Critical length scale controls adhesive wear mechanisms

Area of Science:

• Mechanics
• Materials Science
• Tribology

Background:

• Adhesive wear, a fundamental tribological process, is poorly understood.
• Current adhesive wear prediction relies on empirical models with limited applicability.
• The exact mechanism by which contacting surface asperities generate wear particles remains elusive.

Purpose of the Study:

• To reconcile discrepant observations and predictions of adhesive wear mechanisms.
• To develop a unified framework for understanding adhesive wear.
• To advance physics-based wear prediction models.

Main Methods:

• Atomistic simulations utilizing model interatomic potentials.
• Formulation of a simple analytic model.
• Comparison of simulation results with experimental data.

Main Results:

• A transition in the asperity wear mechanism was identified at a critical contact junction length scale.
• Discrepant wear observations were reconciled into a unified framework.
• An analytic model was developed to predict this transition.

Conclusions:

• The study provides a unified understanding of adhesive wear mechanisms.
• The findings enable the development of physics-based wear laws, reducing reliance on empirical coefficients.
• This research facilitates expanded use of computational modeling in wear process exploration.