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Peer Reviewed
See detailModelling of speleothems failure in the Hotton cave (Belgium). Is the failure earthquake induced?
Cadorin, Jean-François; Jongmans, Denis; Camelbeeck, Thierry et al

in Netherlands Journal of Geosciences - Geologie en Mijnbouw (2001), 80(3-4), 315-321

To provide quantitative information on the ground acceleration necessary to break speleothems, laboratory measurements on samples of stalagmite have been performed to study their failure in bending. Due ... [more ▼]

To provide quantitative information on the ground acceleration necessary to break speleothems, laboratory measurements on samples of stalagmite have been performed to study their failure in bending. Due to their high natural frequencies, speleothems can be considered as rigid bodies to seismic strong ground motion. Using this simple hypothesis and the determined mechanical properties (a minimum value of 0.4 MPa for the tensile failure stress has been considered), modelling indicates that horizontal acceleration ranging from 0.3 m/s(2) to 100 m/s(2) (0.03 to 10g) are necessary to break 35 broken speleothems of the Hotton cave for which the geometrical parameters have been determined. Thus, at the present time, a strong discrepancy exists between the peak accelerations observed during earthquakes and most of the calculated values necessary to break speleothems. One of the future research efforts will be to understand the reasons of the defined behaviour. It appears fundamental to perform measurements on in situ speleothems. [less ▲]

Detailed reference viewed: 67 (10 ULg)
See detailModelling of STAP signals for monostatic configurations
Verly, Jacques ULg

Scientific conference (2003)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailModelling of Strain Localisation: Mesh Enrichment with Spectral Overlay or with Interface Elements.
Charlier, Robert ULg; Wang, X. C.; Pierry, J.

in Proc. of the Europ-US Workshop on Fracture and Damage in Quasi Brittle Structures (1994, September)

Detailed reference viewed: 2 (0 ULg)
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See detailModelling of the behaviour of a thin-walled channel cross section, using beam finite elements
Degée, Hervé ULg

in Proceedings of the Third International Conference on Thin-Walled Structures (2001)

This paper aims at presenting an approach allowing studying the behaviour of channel profiles through the use of beam finite elements. This approach can be considered as an interesting alternative to the ... [more ▼]

This paper aims at presenting an approach allowing studying the behaviour of channel profiles through the use of beam finite elements. This approach can be considered as an interesting alternative to the use of plate finite elements, for the modelling of structures made of thin-walled members. The main idea consists in superimposing on a classical beam global displacement field, a local field describing the deformation of the profile cross-section, when a local buckling or a distortional buckling occurs. In a first step, the behaviour of the constitutive walls of a profile is studied. These walls are there considered as single plates. Two main classes of walls are studied (internal walls, such as web, and free edge walls, such as flanges). Different kinds of stress state are also considered, in order to be able to model the behaviour under compression and/or bending. In a second step, these isolated wall models are assembled in order to build up a channel section profile. The approach is applied to the computation of critical buckling load under compression and in-plane bending. [less ▲]

Detailed reference viewed: 32 (2 ULg)
See detailModelling of the behaviour of column web panels in semi-rigid joints
Maquoi, René ULg; Jaspart, Jean-Pierre ULg

in Miscellany dedicated to the 65th birthday of Academician Professor Dr. Nikola HAJDIN (1988)

Detailed reference viewed: 14 (0 ULg)
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See detailModelling of the climate influence on the Black Grouse population dynamics in Europe
Loneux, Michèle ULg

in Cahiers d'Ethologie (2000), 20(2-3-4), 191-2162001

Detailed reference viewed: 7 (1 ULg)
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See detailModelling of the convective drying of resorcinol-formaldehyde resins: influence of the drying conditions on the induces stress tensor
Léonard, Angélique ULg; Crine, Michel ULg; Jomaa, Wahbi

in Farkas, Istvan (Ed.) Drying 2006, the Proceedings of the 15th International Drying Symposium,Budapest, Hungary, 20-23 August 2006, Vol. A (2006, August)

Detailed reference viewed: 13 (0 ULg)
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See detailModelling of the cooling of steel pieces
Habraken, Anne ULg; Bourdouxhe, M.

in Wrobel; Brebbia; Nowak (Eds.) Advanced Computational Method in Heat Transfer, Vol. 3 - Phase Change and Combustion simulation. Proceedings of the First International Conference (1990)

Detailed reference viewed: 6 (3 ULg)
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See detailModelling of the Excavation Damaged Zone in Opalinus Clay
Levasseur, Séverine ULg; Collin, Frédéric ULg; Charlier, Robert ULg

in Post-TIMODAZ International Workshop THM effects in clay host rocks for radioactive waste repositories (2012)

Detailed reference viewed: 16 (3 ULg)
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See detailModelling of the liquid distribution in a trickle flow packed column based upon X-ray tomography images
Toye, Dominique ULg; Marchot, Pierre ULg; Crine, Michel ULg et al

in Chemical Engineering Communications (1999), 175

X-ray tomography is used to characterise the liquid distribution in a 0.6 meter diameter and 2 meter height column filled with gas-liquid absorption polypropylene packing elements (Cascade Mini-Ring 1A ... [more ▼]

X-ray tomography is used to characterise the liquid distribution in a 0.6 meter diameter and 2 meter height column filled with gas-liquid absorption polypropylene packing elements (Cascade Mini-Ring 1A, Glitsch Benelux). The liquid holdup distribution is determined for liquid flowrates ranging from 1000 l/h to 6000 l/h, that correspond to superficial velocities ranging from 10(-3) to 6 10(-3) m/s, in several cross sections situated at different heights in the packed column. A characteristic length, corresponding to the smallest scale beyond which the packing properties may be supposed statistically homogenous and isotropic, as determined by Means of the autocorrelation function method applied to the images of the solid distribution. Both local and global liquid holdup measurements are satisfactorily modelled by means of a partial wetting model based on a probabilistic approach. [less ▲]

Detailed reference viewed: 21 (3 ULg)
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See detailModelling of the Marine Carbon Cycle
Munhoven, Guy ULg

Scientific conference (2012, October 17)

The lecture is subdivided into two parts. The first one deals with the essence of modelling, with the main principles and stages of development. The procedure of model development will be exemplified on ... [more ▼]

The lecture is subdivided into two parts. The first one deals with the essence of modelling, with the main principles and stages of development. The procedure of model development will be exemplified on the basis of a practical question. During this first part, a number of concepts and parameters that are important for the particular case of ocean carbon cycle modelling are already introduced. In the second part, we further deepen these. We explore the main physical and biogeochemical processes that are important to understand how the carbon cycle operates in the world ocean and provide insight into the way they are represented in different types of models currently used. [less ▲]

Detailed reference viewed: 38 (2 ULg)
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See detailModelling of the micro-mechanical behaviour of steel sheets during deep-drawing
Duchene, Laurent ULg; Godinas, A.; Habraken, Anne ULg et al

in Duflou, J. R.; Geiger, M.; Kals, H. J. J. (Eds.) et al Proceedings of the 9th International Conference on Sheet Metal (2001)

This abstract presents a constitutive law based on Taylor's model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation ... [more ▼]

This abstract presents a constitutive law based on Taylor's model implemented in our non-linear finite element code LAGAMINE. The yield locus is only locally described and a particular interpolation method has been developed. This local yield locus model uses a discrete representation of the material's texture. The interpolation method is presented and a deep-drawing application is simulated in order to show up the influence of the texture evolution during forming processes. [less ▲]

Detailed reference viewed: 17 (4 ULg)
Peer Reviewed
See detailModelling of the North-West African Upwelling
Elmoussaoui, Abdellali; Djenidi, Salim ULg; Kostianoy, Andrey

in Proceedings of the International Conference "Physical processes on the ocean shelf" (1996)

Detailed reference viewed: 5 (0 ULg)
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See detailModelling of the squeeze film air damping in MEMS
Barroso, Juan José Gómez; Bruls, Olivier ULg; Berli, Claudio et al

in Proceedings of the ENIEF Conference (2009)

We propose a formulation for modeling the squeeze film air damping in micro-plates typical of micro-electromechanical devices for micro switch applications. A special finite element is developed, in which ... [more ▼]

We propose a formulation for modeling the squeeze film air damping in micro-plates typical of micro-electromechanical devices for micro switch applications. A special finite element is developed, in which the nonlinear Reynolds equation for compressible film is used to analyze the air pressure field, whereas a standard linear elastic model is used for the displacement field. The formulation is based on a finite element discretization of both the pressure and displacement fields. The coupled equations of motion are established and, for harmonic oscillations, we show that the resulting damping matrix depends on the frequency. The typical dimensions and properties of the MEMS device are in the order of hundred micrometers length and some micrometers (3-8 micrometers) thick, with a separation from the substrate of also some micrometers (e.g. 3-5 micrometers). For these dimensions, the influence of damping owing to the surrounding air cannot be neglected, having an important contribution to the quality factor of the device. The influence of plate holes, which are necessary because of the fabrication process, determines also the dynamic behavior of the plate. Examples are presented, with comparisons to results of the bibliography. [less ▲]

Detailed reference viewed: 69 (2 ULg)
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See detailModelling of the squeeze film air damping in MEMS
Bruls, Olivier ULg

Report (2008)

This document proposes a formulation of the squeeze film air damping in micro-plates. The nonlinear Reynolds equation for compressible film is used to analyze the air pressure field, whereas a standard ... [more ▼]

This document proposes a formulation of the squeeze film air damping in micro-plates. The nonlinear Reynolds equation for compressible film is used to analyze the air pressure field, whereas a standard linear elastic model is used for the displacement field. The formulation is based on a finite element discretization of both the pressure and displacement fields. The coupled equations of motion are established and, for harmonic oscillations, we show that the resulting damping matrix depends on the frequency. [less ▲]

Detailed reference viewed: 31 (4 ULg)