DATE:

Friday, November 22, 2019

TIME:

3:30 PM

LOCATION:

GMCS-314

SPEAKER:

Dr. Lizhi Sun, Professor of Civil and Environmental Engineering, UCI.

ABSTRACT:

Magnetorheological (MR) elastomer composites with the addition of multi-walled carbon nanotubes (CNTs)
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 have shown 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 was developed with a particular focus on the effect of imperfect
interface between matrix polymer and carbon nanotubes.

Dr. Lizhi Sun is Professor in Department of Civil and Environmental Engineering at University of California,
Irvine (UCI). His primary area of research is the micro/nano-mechanics of heterogeneous composite
materials, with applications in civil, aerospace, mechanical, and biomedical engineering. His research has
been sponsored by various US federal funding agencies. He has published more than 100 journal papers in
the field of mechanics and materials. He wins numerous academic and research awards such as Fellow of AAAS
(2017), Fellow of ASCE’s Engineering Mechanics Institute (2014), UCI Civil and Environmental Engineering
Professor of the Year (2013), AFRL Faculty Fellow (2011), UCI School of Engineering Fariborz Maseeh Best
Faculty Research Award (2008), and Honda Research Initiation Award (2006). Dr. Sun is an editor for
International Journal of Damage Mechanics and an associate editor for ASCE’s Journal of Engineering
Mechanics. He has organized more than 70 symposia for various societies and served as a reviewer for more
than 80 journals and 10 funding agencies (e.g. NSF, NIH, and DoD). Dr. Sun 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).

HOST:

Jose Castillo

DOWNLOAD:

PDF File