Abstract
This study investigates the influence and mechanisms of friction blocks with varying aspect ratios on the asymmetrical wear of brake pads under high-speed and heavy-load braking conditions. A large megawatt-level wind turbine brake device was used, and the Archard wear model was integrated into the analysis of brake interface wear characteristics through finite element method (FEM) and arbitrary Lagrangian-Eulerian (ALE) technology. A thermal-mechanical-wear coupling model was developed for brake systems with five different aspect ratio friction blocks, and its accuracy was validated through wear tests on an inertial brake test bench. A method for calculating tangential and radial wear is proposed to characterize the degree of asymmetrical wear at the friction interface. The study revealed a non-uniform wear distribution at the contact interface, with greater wear observed at the leading and outer edges of the friction block. A small aspect ratio (L/W < 1.5) predominantly results in radial wear, while a large aspect ratio (L/W > 1.5) leads to tangential wear. An aspect ratio of 2:1 balances radial and tangential wear, indicating improved wear resistance.
Published Version
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