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SUMMARY:Deformation of Plastically Compressible Hardening-Softening-Harden
 ing Solids
DTSTART:20120514T150000
DTEND:20120514T160000
DTSTAMP:20260427T231127Z
UID:ddd7222570260cf614accd38aa66a998e54f9b1ba71d674b0273b10c
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Alan Needleman\, University of North Texas\, USA\nCalcul
 ations have shown that a phenomenological elastic-viscoplastic constitutiv
 e relation that allows for plastic compressibility can give rise to a prog
 ressive buckling-type mode of deformation as seen in experiments on vertic
 ally aligned carbon nanotube (VACNT) pillars although a more common respon
 se with such a constitutive relation is a propagating instability. A pheno
 menological constitutive relation that can give rise to this deformation m
 ode is discussed. This constitutive relation is used in 2D and 3D finite d
 eformation\, finite element analyses to model the response of compressible
  hardening-softening-hardening solids under various imposed loadings\, inc
 luding uniaxial compression\, uniaxial tension and indentation. The effect
  of material parameter variations on the mechanical response and the type 
 of instabilities that emerge is considered. Both numerical issues and the 
 issue of extracting material properties from measurements of overall loads
  and deformations are discussed. The responses of hardening-softening-hard
 ening solids are compared with the corresponding responses of non-softenin
 g solids as well as with the phenomenology seen in experiments. This is jo
 int work with Shelby Hutchens\, Nisha Mohan and Professor Julia Greer of C
 altech.
LOCATION:ME B3 31 http://plan.epfl.ch/?room=me%20b3%2031&lang=en
STATUS:CONFIRMED
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