류일 연구실

Dislocation dynamics modeling could allows us to understand the physical origin for plastic deformation. This concurrently coupled multi-scale plasticity model can capture detailed dynamics evolution of dislocation structures and can predict macroscopic constitutive response. In addition, the developed model could account for complex multi-physical phenomena, which would play an important role in obtaining a fundamental understanding of deformation mechanism in nanostructural metals. Nanostructural metals show enhanced mechanical properties. For optimal design, it is critical to understand the deformation mechanism in the microstructure. To understand the underlying mechanisms that control the mechanical properties of nanostructured metals, an insight into the role of the grain boundary in dislocation-driven plastic deformation is vital. The grain boundary has been observed as a dislocation source, sink, or having no effect, which in turn, gives rise to different macroscopic mechanical responses. We propose a high-fidelty model for dislocation interaction with various grain boundary (GB), employing it to effectively capture atomistic interaction mechanism on the GB, by means of mesoscale defect dynamics model. We apply our mesoscale polycrystal plasticity model to investigate defect-driven mechanical properties. Materials for extreme environments can help to protect people, structures and the planet. Extreme temperatures in aeroplane engines, high-strain rate loading and hydrogen embrittlement and radiation doses in nuclear reactors are just some examples of extreme conditions that materials need to withstand. We investigate deformation plasticity under multi-physical environments for materials for different types of extreme environments. It is a great challenge to expl