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PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Xanthippi Markenscoff (University of California San Diego)
Instabilities of nucleation and growth of a phase change defect
Department of Mechanical and Aerospace Engineering
University of California San Diego
La Jolla, CA 92093-0411
Abstract
A defect of phase change in density and moduli modeled as a self-similarly expanding Eshelby ellipsoidal inclusion can nucleate and grow under a critical loading. The ellipsoid possesses the “lacuna” property with the particle velocity vanishing in the interior domain, which allows the constant stress Eshelby property and the inclusion to grow as a whole. The energetics for nucleation and growth are derived from the energy-momentum tensor and first principles. The solution obtains the flow of energies across a moving phase boundary at the balancing of which (which expresses the vanishing of the M integral) the interface presents no obstacle, and, at that critical loading, an arbitrarily small phase change defect nucleates and grows at constant potential energy. By breaking the symmetry it expands as a flattened Eshelby ellipsoidal inclusion, which minimizes the losses to move the phase boundary, and the critical pressure is obtained for nucleation and growth of an inhomogeneous inclusion under high pressure. The solution explains the generation of a shear seismic source with Double Couple radiation in deep earthquakes and the generation of failure waves with a zone of micro-fractures (in tension) under compressive loading in lima glass. The methodology has wider applications to a range of physical phenomena, such as amorphization defects and defects in alloys, planetary impacts, etc.
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Seminars (1)
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Séminaire PMMH - Vince Craig, Australian National University, Australia
Vendredi 11 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Underscreening Stable colloidal systems at very high electrolyte concentrations
In colloidal systems the range and strength of electrostatic interactions has a profound effect on a range of properties including the stability of colloidal dispersions and the phase behaviour of surfactant and polymer systems. The Debye length has proven to be a very effective measure of the range of (…)
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
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Link to cofee seminar (internal, every Thursday)
