ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Sylvain Patinet
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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Recent seminars (8)
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Séminaire PMMH – Joseph Ackerman (Lab. Jean Perrin, Sorbonne Université)
Vendredi 20 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Joseph Ackerman (Lab. Jean Perrin, Sorbonne Université)
Vendredi 20 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH - Hughes Chaté (CEA Saclay)
Vendredi 13 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
Modeling suspensions of swarming bacteria with wet Vicsek models
Hugues Chaté SPEC, CEA - Saclay & Beijing CSRC, China After a brief introduction to active matter and some remarks about the development of the field, I will first focus on aligning dry active matter, and in particular on Vicsek-style models, the emblematic models in this class. In a second part, I will show that (...) -
Séminaire PMMH - Xanthippi Markenscoff (University of California San Diego)
Vendredi 6 décembre de 11h00 à 12h00 - Salle réunion PMMH 1
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 (...) -
Séminaire PMMH - Denis Dumont (IUSTI Marseille)
Vendredi 29 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
Rheology of sticky grains
In many powder technology processes, coating is applied to fine particles to control their properties or functionalize them. We investigated the role of a polymer coating made of PBS on silica beads. This material has been originally designed as a model cohesive granular material, whose cohesion can be finely (...) -
Séminaire PMMH – Scott Waitukaitis (IST Austria)
Vendredi 22 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH – Scott Waitukaitis (IST Austria)
Vendredi 22 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
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Séminaire PMMH - Hannah Allen (LSCE, CEA Saclay)
Vendredi 15 novembre de 11h00 à 12h00 - Salle réunion PMMH 1
Monitoring atmospheric fossil fuel emissions using radiocarbon and global atmospheric simulations with a transport and inverse modeling system
Independent monitoring and apportioning of CO2 emissions is crucial for the verification of greenhouse gas reductions targeted by international agreements designed for climate change mitigation and adaptation. Radiocarbon (14C), found as a fractional isotope of CO2, can be used as a key tracer for fossil-derived (...)
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.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
