Christelle Combescure

Christelle Combescure
Université Bretagne Sud | UBS · IRDL – Institut de Recherche Dupuy de Lôme

PhD
Associate Professor at Académie Militaire de Saint Cyr Coëtquidan and IRDL.

About

24
Publications
6,752
Reads
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102
Citations
Introduction
Researcher in mechanical and civil engineering, I'm interested in discovering and developing powerful and efficient tools for the study of complex materials with internal microstructure such as cellular, hierarchical or meta materials. A good understanding and prediction of the behavior of these new material is of crucial interest for the safety of people and infrastructure using them. My work aims at improving theoretical and numerical models of such materials through theoretical developments.
Additional affiliations
September 2020 - present
Ecoles de Saint Cyr Coëtquidan
Position
  • Maître de Conférences
September 2020 - present
Université Bretagne Sud
Position
  • Chercheure associée
September 2017 - September 2020
Université Gustave Eiffel
Position
  • Maître de Conférences
Education
October 2010 - October 2013
Sorbonne Université
Field of study
  • Civil Engineering and Mechanics
September 2007 - September 2010
Ecole normale supérieure de Cachan
Field of study
  • Civil Engineering and Mechanics

Publications

Publications (24)
Preprint
Full-text available
We present a general approach to the bifurcation analysis of elastic frameworks with symmetry. While group-theoretic methods for bifurcation problems with symmetry are well known, their actual implementation in the context of elastic frameworks is not straightforward. We consider frames comprising assemblages of Cosserat rods, and the main difficul...
Article
Full-text available
A phase field model for anisotropic, elastoplastic fracture model in layered structures obtained by 3D printing processes is proposed. An extension of anisotropic phase field to elastoplasticity model is developed. The model is able to describe a transition from quasi-brittle to elastoplastic fracture behaviors depending on the angle of layers in t...
Article
Full-text available
In this work we investigate the properties of elastic waves propagating in gyroid lattices. First, we rigorously characterize the lattice from the point of view of crystallography. Second, we use Bloch–Floquet analysis to compute the dispersion relations for elastic waves. The results for very long wavelengths are then compared to those given by cl...
Preprint
Full-text available
In this work we investigate the properties of elastic waves propagating in gyroid lattices. First, we rigorously characterize the lattice from the point of view of crystallography. Second, we use Bloch-Floquet analysis to compute the dispersion relations for elastic waves. The results for very long wavelengths are then compared to those given by cl...
Article
The mechanics of cellular honeycombs—part of the rapidly growing field of architected materials—in addition to its importance for engineering applications has a great theoretical interest due to the complex bifurcation mechanisms leading to failure in these nonlinear structures of high initial symmetry. Of particular interest to this work are the d...
Article
Full-text available
An extension of the phase field method to model interfacial damage in elastoplastic composites is proposed. In the matrix, an elastoplastic phase field is employed to model the fracture process. To introduce interfacial damage between inclusions and the matrix, a strain density function depending on the jump due to decohesion is added to the total...
Article
Full-text available
The present paper proposes a new efficient and robust algorithm for evaluating the loss of ellipticity criterion. While commonly used in 2D models for thin metal sheet forming processes, it is rarely evaluated in 3D structures due to the computational cost. The proposed algorithm is based on a Newton‐Raphson scheme and a multi‐sampling optimization...
Article
This paper explores the importance of nonlinear material properties in the design of hierarchical honeycomb materials. The recent literature on the design and optimization of linear material properties for hierarchical honeycombs is reviewed. Then a full nonlinear post-bifurcation numerical analysis is performed for five representative hierarchical...
Article
The buckling and crushing mechanics of cellular honeycomb materials is an important engineering problem. Motivated by the pioneering experimental and numerical studies of Papka and Kyriakides (1994, 1999a,b), we review the literature on finitely strained honeycombs subjected to in-plane loading and identify two open questions: (i) How does the mech...
Article
A new stress resultant nonlinear dissipative constitutive model for reinforced concrete (RC) plates under cyclic solicitations is presented. This constitutive model, named DHRC for Dissipative Homogenised Reinforced Concrete, is expressed within the usual thin plate kinematics framework. It is built by a periodic homogenisation approach using the a...
Conference Paper
Full-text available
Recent advances in materials processing have lead to the creation of new classes of materials: hybrid and architectured materials. These materials, defined by a controlled periodic microstructure, are created in a ’Material-by-Design’ approach where a desired material is created through optimization with respect to performance or multifunctional pr...
Conference Paper
Full-text available
Les matériaux à microstructure régulière tels que les matériaux architecturés présentent un grand nombre de symétries géométriques internes et leur comportement à la ruine peut ainsi devenir com-pliqué à étudier du fait d'instabilités multiples pouvant subvenir simultanément. Les techniques usuelles d'étude de la bifurcation comprennent alors un ri...
Conference Paper
Full-text available
he post-bifurcation behavior of infinite hierarchal honeycomb structures is investigated using equivariant bifurcation theory and the group representation theory of space groups. A custom computational branch-following and bifurcation (BFB) code coupled with a finite element code (FEAP) is used to numerically explore a number of examples. First, a...
Article
A new stress resultant constitutive model for reinforced concrete plates under cyclic solicitations is presented. This model is built by the periodic homogenisation approach using the averaging method and couples damage of concrete and periodic debonding between concrete and steel rebar. In one-dimensional situations, we derive a closed-form soluti...
Thesis
Full-text available
Safety reassessments are periodically performed on the EDF nuclear power plants and the recent seismic reassessments leaded to the necessity of taking into account the non-linear behaviour of materials when modeling and simulating industrial structures of these power plants under seismic solicitations. A large proportion of these infrastructures is...
Conference Paper
Full-text available
11e Colloque National en Calcul des Structures 13-17 Mai 2013 1 Modèle DHRC de comportement non linéaire de plaques en béton armé sous sollicitations sismiques. Résumé — Un nouveau modèle de comportement, appelé « Dissipative Homogenized Reinforced Concrete (DHRC) model », pour les plaques en béton armé sous sollicitations sismiques est présenté. C...
Conference Paper
Full-text available
Inauguration Institut SEISM– 19 Déc. 2012 « Modélisation performante et réaliste en dynamique non linéaire des structures en béton armé »
Conference Paper
Full-text available
This paper presents the construction of a global model of reinforced concrete plates dedicated to structures (slabs, walls…) subjected to low and moderate seismic solicitations, formulated according to the Generalized Standard Materials theory [5]. Regarding the context imposed by the applications considered one can identify three main objectives:...
Conference Paper
Full-text available
RÉSUMÉ. Pour modéliser la tenue sismique de bâtiments en béton armé, on propose un modèle de comportement macroscopique d’endommagement pour le béton armé formulé sur des éléments plaques, dans le cadre standard généralisé ; on évite de représenter les phases adoucissantes liées à la dégradation du béton, en profitant de la contribution des armatur...

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Projects

Projects (4)
Project
Study the role of symmetries (or the lack of) in materials and structures and how we could take advantage of it to design systems with exotic or advantageous mechanical or multi-physical properties.
Project
The MAJOR project proposes to study the influence of the shape of the joint in lattices coming from additive manufacturing processes on the failure modes of these materials. The goal is to come up with representative, trustworthy, simplified models for large scale simulations on complex structures. Theoretical and numerical predictions are based on instability analysis and crack propagation models. A comparison with experimental results is foreseen.
Project
Predicting possible microscopic or macroscopic instabilities in architected materials and the post-bifurcation behavior in an automated and exhaustive way