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Host: Isaac Newton Institute for Mathematical Sciences
Homepage: http://www.newton.cam.ac.uk/programs/smmw02.html
Organizers: K Bhattacharya (Caltech), P Suquet (Marseille), JR Willis (Cambridge)
Description:
This Workshop forms a part of the programme Mathematical Developments in Solid Mechanics and Materials Science. It will explore the modelling of
interactions between defects at several different scales. Topics to be treated will include the modelling of single and groups of dislocations (e.g. persistent slip bands);
phenomenological theory of damage and underlying physical mechanisms; derivation of non-local macroscopic laws from micromechanics and homogenization
theory; the influence of microstructure on localization and instability, and similar topics. The objective is to advance understanding and to develop mathematical
technique to make allowance at any given scale for detail at an adjacent scale. For instance, although there is advantage in treating dislocations within the theory of
elasticity, certain effects, such as the Peierls stress, can only be understood in terms of the underlying lattice: the elastic theory thus requires augmentation by
parameters "passed up'' from the lower scale description. Conversely, events on the lower scale may be influenced by long-range interactions best described at the
higher level (macroscopic stress influencing dislocation configurations providing an example). Similar problems of interactions between scales appear at other levels.
Often, phenomenological models are postulated ab initio, or perhaps may be derived from physical assumptions coupled with thermodynamic restrictions. Some
computational schemes introduce "non-local'' terms, primarily to stabilize the numerics, though with an underlying assumption that such terms really do represent the
physics. The introduction of terms inherited from a lower scale usually introduces a characteristic length and permits the development of patterns. The Workshop will
include presentations from specialists in physical modelling, numerical computation and in mathematics, to facilitate at least a common understanding, and hopefully
the development of mathematical theory for problems associated with passing from one scale to another.
The Workshop will be structured so as to allow time for informal discussions between participants. A formal programme will be developed for the first week, but the second week will be arranged to allow as closely as possible for the special interests of participants.
Speakers: E Aifantis (Thessaloniki), M Frémond (Paris), G P Parry (Nottingham), R de Borst (Delft), G A Francfort (Paris), R Phillips (Brown), G Buttazzo (Pisa), G Friesecke (Oxford), V P Smyshlyaev (Bath), J-L Chaboche (Chatillon), H Gao (Stanford), J R Willis (Cambridge), W J Drugan (Wisconsin), A B Movchan (Liverpool, N A Fleck (Cambridge), A Needleman (Brown)
Date received: January 20, 1999
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