NEWS (7)
CM | 22/02/2018

Symposium Organizers: Craig Maloney & M. Carmen Miguel

October 10-12, 2018, Leganés, Madrid (Spain)

This symposium will bring together researchers working on experiments, theory, and numerical simulation from across disciplines including theoretical mechanics, statistical mechanics, and materials science on a variety of material systems where the randomness and the statistical distribution of local properties gove rns the macroscopic response. The systems of interest include: Glasses; Granular materials; Soft glassy material (foams, suspensions, emulsions) ; Elastic networks ( hydrogels, bio-polymer networks ), Crystal plasticity (dislocation lines moving through a field of obstacles), Random quasi-brittle fracture in materials and at the geological scale. In many of these systems, understanding the rare configura tions in the tales of the statistical distributions, usually near a mechanical threshold, are key to understanding the macroscopic response. For example: i) the elastic properties of weakly cross-linked networks and gels are dominated by relatively few disordered vibrational low frequency eigenmodes, ii) the visco-plastic response of amorphous materials is governed by the few weak zones in the material which undergo plastic rearrangement, iii) size-strength relationships in random quasi-brittle fracture can be understood in terms of extreme value statistics. Relating these rare states to the macroscopic response is the key issue to be addressed .
CM | 21/02/2018

The program will run from 30 April - 11 May 2018

Coordinators: Lasse Laurson, Joachim Matthiesen, Stephane Santucci

Numerous systems including deformation and fracture of materials, dynamics of domain walls in ferromagnets, and earthquakes respond to slow and smooth external driving by exhibiting intermittent and bursty dynamics, or crackling noise, consisting of a sequence of events with a broad size distribution. A major challenge we aim to address within this program is that in many cases, the relevant empirical and experimental phenomena remain unexplained by theory. To this end, we plan to bring together experts of various fields where crackling noise is observed,including contributions from theory, numerical simulations and experiment, to present an overview of the current developments, and to discuss open problems of the field.

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