题目：Particle Dynamics Simulation of Microstructure Evolution Toward FGM Manufacturing Usingthe PDPS

报告人：Huiming Yin博士，Civil Engineering and Engineering Mechanics，Columbia University，USA

时间：2016年8月15日上午9:00--10:00

地点：综合1号实验室楼602

 Abstract：A novel invention for the solar roofing substrate material has been proposed to use the functionally graded materials (FGMs) because of its unique thermal and mechanical properties. It has been successfully fabricated by sedimentation of different types of particles under vibration in the laboratory. To understand the physics behind the sedimentation process cross scales where some phenomena cannot be captured by the continuum methods, numerical studies have been conducted to couple the dissipative particle dynamics (DPD) and discrete element method (DEM) to study the size effect on particle sedimentation process without vibration, where the interactions between liquid-liquid and solid-liquid particles are described by DPD, while the solid-solid particles interaction is described by DEM. A parallel computing software, particle dynamics parallel simulator (PDPS), is developed to use the DPD/DEM approach to simulate the sedimentation process. To further understand the vibration effect on the FGM fabrication, different approaches have been used to mimic the vibration effect from the vibration table in the laboratory. Results are compared and verified by the experimental data. The vibration magnitude, frequency and direction effects on the fabrication of graded microstructure have also been investigated and discussed in details. Results have demonstrated that the material gradation can be significantly amplified by vibration. The present DPD/DEM model provides a very useful tool for the material design and optimization of the solar roofing materials.The software package of PDPS also considers other types of the particle interaction forces and has been applied to other virtual experiments of particle systems.

Bio：Dr. Huiming Yinreceived his Bachelor degree from the Hohai University, China, in 1995, Master degree from the Peking University, China, in 1998, and PhD degree from The Iowa University in 2004. Before joining Columbia University in 2008, Dr. Yin was employed by Caltrans as a Civil Engineer in the Transportation Laboratory at Sacramento, California, for two years (2006-08) and by University of Illinois at Urbana-Champaign as a Post-Doctoral Research Associate in the Department of Civil and Environmental Engineering for two years (2004-06). Dr. Yin’s research focuses on the multi-physical and mechanical characterization and modeling of civil engineering materials and their applications in energy efficient infrastructure systems.He received the NSF CAREER Award in 2010.