题目：Field-dependent viscoelasticity of magnetorheological composites

报告人：Prof. Lizhi Sun（University of California）

时间：2024年8月29日（周四）15:00-17:00

地点：师昌绪楼403会议室

Abstract: Magnetorheological (MR) elastomers are smart composite materials whose mechanical behavior can be tailored by the application of magnetic fields. We herein developed a new generation of magnetorheological elastomer composites with the addition of nanofillers. The viscoelastic responses of the MR nanocomposites to applied magnetic fields were investigated through dynamic mechanical analysis as well as multi-scale and multi-physics modeling approach. It is found that a small amount of fillers can effectively improve the mechanical performance of conventional MR elastomers. The MR nanocomposites demonstrate not only large jumps in zero-field dynamic stiffness and damping, but also higher field-induced improvement in these dynamic mechanical properties. In addition, a micromechanics-based viscoelastic constitutive model of nanocomposites is developed with a particular focus on the effect of fibrillated interface between polymer and particles. 

Bio: 

Dr. Lizhi Sun is Professor in the Department of Civil and Environmental Engineering, Samueli School of Engineering, University of California, Irvine, CA, USA. His primary area of research is the micro-/nano-mechanics of heterogeneous composites with applications in civil, mechanical, and biomedical engineering. He has published more than 150 journal papers in the field of mechanics of materials and structures. Dr. Sun is an editor for International Journal of Damage Mechanics and an associate editor for Journal of Engineering Mechanics and for International Journal of Biomedical Imaging. He is a fellow of AAAS and ASCE’s Engineering Mechanics Institute (EMI).