Transition from Plastic Shearing to Fracture of Asperity Junctions: Role of a Critical Aspect Ratio

The article investigates the transition between plastic shearing and fracture in asperity junctions during wear processes. It introduces a critical aspect ratio that governs the dominant wear mechanism, whether it be plasticity-induced shearing or fracture-induced debris formation. The study employs finite element simulations and compares its findings with experimental data, demonstrating the accuracy of the proposed model across various materials and scales. The novel approach combines generalized elastic fracture mechanics and shearing formulas, considering both geometrical parameters and material properties. The research highlights the importance of understanding these transitions in wear mechanisms, which can lead to improved material design and reduced wear-related failures in industrial applications.