Dissipation wear model under mixed lubrication based on entropy imbalance phenomenon

Abstract

Real wear process has entropy imbalance characteristic. Entropy equilibrium is a hypothetical ideal situation. In this paper, the dissipation wear model based on the entropy imbalance characteristic is proposed for improving wear prediction accuracy under mixed lubrication. Firstly, it is revealed that the imbalance between wear heat generation and dissipation leads to entropy imbalance. The prediction errors of wear rates by entropy-balanced assumption are more than 40 %. Then, evaluation parameter of entropy-imbalanced degree is defined by rotating normalized entropy generation-flow coordinate. Entropy-imbalanced dissipation wear model and corresponding wear life prediction method are obtained. Finally, it is verified that prediction errors of the proposed model and method are less than 10 % and 5 % through 20-hour wear life experiments under mixed lubrication.