Lecture Series Title: Robots: A Lecture Series - Lets Talk About Materials
Sponsor: Lofaro Labs Robotics, DASL@GMU, and the ECE Department

Talk Title: Characterizing the Heterogeneous Material Properties of Solids
Speaker: Dr. Sevan Goenezen from Texas A&M
When: Wednesday May 4th
Time: 12:00 pm to 1:00pm
Where: Engineering 2901

Dr. Goenezen presents a novel approach to solve the inverse problem in
finite elasticity for the non-homogeneous shear modulus distribution solely
from known surface deformation fields. The inverse problem is posed as a
constrained optimization problem under regularization and solved utilizing
the adjoint equations. Hypothetical “measured” surface displacement fields
are created, by inducing indentations on the exterior of the specimen.
These surface displacement fields are used to test the inverse strategy on
a problem domain consisting of a stiff circular inclusion in a softer
homogeneous background. We observe that the shear modulus reconstruction as
well as the shape of the circular inclusion improves with an increasing
number of surface displacement fields. Furthermore, with increasing noise
level in the surface displacement field, the contrast of the
reconstructions decreases.

Dr. Sevan Goenezen received his BS/MS degree (called Diplom in Germany) in
Aeronautical Engineering from the “Rheinisch-Westfaelische Technische
Hochschule Aachen (RWTH)” in Germany in December 2006. He started his Ph.D.
program in spring 2007 at Rensselaer Polytechnic Institute (RPI) and
graduated in May 2011. His Ph.D. work involved the development and
implementation of efficient algorithms to solve inverse problems in finite
elasticity. Its application to nonlinear elasticity imaging of breast
tumors has shown great potential to diagnose breast cancer non-invasively.
He became a finalist for the $30,000 Lemelson-MIT-RPI Prize with his
findings on breast cancer diagnosis using nonlinear elasticity imaging.
After his PhD, Sevan Goenezen became a postdoctoral researcher in the
Biomedical Engineering Department at Oregon Health & Science University,
where he studied congenital heart defects of the embryonic chicken heart
and risk of rupture of abdominal aortic aneurysms using
fluid-structure-interaction computations. He joined the Department of
Mechanical Engineering at Texas A&M University as an Assistant Professor in
September 2013. His research interests are in computational
(bio-)mechanics, growth and remodeling of tissues, non-destructive material
characterization, inverse problems, fluid-structure-interactions, and
multi-scale modeling. During his time at Texas A&M University, he was
awarded the ASME Research Initiation Grant for young faculty sponsored by
the Haythornthwaite Foundation and the Southeastern Conference (SEC)
Visiting Faculty Travel Grant.

Daniel M. Lofaro Ph.D
Assistant Professor, George Mason University
Electrical and Computer Engineering
Director of Lofaro Labs
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