Page 29 - ASME IMECE 2018 Program

and depth-sensing indentation methods, also known as
nanoindentation. The ability to make such measurements
with sharp pyramidal indenters allows for high point-to-point
spatial mapping of properties as well as the characterization
of very thin films, thin surface layers, and even small particles
or individual phases in complex multiphase microstructures.
Although most nanoindentation testing has been done at
room temperature, recent advances in nanoindentation
testing equipment have expanded the horizons to very
high temperatures, thus paving the way for the small-scale
measurement of parameters characteristic of time-dependent
creep deformation, such as the stress exponent, n, and
the activation energy, Qc. However, in doing so, serious
experimental difficulties are often encountered, and how one
converts the data obtained in nanoindentation tests to the
parameters normally used to characterize uniaxial creep is
not at all straightforward because of the complex, nonuniform
stress state produced during indentation contact.
In this presentation, we report on progress in making
meaningful measurements of power law creep by
nanoindentation based on recent experience with a new high
temperature nanoindentation system capable of testing at
temperatures up to 1100°C. Special attention is given to the
models and data analysis procedures needed to convert
nanoindentation load-displacement-time data into the creep
parameters normally measured in uniaxial tension or
compression testing. The models and procedures are
evaluated by comparison to several sets of creep data in which
the material behavior has been probed both by
nanoindentation and by uniaxial testing methods.
AESD Lecture and Reception
5:00pm–7:00pm Gutgsell Professor at the University of Illinois Urbana–Champaign
Room 411, David L. Lawrence Convention Center
Frank Kreith Energy Award
William M. Worek, Department of Mechanical and Industrial
Engineering, Texas A&M University—Kingsville, Texas
William M. Worek is Professor of Mechanical
Engineering at Texas A&M University–
Kingsville, TX. He received all three degrees,
B.S., M.S. and Ph.D. from the Illinois Institute
of Technology in 1976, 1977 and 1980.
He spent a majority of his career at the
University of Illinois–Chicago, where he was Department
Head of Mechanical and Industrial Engineering and Director
of the Energy Resources Center.
He has been involved, over the last 35 years, in the
development of desiccant materials for cooling systems
applications, modeling of sorption processes, experimental
testing of desiccant material performance and the use of
desiccant processes in the design of cooling and
dehumidification systems. He holds three patents on sorption
system design improvements and has published extensively in
archival journals and has given numerous lectures on the
subject. Recently he has expanded his research to investigate
the enhancement when nanofluids are boiled.
Professor Worek was chair of the American Society of
Mechanical Engineer’s (ASME’s) Solar Energy Division, Vice-
President of ASME’s Energy Resources Group and served as a
Member of ASME’s Board of Governors. In addition, he is Fellow
of ASME and ASHRAE and has received Edwin F. Church Medal
from ASME recognizing his accomplishments in engineering
education. In addition, Professor Worek Co-editor of Mark’s
Handbook for Mechanical Engineering, Executive Editor of
Applied Thermal Engineering and Editor-in-Chief of Heat
Transfer – Asian Research.
Title: Challenges in Comfort Cooling: Separating Sensible
and Latent Loads—Material Constraints and New
Opportunities
As buildings have become tighter and as Net Zero Energy
Buildings are designed and implemented, the latent cooling
load has increased, and improved performing heating systems
are desired. This presentation will present the status of current
technologies and the efforts to improve performance and the
capacity per unit volume (i.e., minimization of footprint) of
heating and cooling systems. Conventional heating systems
have limited efficiencies, many times less than one. Likewise,
thermally-activated cooling/dehumidification systems also have
relatively poor efficiencies. This presentation will focus on work
done and new developments in materials and systems that are
showing that performance can be significantly improved.
Applied Mechanics Koiter Lecture
5:30pm–6:30pm
Room 408, David L. Lawrence Convention Center
Professor M. Taher A. Saif, Edward William and Jane Marr
Professor M. Taher A. Saif received his B.S.
and M.S. in Civil Engineering from Bangladesh
University of Engineering and Technology and
Washington State University, respectively, in
1984 and 1986. He obtained his Ph.D. in
Theoretical and Applied Mechanics from
Cornell University in 1993. He worked as a Post Doctoral
Associate in Electrical Engineering and the National
Nanofabrication Facility at Cornell University during 1993–
1997. He joined the Department of Mechanical Science and
Engineering at the University of Illinois at Urbana–Champaign
(UIUC) during 1997. He is currently the Gutgsell Professor in
the department. He is serving as the Associate Head of
Graduate Programs and Research.
Two of Saif's major contributions are: (1) discovery of plastic xxvii
strain recovery in nano grained metals and its underlying
mechanism. The finding opens the possibility of developing
self-healing metal components; (2) discovery of mechanical
tension in neurons in vivo, and the link between this tension
and neurotransmission. This latter finding links mechanical
force with memory and learning in animals. His current
research includes tumor micro environment, mechanics of
neurons and cardiac cells, development of biological
machines, and electro-thermo-mechanical behavior of
nanoscale metals and semiconductors.