High energy x-rays and Photo-luminescence spectroscopy to
investigate the mechanics of ceramic coatings for extreme environments and
sensing applications" by Seetha Raghavan
Tuesday, August 12, 2014 11:00 AM to 12:00 PM
CREOL Room 102
CREOL Room 102
Seetha Raghavan
Department of Mechanical and Aerospace
Engineering, University of Central Florida
Abstract:
Ceramics and Ceramic composites hold promise for meeting the
extreme environments that accompany hypersonic and space applications. The
strain-dependent characteristics of ceramics under the effect of light sources,
such as the brilliance of lasers and high energy x-rays, can provide key
information on the behavior that makes these material systems superior, and yet
limits their durability. These non-invasive techniques transcend length scales,
providing high-resolution measurements that target the strain response of
individual materials within the composite. The exploration of these techniques
for in situ measurements under thermal and/or mechanical conditions will be
discussed for thermal barrier coatings (TBC) and alumina nanocomposites. In
TBCs, synchrotron x-ray diffraction measurements provide both qualitative and
quantitative in situ results on the strain evolution over the depth. Here, the
effect of mechanical loads at critical points within the thermal cycle was
determined. In the study of ceramic reinforcements within a matrix,
photo-luminescent spectral peaks reveal load transfer behavior under varying
volume fractions of alumina nanoparticles. Developments made through these
research areas are currently being used to expand the versatility of the
techniques to meet realistic testing environments and to enable structural
diagnostics tools.
Biography:
Dr Raghavan joined UCF in Fall 2008 after completing her
doctoral studies at Purdue University, Indiana, School of Aeronautics and
Astronautics in the area of Structures & Materials. She obtained her M.S.,
Aeronautical Engineering in Structures at SUPAERO (ISAE), Toulouse, France
where she also worked with Messier Bugatti in Velizy, Paris. Prior to this, she
completed her B.Eng in Mechanical Engineering at Nanyang Technological
University, Singapore. She has experience in the aerospace industry where she
was a senior engineer involved in Aircraft Structural Analysis, Aircraft
Maintenance, Repair & Modifications and Non-destructive testing research
& development for Fatigue crack Inspection using Ultrasonic and Eddy
current techniques.
For additional information:
Dr. Bahaa E. A. Saleh
Dean & Director, Professor of Optics
407-882-3326
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