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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 - Giuseppe Zurlo (National University of Ireland)
Manufacturing of information-rich elastic bodies through surface deposition.
In this talk I will discuss a recent theory, developed in collaboration with Lev Truskinovsky, that describes how desired distributions of residual stress can be achieved in bodies that are manufactured though the local addition of mass on their boundary [1],[2].
The source of residual stresses in elastic bodies is incompatibility of their reference configuration, that can not be isometrically embedded into the Euclidean space. A reference configuration is characterized by a metric tensor and in Euclidean solids this metric is flat. In residually stressed, ``non-Euclidean solids'' the reference metric is curved, and the associated geometrical frustration manifests itself through residual stresses.
A curved metric can be embedded into a solid by using rather well understood techniques of differential swelling, inhomogeneous thermal expansion, bulk growth and remodelling. However, geometrical frustration can also emerge as a result of surface accretion, as in tree growth, roll winding and dam construction. In our work we model surface growth through a non-holonomic approach, that allows for the incompatibility to be acquired at the moment of the creation of a new continuum particle. We then consider a general inverse problem of this type and view the deposition stress as a tensorial control parameter. We find an explicit link between the implemented deposition strategy and the resulting incompatibility. The obtained relations not only reveal the mechanisms of biological adaptation associated with surface growth, but can also guide additive manufacturing of programmable meta-materials. As an application, we discuss the possibility to manufacture arteries with a target content of residual stresses by wind rolling sheets of living cells.
[1] Z.G., Truskinovsky L., Phys. Rev. Lett. 119, 048001 (2017).
[2] Z.G., Truskinovsky L., Mech.Res.Comm., in press (2018).
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Seminars (4)
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Séminaire PMMH - Francesca Borghi Università degli Studi di Milano
Vendredi 20 juin de 11h00 à 12h00 - Salle réunion PMMH 1
REPROGRAMMABLE HARDWARE FOR DATA PROCESSING AT THE EDGE : A NEW COMPUTING PARADIGM BASED ON NEUROMORPHIC SYSTEMS
The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…) -
Séminaire PMMH - Francesca Borghi Università degli Studi di Milano
Vendredi 20 juin de 11h00 à 12h00 - Salle réunion PMMH 1
REPROGRAMMABLE HARDWARE FOR DATA PROCESSING AT THE EDGE : A NEW COMPUTING PARADIGM BASED ON NEUROMORPHIC SYSTEMS
The brain's ability to perform efficient and fault-tolerant data processing is strongly related with its peculiar interconnected adaptive architecture, based on redundant neural circuits interacting at different scales. By emulating the brain's processing and learning mechanisms, computing technologies strive to (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…) -
Séminaire PMMH - Salvatore Federico (University of Calgary, Canada)
Vendredi 4 juillet de 11h00 à 12h00 - Salle réunion PMMH 1
Continuum Mechanics of Hydrated Fibre-Reinforced Soft Tissues
Biological tissues can be represented as bi-phasic continua, with a porous solid phase saturated by an interstitial fluid and reinforced by collagen fibers. This lecture will give an overview of the modelling techniques for fibre-reinforced porous composite materials with statistical orientation of the fibers. Both (…)
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)
