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BEGIN:VEVENT

CATEGORIES:Lectures/Conferences
CATEGORIES:Other
CATEGORIES:Utilities
CATEGORIES:Panel/Seminar/Colloquium
CATEGORIES:Competition/Contest
CATEGORIES:Main
CONTACT;X-BEDEWORK-UID=8a0183a7-83184018-0184-87170e31-00006277:Hinz\, Nic
 olle
CREATED:20241008T160116Z
DESCRIPTION:Liquid crystal elastomers (LCEs) are a fascinating class of ma
 terials that display soft and semi-soft elastic behavior as well as a les
 s explored viscoelastic behavior.  These materials are composed of liquid
  crystal molecules and polymerizing agents to form a solid that behaves a
 s an elastomer but also like a liquid crystal.  The interaction of these 
 two features provides for a wide and complex range of macroscopically obs
 erved phenomena\, including for example optical actuation\, extreme softn
 ess\, pattern formation\, and high damping to name a few. In this talk\, 
 I will present a general introduction to the physics of these unique mate
 rials at a microscopic as well as macroscopic scale.This will lead to ins
 ights into the long-standing well-established models that are used to und
 erstand their elastic behavior. Consideration will also be given to model
 s that can account for time-dependent\, i.e.\, viscoelastic\, behavior - 
 an aspect that is not well examined in the literature - as well as comput
 ational considerations.\nIn the presentation\, I will mainly consider so-
 called mono-domain liquid crystal elastomers that possess both a viscous 
 director response as well as a viscoelastic elastomeric network response.
  The modeling framework will be built from the continuum scale\, utilizin
 g the formal principles of invariance of expended power to develop the go
 verning balance laws for such materials accounting for loads that can imp
 ose twist directly at the continuum level.  This framework is combined wi
 th free-energy dissipation arguments to generate restrictions on the poss
 ible constitutive relations for LCEs based upon hypothesized functional d
 ependencies of the free-energy function.This mathematical framework leads
  to natural choices for evolution laws governing the viscous kinematics t
 hat have an appealing and intuitive nature. We demonstrate the utility of
  the model by considering its capabilities in comparison to experimental 
 data\, while also learning some cautionary information about the applicat
 ion of such materials in engineering practice.
DURATION:PT1H
DTSTAMP:20241008T160116Z
DTSTART;TZID=America/New_York:20241014T103000
LAST-MODIFIED:20241008T160116Z
LOCATION;X-BEDEWORK-UID=18832edc-1b287efb-011b-2c10ff6a-00000003:Teer 203
STATUS:CONFIRMED
SUMMARY:Physics and Models for Liquid Crystal Elastomers
UID:CAL-8a00048d-91324965-0192-6cdd050e-0000587cdemobedework@mysite.edu
URL:https://cee.duke.edu/about/awards-honors/melosh-medal
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Main:/user/public-user/Utili
 ties/Main
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Panel_Seminar_Colloquium:/us
 er/public-user/Lectures_Conferences/Panel_Seminar_Colloquium
X-BEDEWORK-ALIAS;X-BEDEWORK-PARAM-DISPLAYNAME=Competition_Contest:/user/pu
 blic-user/Other/Competition_Contest
X-BEDEWORK-SPEAKER:Dr. Sanjay Govindjee\, UC Berkeley\, Horace\, Dorothy\,
  and Katherine Johnson\, Professor in Engineering
X-BEDEWORK-DUKE-SERIES:35th ANNUAL  ROBERT J. MELOSH MEDAL COMPETITION FOR
  THE BEST STUDENT PAPER ON COMPUTATIONAL MECHANICS
X-BEDEWORK-SUBMITTEDBY:nh143 for Civil and Environmental Engineering (CEE)
  (agrp_PrattSchool_CEE)
END:VEVENT
END:VCALENDAR