ULiege - Aerospace & Mechanical Engineering http://metafor.ltas.ulg.ac.be/dokuwiki/ 2026-04-10T09:22:29+00:00 http://metafor.ltas.ulg.ac.be/dokuwiki/ http://metafor.ltas.ulg.ac.be/dokuwiki/_media/logo.png text/html 2016-03-30T13:23:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://metafor.ltas.ulg.ac.be/dokuwiki/team/gdeliege/composite?rev=1459344184&do=diff Composite materials Background Carbon-Fibre-Reinforced Polymers (CFRP) are now widely used in aerospace industry thanks to their high strength-to-weight ratio. However, the numerical simulation of CFRP laminates up to failure is not trivial: laminates have anisotropic mechanical properties and laminate damage results from a combination of microscopic mechanisms (fibre brittle failure, fibre-matrix debonding, matrix ductile failure and delamination) that are not easily described at a macroscopi… text/html 2016-03-30T13:23:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://metafor.ltas.ulg.ac.be/dokuwiki/team/gdeliege/espaint?rev=1459344184&do=diff Electrostatic painting Problem description Electrostatic painting is one of the applications I studied during my PhD. I started from a mathematical model by François Henrotte [1] and used this nice coupled problem to test different potential and mixed formulations of electrostatic equations.$$ \begin{eqnarray*} \nabla\cdot\vec{d} &=& \rho_i \\ \nabla\times\vec{e} &=& 0 \\ \vec{d} &=& \varepsilon_0\vec{e} \\ \partial_t \rho_i +\nabla\cdot( \mu_i\vec{e}\rho_i) &=& 0 \end{eqnarray*}$ where $$\vec… text/html 2016-03-30T13:23:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://metafor.ltas.ulg.ac.be/dokuwiki/team/gdeliege/mems?rev=1459344184&do=diff Microelectromechanical systems Background I worked on a research project over microelectromechanical systems (MEMS) in the Aerodynamics group of Prof. Essers. This project was a collaboration between several research groups of the Université de Liège: Aerodynamics, Mechanical Vibrations (Prof. Golinval) and Applied and Computational Electromagnetics (W. Legros). My objective in this project was to simulate the deformation of microactuators taking into account the damping effect of air. These m… text/html 2016-03-30T13:23:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://metafor.ltas.ulg.ac.be/dokuwiki/team/gdeliege/nnm?rev=1459344184&do=diff Nonlinear normal modes Background Nonlinear normal modes (NNMs) are an extension of linear normal modes to nonlinear systems. This is one of the research topics of the Space Structures & Systems Lab. (Prof. Kerschen). Actually, I knew nothing of the subject until Ludovic Renson told me about it and about the nonlinear equations he wanted to solve with finite elements. The idea to be faced with an unusual set of PDEs was too much of a temptation and I decided to implement a simple case in my o… text/html 2016-03-30T13:23:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://metafor.ltas.ulg.ac.be/dokuwiki/team/gdeliege/shearo?rev=1459344184&do=diff Shearography Introduction I am no shearography expert, so I will quote J.-F. Vandenrijt [1] for a proper definition: Shearography records the interference pattern between a speckle object wavefront and itself laterally displaced through an optical shearing device. Such interference patterns, so-called shearograms, are recorded at different instants between which the inspected object undergoes a certain stress (thermal, mechanical, pressure variation, vibration). The numerical difference betwee…