Abstract
Abstract A thermodynamically-based framework for determining the degradation of tribo-components operating under oscillatory motion is introduced. A generalized degradation coefficient B is derived using the degradation-entropy generation (DEG) theorem and its efficacy over Archard wear coefficient in characterizing the degradation during oscillatory operating conditions is experimentally investigated. Laboratory experiments are performed using a pin-on-disk test setup by considering stainless steel (pin) and brass (disk) that cover a wide range of oscillatory operating conditions. Archard and degradation coefficients are determined and compared. It is shown that the degradation coefficient is capable of handling variable-loading sequence and provides a more realistic tool for determining wear volume. An analytical derivation is provided to gain insight and explore the reasons. The validity of the proposed degradation coefficient is demonstrated by applying the procedure to several published experimental results available for different bi-directional sliding configurations. Finally, the efficacy of the proposed method is demonstrated for a tribo-pair experiencing oscillation with variable loading and sliding conditions.
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