in comparison with the standard oil, which confirms the optimal structural adaptability of the modified layers to extreme operating conditions.