Kun-Wook Kang

We study shock behavior of single crystalline nickel (Ni) using molecular dynamics (MD) simulations. Five different embedded-atom method (EAM) potential models were tested to select a suitable potential for shock simulation by comparing Grüneisen parameter, a key parameter in the equation of state describing energy change before and after shock load. We conducted shock propagation simulations along ⟨100⟩ direction of Ni and extracted (1) pressure-volume Hugoniot curve and (2) shock velocity (U s

We carry out molecular dynamics simulations of nanoindentation to investigate the effect of cementite size and temperature on the deformation behavior of nanocomposite pearlite composed of alternating ferrite and cementite layers. We find that, instead of the coherent transmission, dislocation propagates by forming a widespread plastic deformation in cementite layer. We also show that increasing temperature enhances the distribution of plastic strain in the ferrite layer, which reduces the stres

This study shows topology optimization of lower control arm (LCA), made of carbon fiber reinforced plastic (CFRP), that was originally composed of aluminum alloy. By mean-field homogenization (MFH) method, averaged mechanical properties of CFRP are applied to FEM analyses of 3D LCA model. The design target is to reduce the LCA weight while satisfying the multiple constraints including required stiffness and durability conditions at the same time. As a result, authors propose the new design of CF

The necessity for environment-friendly material development has emerged in the recent automotive field due to stricter regulations on fuel economy and environmental concerns. Accordingly, the automotive industry is paying attention to carbon fiber reinforced plastic (CFRP) material with high strength and stiffness properties while the lightweight. In this study, we determine a shape of lower control arm (LCA) for maximizing the strength and stiffness by optimizing the thickness of each layer whe

The effects of crystal orientation on the optical gain characteristics of blue AlInGaN/InGaNquantum-well (QW) structures with a reduced internal field were investigated by using the non-Markovian model with many-body effects. The AlInGaN/InGaN system has a larger matrix elementthan the conventional InGaN/GaN system because the former has a smaller internal field than thelatter for relatively small crystal angles. As a result, for QW structures with a relatively smallcrystal angle ( = 30), the Al