CEE Seminar (ZOOM): Magnetic Field-dependent Viscoelastic Responses of Magnetorheological Nanocomposites

VIA Zoom Link:
https://uci.zoom.us/j/9126848538?pwd=eFJpSStqemh6OFBVUnV4RTBtdGlhQT09
Meeting ID: 912 684 8538 ~~ Password: 12345
 

Abstract: Magnetorheological (MR) elastomer composites with the addition of multi-walled carbon nanotubes are developed. The viscoelastic responses of MR nanocomposites to applied magnetic fields are investigated through dynamic mechanical analysis. It is found that a small amount of carbon nanotubes 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 magnetic-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 imperfect interface between matrix polymer and carbon nanotubes.

Bio: Lizhi Sun is a professor in the Department of Civil and Environmental Engineering at UC Irvine. His primary area of research is the micro/nano-mechanics of heterogeneous composites with applications in civil engineering and beyond. He has published more than 100 journal papers in the field of mechanics of materials and structures. Sun is an editor for the International Journal of Damage Mechanics and an associate editor for ASCE’s Journal of Engineering Mechanics. He is a fellow of AAAS and ASCE’s Engineering Mechanics Institute (EMI), and has been the technical committee chair for ASCE-EMI Committee on Inelasticity Modeling and Multiscale Behavior (2009-2011), ASCE-EMI Committee on Nanocomposites (2012-2013), and ASCE-EMI Committee on Nanomechanics and Micromechanics (2014-2017).