Page 45 - ASME IMECE 2018 Program

TRACK PLENARY
Aerospace Engineering and Engineering Mechanics and holds
the Computational and Applied Mathematics Chair III. He is a
Fellow of the American Academy of Mechanics, ASME, AIAA,
ASCE, AAAS; Founder, Fellow, and past President of USACM
and IACM; past Chairman of the Applied Mechanics Division of
ASME; past Chairman of the US National Committee on
Theoretical and Applied Mechanics; and co-editor of the
international journal Computer Methods in Applied Mechanics
and Engineering. Dr. Hughes is one of the most widely cited
authors in Engineering Science. He has received the Huber
Prize and Von Karman Medal from ASCE; the Timoshenko,
Worcester Reed Warner, and Melville Medals from ASME; the
Von Neumann Medal from USACM; the Gauss-Newton Medal
from IACM; and many other national and international awards.
He is a member of the U.S. National Academy of Sciences; the
U.S. National Academy of Engineering; the American Academy
of Arts and Sciences; the Academy of Medicine, Engineering
and Science of Texas; and a Foreign Member of the Royal
Society of London, the Austrian Academy of Sciences, and the
Istituto Lombardo Accademia di Scienze e Lettere. Dr. Hughes
has received honorary doctorates from the universities of Louvain, honorary Member of ASCE, ASME, ACI, and RILEM. He
Pavia, Padua, Trondheim, Northwestern, and A Coruña.
Track 12: Mechanics of Solids, Structures and
Fluids
12-40-2 MECHANICS OF SOLIDS, STRUCTURES AND
FLUIDS PLENARY II
Tuesday, November 13, 9:00am–9:45am
Room 308, David L. Lawrence Convention Center
How to Design Quasibrittle and Lamellar Biomimetic
Structures for Failure Probability <10-6: Gauss-Weibull and
Fishnet Statistics
(IMECE2018-90105)
Zdenek P. Bazant
Northwestern University
Abstract: Similar to nacre (or mother-of-pearl), imbricated
lamellar structures are widely found in natural and man-made
materials, and are of interest for biomimetics. These staggered
imbricated structures are known to be rather insensitive to
defects and have strength and fracture toughness an order-of-
magnitude higher than their constituents. Their deterministic
behavior has been intensely studied, while statistical studies
have been rare and no theoretical basis for the probability
density function (pdf) of strength has yet been formulated. This
paper presents a theoretical and numerical study of the pdf of
strength and of the corresponding statistical size effect. After
reasonable simplifications of the shear bonds, a lamellar axially
loaded lamellar shell is statistically modelled as a fishnet pulled Carnegie Mellon University
diagonally. A FE model is developed and used in many millions
of Monte Carlo simulations of strength. An analytical model for
failure probability of the fishnet is developed and matched to
the computed statistical histograms of strength of fishnet
structures of various sizes. Based on fresh results at
Northwestern, post-peak progressive softening of fishnet links
is considered and its effect on the strength probability
distribution is analyzed on the basis of order statistics. It
appears that, with increasing size, the pdf of strength slowly
transits from Gaussian to Weilbull distribution but the transition
is different from that previously obtained at Northwestern for
quasibrittle materials of random heterogeneous mesostructure.
An important practical implication is that the staggered lamellar
architecture not only enhances the mean strength but also
contributes an additional major strength increase at the failure
probability level of 10-6, which is what matters for structural
safety.
Bio: Born and educated in Prague (Ph.D.
1963), Zdenek P. Bazant joined Northwestern
in 1969, where he has been W.P. Murphy
Professor since 1990 and, simultaneously,
McCormick Institute Professor since 2002,
and Director of Center for Geomaterials
(1981–1987). He was inducted to NAS, NAE, American
Academy of Arts and Sciences, and Royal Society of London;
to the academies of Italy, Austria, Spain, Czech Republic,
Greece and Lombardy, and Academia Europaea. He is an
received the Austrian Cross of Honor for Science and Art I.
Class; seven honorary doctorates (Prague, Karlsruhe,
Colorado, Milan, Lyon, Vienna, Ohio State); ASME Medal,
ASME Timoshenko, Nadai and Warner Medals; ASCE von
Karman, Newmark, Biot, Mindlin and Croes Medals, and
Lifetime Achievement Award; SES Prager Medal; RILEM
L'Hermite Medal; Exner Medal (Austria); Torroja Medal (Madrid);
Solin and Bazant, Sr. Medals (Prague); etc. He authored six
books: Scaling of Structural Strength, Inelastic Analysis,
Fracture and Size Effect, Stability of Structures, Concrete at
High Temperatures, and Concrete Creep. H-index: 115,
citations: 58,000 (on Google, June 2017, incl. self-cit.),
i10 index: 566. In 2015, ASCE established the ZP Bazant
Medal for Failure and Damage Prevention. He is one of the
original top 100 ISI Highly Cited Scientists in Engineering.
(www.ISIhighlycited.com).
Track 13: Micro- and Nano-Systems
Engineering and Packaging
13-2-1 MICRO- AND NANO-SYSTEMS ENGINEERING
AND PACKAGING PLENARY I
Wednesday, November 14, 9:00am–9:45am
Room 301, David L. Lawrence Convention Center
The Role of Arrayed Sensor Systems-on-Chip in Next-
Neneration MEMS Inertial Sensing
(IMECE2018-90106)
Gary K. Fedder
Abstract: Two recent projects illustrate the continued push for xliii
technological innovation to improve inertial sensor
performance, generally measured by higher dynamic range,
lower bias instability, and lower power. Bias drift compensation
by observing on-chip “auxiliary” sensors is viable when
extrinsic factors, such as ambient temperature and packaging
stress fluctuations, cause the drift. As one example, die stress
compensation, which augments temperature compensation,