Seminar & Colloquium
[세미나: 7월 13일(수), 오후 4시] Prof. Ill Ryu, The University of Texas at Dallas
Title
Multiscale modeling of size-dependent plasticity at submicron-length scale
Speaker
Prof. Ill Ryu, Department of Mechanical Engineering, The University of Texas at Dallas, Richardson, TX
Biography
Dr. Ryu is currently an assistant Professor in Mechanical Engineering at University of Texas at Dallas. Ill Ryu received his Ph.D. degree in Materials Science and Engineering with minor in Mechanical Engineering from Stanford University (Advisors: William D. Nix, Wei Cai). After completing his Ph.D., Dr. Ryu continued his research as a postdoctoral research fellow and lecturer at Brown University (Advisor: Huajian Gao). His research interests include multi-scale computational material science, materials mechanical size effect, mechanics of energy materials, and multi-physical modeling of materials science. Especially, his research focused on fundamental understanding of deformation mechanism, which is necessary to design robust and reliable devices from MEMS/NEMSs (Micro-/Nano-Electromechanical Systems) devices at small length scales to Airplane at large length scales.
| Date | Wednesday, July 13th, 2022
| Time | 16:00 ~
| Venue | 33동 223호 (동부 세미나실)
[Abstract]
The multiscale modeling has developed to investigate size-dependent plasticity by coupling conventional continuum crystal plasticity finite element (CPFEM) with a discrete defect (DD) modeling. While the detailed defect microstructure and short-range interaction is handled by DD framework, the long-range elastic interactions with image stress field are calculated by CPFEM (using commercial package (ABAQUS) with user-subroutine), accounting for complex boundary conditions. The proposed model could account for complex multi-physical phenomena, which would play an important role in obtaining a fundamental understanding of deformation mechanism at small scale. Applications of developed concurrent coupled model includes dislocation nucleation at a crack tip, nanoindentation, hydrogen embrittlement at submicron length scale. The developed model will shed light on fundamental investigation of “defect-controlled” mechanical behaviors in crystalline materials, such as plasticity and damage and fracture.
| Host | Prof. Heung Nam Han (880-9240)