[Faculty] Fwd: [CSRC.COLLOQUIUM] "Magnetorheological CNT Nanocomposites and Their Field-dependent Viscoelastic Responses"

[Jose Castillo]

[image: New CSRC Logo.jpg]



DATE:  *Friday, November 22, 2019*



TITLE:

*Magnetorheological CNT Nanocomposites and Their Field-dependent
Viscoelastic Responses*


TIME:  *3:30-4:30PM*




LOCATION:
*GMCS 314*




SPEAKER/BIO:



*Dr. Lizhi Sun, Professor of Civil and Environmental Engineering,
University of California-Irvine*





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.

Bio: 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: Satchi Venkataram

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