Cemented granular materials play an important role in both natural and engineered structures, as they are able to resist traction forces. However, modeling the mechanical behavior of such materials is still challenging, and most of existing constitutive models follow phenomenological approaches that unavoidably disregard the microstructural mechani...
We investigated the effective influence of grain structures on the heat transfer between a fluid and solid domain using mathematical homogenization. The presented model consists of heat equations inside the different domains, coupled through either perfect or imperfect thermal contact. The size and the period of the grains are of order $\varepsilon...
Purpose: From the myofibrils to the whole muscle scale, muscle micro-constituents exhibit passive and active mechanical properties, potentially coupled to electrical, chemical, and thermal properties. Experimental characterization of some of these properties is currently not available for all muscle constituents. Multiscale multiphysics models have...
Ferromagnetic materials show magnetic structures with domains and walls. Thanks to decades of research regarding the origin and behaviour of magnetic domains, we now possess a general foundation which has been verified experimentally in single crystals and powders. The governing equations at the microscopic scale were built in the 1960 s when Brown...
A manufacturing process consists of the deposit of thin films at different temperatures which produce in-plane stress loading. The presence of these mechanical stresses in different layers induces deformation of thewafer. In this sense, wafer warpage usually occurs which can cause unexpected large and critical deformations of the structure, includi...
Les matériaux et structures hétérogènes, tels que les bobines, tôles laminées et composites magnétiques doux (SMC), sont répandus en génie électrique. Ils ont la caractéristique d'être constitués de nombreux éléments plus petits que la taille de l'ensemble, rendant leur simulation numérique difficile.Cette thèse étudie les méthodes multi-échelles d...
Published in Science and Technology for Energy Transition
In this work we focus on further understanding reactive transport in carbonate rocks, in particular limestones characterized by a bimodal pore size distribution. To this end, we performed injection experiments with CO2-saturated water on a sample of Euville limestone and monitored the experiments with a medical CT scanner. Microscanner imaging was ...
Mérope is a software devoted to the geometrical design and the discretization of microstructures of random heterogeneous materials. Mérope aims at building large samples of microstructured materials, called Representative Volume Elements, in order to derive their effective physical behaviors. Various microstructures are supported: spherical, polyhe...
Published in Mechanics & Industry
In this paper, a new approach to design ultralight structures is developed based on a previous work called Efficient Multiscale Topology Optimization. A parameterized (or explicit) truss-based cell is introduced to generate intrinsically well-connected microstructures and to get clear interpretable optimal multiscale structures. The method uses a p...
This Work focuses on the accurate and efficient modeling of polymer materials. In a first step, the large strain hyperelastic phenomenological constitutive model proposed by V.D. Nguyen et al. for the modeling of highly nonlinear, rate-dependent amorphous glassy polymers at isothermal conditions is enhanced with the introduction of new strain depen...
