Speaker
Description
Dislocation-mediated plastic deformation plays a crucial role in determining the mechanical behavior and microstructural evolution in contact mechanics, yet establishing a robust multiscale linkage remains a challenge. Here, we introduce a crystal plasticity model based on continuum dislocation dynamics that integrates microscale dislocation behavior with \linebreak macroscale plastic deformation under contact conditions. In addition to crystallographic influences on dislocation mobility, the model is also capable of capturing subsurface dislocation transport, and trace line formation under sliding contact, unveiling complex microstructural features that impact plastic deformation, surface topography, and the evolution of contact area and contact pressure—key features influencing plasticity in contact mechanics. Unlike traditional continuum simulations that lack microstructural resolution or discrete simulations that fail to couple microstructure-driven plasticity with evolving contact conditions, our approach bridges these limitations. By employing an implicit macro-microscale coupling mechanism, a flux vector splitting upwind scheme for positive-preserving dislocation transport while solving the dislocation dynamics problem, and a penalty contact boundary condition accounting for plastic deformation effects on contact properties, the model achieves high numerical stability on the multi scale coupling computation. This framework provides a predictive foundation for understanding dislocation-driven deformation in contact mechanics, encompassing applications such as indentation and tribological loading.
