Modeling and Simulation of Defects in Materials Using an Innovative Multiscale Methodology

Dr. Shengfeng (Stephen) Yang

Assistant Professor

Department of Mechanical and Energy Engineering

Purdue School of Engineering and Technology

Indiana University Purdue University Indianapolis

Abstract: One of the most formidable challenges in the progress of multiscale methods is to interface atomistic models with continuum theories. To meet this challenge, a concurrent atomistic-continuum (CAC) method and a computational simulation tool have been developed. The CAC simulation tool can allow the passage of discontinuities, including dislocations and cracks, from the atomistic to the continuum domain without the need for additional treatments. The capabilities of the CAC are also demonstrated by its applications in simulating the complex behaviors of multiple types of defects in strontium titanate. By incorporating the effect of chemical composition, the ultimate goal of this research is to develop an innovative multiscale chemical-thermal-mechanical methodology, which is able to predict materials behavior from their multiscale microstructures and chemical composition and further push beyond the limits of past engineering and scientific experiences to design new materials and structures for energy and defense-related applications.

Bio Sketch: Dr. Shengfeng Yang is an assistant professor in the Department of Mechanical Engineering at Indiana University–Purdue University Indianapolis (IUPUI), USA. Before joining IUPUI, he was a postdoctoral researcher at the University of California, San Diego, where he was leading the development of a computational material science tool to construct interfacial phase diagrams for metallic alloys and ceramic materials. He received his Ph.D. degree in Mechanical Engineering from the University of Florida in 2014. Prior to this, he earned his bachelor’s degree in Engineering Mechanics and master’s degree in Solid Mechanics from Huazhong University of Science and Technology in China. He has been working on many national research projects, including research funded by NSF, DARPA, Department of Energy and most recently Department of Defense. His research interests include computational mechanics, multiscale-multiphysics modeling, and scientific computing with a particular focus on the thermo-mechanical and dynamical properties of materials including metallic alloys, ceramics, biological composite, and energy conversion and battery materials.

时 间：2018年6月7日下午4: 00

地 点：南一楼三楼力学系会议室

邀请人：杨新华教授