Abstract
Discrete dislocation plasticity (DDP) calculations are carried out to investigate the response of a single crystal contacted by a rigid sinusoidal asperity under sliding loading conditions to look for causes of microstructure change in the dislocation structure. The mechanistic driver is identified as the development of lattice rotations and stored energy in the subsurface, which can be quantitatively correlated to recent tribological experimental observations. Maps of surface slip initiation and substrate permanent deformation obtained from DDP calculations for varying contact size and normal load suggest ways of optimally tailoring the interface and microstructural material properties for various frictional loads.
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This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) (No. EP/N025954/1).
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Yilun XU. He is a research associate at Department of Materials and Mechanical Engineering of Imperial College London. His research focuses on the multi-scale modelling of the micromechanical behaviour of alloys subject to multi-physics.
Daniele DINI. He is head of the Imperial College Tribology Group, one of the largest tribology groups in the world. His group is at the forefront of the development of multiscale and multidisciplinary high-fidelity approaches that capture the physics of critical tribological interfaces, from the underlying molecular scale to the macroscale seen by engineer as performance, e.g. energy efficiency and reliability.
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Xu, Y., Balint, D.S., Greiner, C. et al. On the origin of plasticity-induced microstructure change under sliding contacts. Friction 11, 473–488 (2023). https://doi.org/10.1007/s40544-022-0624-7
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DOI: https://doi.org/10.1007/s40544-022-0624-7