Research News

Woo Kyun Kim | Department of Mechanical and Materials Engineering

My research area is the atomistic modeling and computer simulation of materials systems. Using atomistic simulation methods such as molecular dynamics (MD) I have modeled nanoindentation and AFM (Atomic Force Microscope) experiments. Furthermore, I have developed “hyper-QC” that can simultaneously extend length and time scales of conventional atomistic models by coupling hyperdynamics and quasicontinuum (QC), two leading temporal and spatial multiscale methods. Hyper-QC enables to simulate larger systems for longer durations than fully-atomistic unaccelerated models.

Figure 1.  An atomistic model for the AFM                                                                    experiment of oxidized silicon surfaces.

 

 

 

Figure 1.  An atomistic model for the AFM experiment of oxidized silicon surfaces.

Figure 2. Illustration of the AFM modeled by the hyper-QC method. As shown, the region near the contact between the tip and the substrate is fully atomistic while the other regions are modeled by the FEM mesh.

 

 

Figure 2. Illustration of the AFM modeled by the hyper-QC method. As shown, the region near the contact between the tip and the substrate is fully atomistic while the other regions are modeled by the FEM mesh.