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SUMMARY:A phenomenological constitutive theory for polycrystalline ferroel
 ectric ceramics based on orientation distribution functions - Dr Martin I.
  Idiart\, Departamento de Aeronáutica\, Facultad de Ingeniería\, Univers
 idad Nacional de La Plata / CONICET\, Argentina
DTSTART:20200210T140000Z
DTEND:20200210T150000Z
UID:TALK134983@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:A phenomenological constitutive theory for the ferro-electro-e
 lastic response of polycrystalline ceramics with tetragonal perovskite str
 ucture is proposed. The state of a material point is characterized by an i
 ntrinsic polarization vector\, an infinitesimal deformation tensor\, and a
 n internal variable representing the orientation distribution of c-axes of
  the ferroelectric domains at that point. A class of convex thermodynamic 
 potentials in terms of these state variables is posited\, and constitutive
  relations within the framework of generalized standard materials are then
  derived. The functional form of the dissipation is selected in such a way
  that it effects an order reduction of the constitutive description whereb
 y the infinite-dimensional internal variable is reduced to finite-dimensio
 nal internal variables representing polarization and deformation due to fe
 rroelectric switching\, preserving at the same time the generalized standa
 rd structure of the theory. The resulting constitutive theory is able to r
 eproduce most essential features of ferroelectric and ferroelastic behavio
 r with minimal computational cost and\, furthermore\, generates stable pre
 dictions in contrast to current phenomenological theories in common use.
LOCATION:Oatley Seminar Room\, Department of Engineering
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