DSM : Thesis SL-DSM-14-0210

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Research field

Solid state physics, surfaces and interfaces / Solid state physics, chemistry and nanosciences
Mechanics, energetics, process engineering / Engineering science

Title

Physical aspects of quasibrittle fracture: how to predict (micro)damaging in heterogeneous solids

Abstract

Being able to predict the where, the when and the how of material failure is of uttermost importance in many fields, from civil engineering to material science, from wear assessment to seismology. This is not an easy task: Ceramics, composites, rocks, mortar, and more generally the so-called quasi-brittle materials indeed start by accumulating diffuse damage through barely perceptible microfracturing events before collapsing abruptly, without much warning. This translates into non-trivial size-dependencies and statistical aspects, which makes difficult the assessment and control of mechanical durability in many nano-components, and, at much larger scale, the mitigation of earthquakes hazards.



The PhD topic we propose here lies within this context. Recent concepts and methods issued from statistical and non-linear physics were found to be promising and (may) allow predicting statistically, or even deterministically, the occurrence of microfracturing events and the subsequent breakdown of quasibrittle solids. Still, these developments remain theoretical and numerical, confined to very simple situations far from the real materials of engineering interests. Hence, we propose to develop highly controlled fracture experiments on model transparent materials with tuneable microstructure in order (i) to image in real time microfracturing events and (ii) to characterize the multiscale processes that drive their self-organization up to ultimate failure. These experiments will permit to fill the gap between the theoretical approaches on one hand, and the real materials of engineering and geological interest on the other hand.



This Ph.D. thesis takes place astride Statistical Physics, Continuum Mechanics and Materials Science. The candidate will have the opportunity to use, - and to familiarize himself with -, both the theoretical and experimental techniques developed in these three fields.

Location

Institut rayonnement et matière de Saclay
Service de Physique de l'Etat Condensé
Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes
Centre : Saclay
Starting date : 01/10/2013

Contact person

Daniel BONAMY
CEA / DSM/IRAMIS/SPEC/SPHYNX
DSM/IRAMIS/SPEC/SPHYNX

CEA Saclay

Bat.462 Pce 17

91191 Gif-Sur-Yvette Cedex

FRANCE
Phone : 01 69 08 21 14

More about

http://iramis.cea.fr/Pisp/2/daniel.bonamy.html
http://iramis.cea.fr/spcsi/Phoce...groupe.php?id_unit=8&id_groupe=1468

University / Graduate School

Ecole Polytechnique
Ecole Doctorale de l'Ecole Polytechnique - Ecole Polytechnique -

Thesis supervisor

Daniel BONAMY
CEA / DSM/IRAMIS/SPEC/SPHYNX
DSM/IRAMIS/SPEC/SPHYNX

CEA Saclay

Bat.462 Pce 17

91191 Gif-Sur-Yvette Cedex

FRANCE


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