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Person# Guillaume Anciaux

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Dislocation

In materials science, a dislocation or Taylor's dislocation is a linear crystallographic defect or irregularity within a crystal structure that contains an abrupt change in the arrangement of atoms.

Friction

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction:
*Dry friction is a force

Molecular dynamics

Molecular dynamics (MD) is a computer simulation method for analyzing the physical movements of atoms and molecules. The atoms and molecules are allowed to interact for a fixed period of time, giv

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CIVIL-321: Numerical modelling of solids and structures

La modélisation numérique des solides est abordée à travers la méthode des éléments finis. Les aspects purement analytiques sont d'abord présentés, puis les moyens d'interpolation, d'intégration et de résolution de la mécanique sont étudiés.

MATH-458: Programming concepts in scientific computing

The aim of this course is to provide the background in scientific computing. The class includes a brief introduction to basic programming in c++, it then focus on object oriented programming and c++ specific programming techniques.

MATH-611: Scientific programming for Engineers

The students will acquire a solid knowledge on the processes necessary to design, write and use scientific software. Software design techniques will be used to program a multi-usage particles code, aiming at providing the link between algorithmic/complexity, optimization and program designs.

Guillaume Anciaux, Antonio Joaquin Garcia Suarez, Jean-François Molinari, Manon Eugénie Voisin--Leprince

We discuss the multiscale modeling of a granular material trapped between continuum elastic domains. The amorphous granular region, usually termed “gouge,” is under high confinement pressure, to represent the loading of faults at depth. We model the granularity of gouge using the discrete element method (DEM), while the elastic regions surrounding it are represented with two continuum domains modeled with the finite element method (FEM). We resort to a concurrent coupling of the discrete and continuum domains for a proper transmission of waves between the discrete and continuum domains. The confinement pressure results in the appearance of a new kind of ghost forces, which we address via two different overlapping coupling strategies. The first one is a generalization to granular materials of the bridging method, which was originally introduced to couple continuum domains to regular atomic lattices. This method imposes a strong formulation for the Lagrange constraints at the coupling interface. The second strategy considers a weak formulation. Different DEM samples sizes are tested in order to determine at which scale a convergence of the elastic properties is reached. This scale sets the minimal mesh element size in the DEM/FEM interface necessary to avoid undesirable effects due to an elastic properties mismatch. Then, the two DEM/FEM strategies are compared for a system initially at equilibrium. While the performance of both strategies is adequate, we show that the strong coupling is the most stable one as it generates the least spurious numerical noise. Finally, as a practical example for the strong coupling approach, we analyze the propagation of pressure and shear waves through the FEM/DEM interface and discuss dispersion as function of the incoming wave frequency.

2022,

The capture system developed for the ADRIOS project is presented. The mechanical simulator as well as the control engine are presented.

2022Guillaume Anciaux, Mohit Pundir

In concrete structures, opened cracks contribute significantly to the transfer of shear and normal stresses through the contact forces acting on fractured surfaces. Such contact forces are due to protruding asperities, engaged by interlocking and friction during mixed-mode displacements. The presented work first presents micro-CT and digital microscope measures of concrete surfaces which were previously sheared until failure. This allows to link the features of cracked concrete surfaces with the distribution of aggregates - induced by the cumulative density function and the radial distribution function - and with a small scale roughness coming from much smaller grains (mortar and broken aggregates) which can be acknowledged with statistical indicators such as the Hurst exponent and the root-mean-square of surface slopes. This experimental data lead to an accurate numerical surface generator which superposes of a fractal-like roughness with a set of protruding aggregates. Then, the role played by such a roughness on shear resistance is investigated numerically, thanks to a contact solver based on a boundary integral approach. With an extremely fine description of cracked surfaces (four million discretization points), we demonstrate that roughness impacts drastically the shear resistance. The small scale roughness induces a non-monotonic evolution of the true contact area, which first increases before decaying as a power-law, which is intimately linked with the fine scale roughness self-affinity. A remarkable outcome of our approach is a better agreement with the seminal experimental results of Jacobsen. We finally propose a semi-empirical traction-separation law for cracked concrete, which accounts for micro-scale roughness and aggregate distribution. This law is directly usable in finite element simulations employing a cohesive element modeling of cracks, and naturally includes roughness-induced interlocking effect.

2022