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See detailFinite Element Model Updating of the Garteur SM-AG19 Structure
Thonon, Carole; Golinval, Jean-Claude ULg

Conference given outside the academic context (2001)

This paper reports the procedure followed by the "LTAS-Vibrations et Identification des Structures" research group to generate a low order nite element (F.E.) model of the GARTEUR SM-AG19 structure ... [more ▼]

This paper reports the procedure followed by the "LTAS-Vibrations et Identification des Structures" research group to generate a low order nite element (F.E.) model of the GARTEUR SM-AG19 structure proposed as benchmark in the framework of the European COST Action F3 in structural dynamics. The model is made of beam elements, local inertia and rigid body elements. First, the correlation of the experimental data with the results of the F.E. model shows different levels of discrepancies. To perform local error detection, the size of the measured mode shape vectors is first expanded to the size of the F.E. eigenvectors. Model error localisation is based on the computation of residual strain energy due to errors in the constitutive equations. Updating parameters are then selected using eigenvalue sensitivity and local error analyses. The error localisation procedure is followed by the updating process in order to improve the accuracy of the FE models. The quality of the results is assessed in terms of accuracy of the response prediction to structural modifications. [less ▲]

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See detailFinite element modeling of an electrostatic painting device
Deliège, Geoffrey ULg; Henrotte, François; Hameyer, Kay

in IEEE Transactions on Magnetics (2003), 39(3), 1432-1435

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See detailFinite Element Modeling of Electro-Mechanical Coupling in Capacitive Micro-Systems
Rochus, Véronique ULg; Rixen, Daniel; Golinval, Jean-Claude ULg

Conference given outside the academic context (2005)

In this paper advanced multi-physics simulations of micro-electro-mechanical systems (MEMS) are used to investigate their dynamic behaviour. The strong coupled electro-mechanical Finite Element (FE ... [more ▼]

In this paper advanced multi-physics simulations of micro-electro-mechanical systems (MEMS) are used to investigate their dynamic behaviour. The strong coupled electro-mechanical Finite Element (FE) formulation is used to model the electro-mechanical interactions and to perform modal and transient analysis taking into account large deformation e®ects. The application examples simulate two micro-resonators consisting in a clamped-clamped beam suspended over a substrate (the lower electrode). When a voltage is applied between the beam and the substrate, electrostatic forces appear which force the beam to bend. When the applied voltage is increased up to the pull-in limit, the electrostatic force becomes dominant and the plates stick together. The pull-in voltage is an essential design parameters in capacitive micro-systems. Here we also de¯ne a new design parameter describing the limit dynamic behaviour, namely the dynamic pull-in voltage. [less ▲]

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See detailFinite element modeling of electrostatic MEMS including the impact of fringing field effects on forces
Boutaayamou, Mohamed ULg; V Sabariego, Ruth ULg; Dular, Patrick ULg

in Sensor Letters (2008), 6(1), 115-120

The numerical models describing the behaviour of electrostatically actuated microsystems often disregard fringing fields. However, taking fringing fields into account is crucial for an accurate ... [more ▼]

The numerical models describing the behaviour of electrostatically actuated microsystems often disregard fringing fields. However, taking fringing fields into account is crucial for an accurate computation of the electrostatic forces. In this work, the finite element method is applied for modeling electrostatic actuators. The electrostatic force distribution is obtained by locally applying the virtual work method. A micro-beam and a comb drive are considered as test cases. The impact of the fringing field effects on the accurate computation of electrostatic forces and capacitances is shown through 2D and 3D parametric studies. [less ▲]

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See detailFinite element modeling of incremental forming of aluminium sheets
He, S.; Van Bael, A.; Van Houtte, P. et al

in Advanced Materials Research (2005), 6/8

Incremental forming is an innovative and flexible sheet metal forming technology for small batch production and prototyping, which does not require any dedicated die or punch to form a complex shape. This ... [more ▼]

Incremental forming is an innovative and flexible sheet metal forming technology for small batch production and prototyping, which does not require any dedicated die or punch to form a complex shape. This paper investigates the process of single point incremental forming of an aluminum cone with a 50-degree wall angle both experimentally and numerically. Finite element models are established to simulate the process. The output of the simulation is given in terms of final geometry, the thickness distribution of the product, the strain history and distribution during the deformation as well as the reaction forces. Comparison between the simulation results and the experimental data is made. [less ▲]

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See detailFinite Element Modeling of the Cyclic Wetting Mechanism in the Active Part of Wheat Awns
Zickler, Gerald A.; Ruffoni, Davide ULg; Dunlop, John W. C. et al

in BIOINTERPHASES (2012), 7(1-4), 42-9

Many plant tissues and organs are capable of moving due to changes in the humidity of the environment, such as the opening of the seed capsule of the ice plant and the opening of the pine cone. These are ... [more ▼]

Many plant tissues and organs are capable of moving due to changes in the humidity of the environment, such as the opening of the seed capsule of the ice plant and the opening of the pine cone. These are fascinating examples for the materials engineer, as these tissues are non-living and move solely through the differential swelling of anisotropic tissues and in principle may serve as examples for the bio-inspired design of artificial actuators. In this paper, we model the microstructure of the wild wheat awn (Triticum turgidum ssp. dicoccoides) by finite elements, especially focusing on the specific microscopic features of the active part of the awn. Based on earlier experimental findings, cell walls are modeled as multilayered cylindrical tubes with alternating cellulose fiber orientation in successive layers. It is shown that swelling upon hydration of this system leads to the formation of gaps between the layers, which could act as valves, thus enabling the entry of water into the cell wall. This supports the hypothesis that this plywood-like arrangement of cellulose fibrils enhances the effect of ambient humidity by accelerated water or vapor diffusion along the gaps. The finite element model shows that a certain distribution of axially and tangentially oriented fibers is necessary to generate sufficient tensile stresses within the cell wall to open nanometer-sized gaps between cell wall layers. [less ▲]

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See detailFinite element modeling of thermo-mechanical behaviour of a steel strand in continuous casting
Pascon, Frédéric ULg; Habraken, Anne ULg; Bourdouxhe, M. et al

in Habraken, Anne (Ed.) Proceedings of the 4th International Conference ESAFORM (2001)

Surface and internal quality of continuous cast products depends very much upon the behaviour of the strand in the mould. Among the parameters likely to influence this behaviour, the mould taper takes a ... [more ▼]

Surface and internal quality of continuous cast products depends very much upon the behaviour of the strand in the mould. Among the parameters likely to influence this behaviour, the mould taper takes a prominent part. In order to understand better the influence of this parameter, we have build up a thermo-mechanical finite element model. the model includes an elasto-visco-plastic law to describe the behaviour of steel from liquid to solid state, a thermo-mechanical element that takes into account thermal expansion and mechanical behaviour of the strand, a unilateral contact element, a mobile rigid boundary element to model the mould and its taper and an adapted loading element to model the ferrostatic pressure according to the liquid or solid state. [less ▲]

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See detailFinite element modelling and optimization of flexible multibody systems
Bruls, Olivier ULg

Scientific conference (2010, June)

Detailed reference viewed: 25 (4 ULg)
See detailFinite element modelling of an electrostatic painting device
Deliège, Geoffrey ULg; Henrotte, François; Hameyer, Kay

Conference (2002)

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See detailFinite element modelling of electrostatic MEMS including the impact of fringing field effects on forces
Boutaayamou, Mohamed ULg; Nair, Harish; V Sabariego, Ruth ULg et al

in Proceedings of the 7th International Conference on Thermal, Mechanical and Multiphysics Simulation and Experiments in Micro-Electronics and Micro-Systems (EuroSimE2006) (2006)

The numerical models describing the behaviour of electrostatically actuated microsystems often disregard fringing fields. However, taking the fringing fields into account is crucial for an accurate ... [more ▼]

The numerical models describing the behaviour of electrostatically actuated microsystems often disregard fringing fields. However, taking the fringing fields into account is crucial for an accurate computation of the electrostatic forces. In this work, the finite element method is applied for modeling electrostatic actuators. The electrostatic force distribution is obtained by locally applying the virtual work method. A micro-beam and a comb drive are considered as test cases. The impact of the fringing field effects on the accuracy of electrostatic forces is shown through 2D and 3D parametric studies. [less ▲]

Detailed reference viewed: 68 (28 ULg)
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See detailFinite element modelling of ion convection by electrostatic forces
Deliège, Geoffrey ULg; Henrotte, François; Deprez, Wim et al

in IET Science, Measurement & Technology (2004), 151(6), 398-402

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See detailFinite element modelling of jointed rocks. Application to tunelling
Charlier, Robert ULg; El Kiri, Mohamed

in Int. Symp. on Assesment and preventin of failure phenomena in rocks engineering, ISMR (1993)

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See detailFinite element modelling of rock drilling.
Charlier, Robert ULg; Pierry, Joelle

in Int. Symp. on Assesment and prevention of failure phenomena in rocks engineering, ISMR (1993)

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See detailFinite element Modelling of Shear Band Localisation and Application to Rock Cutting by a PDC Tool
Pierry, J.; Charlier, Robert ULg

in Proc. EUROCK'94 (1994, August)

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See detailFinite Element Modelling of Strong Electro-Mechanical Coupling in MEMS
Rochus, Véronique ULg

Doctoral thesis (2006)

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See detailFinite element modelling of the competition between shear bands in the early stage of thrusting : Strain localisation and constitutive law influence
Barnichon, Jean-Dominique; Charlier, Robert ULg

in Special Publication - Geological Society of London (1996), 99

Detailed reference viewed: 64 (6 ULg)
See detailFinite element modelling of the induction heating of a moving wire
Henrotte, François; Pahner, Uwe; Deliège, Geoffrey ULg et al

in Compumag, Evian, France, July 2-5, 2001 (2001)

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See detailFinite element modelling of thermo-elasto-plastic water saturated porous materials
Sanavia, Lorenzo; François, Bertrand ULg; Bortolotto, Roberto et al

in Journal of Theoretical and Applied Mechanics (2008), 38(1-2), 7-34

The purpose of this paper is to present a new nite element formulation for the hydro-thermo-mechanical analysis of elasto-plastic multiphase materials based on Porous Media Mechanics. To this end, the ... [more ▼]

The purpose of this paper is to present a new nite element formulation for the hydro-thermo-mechanical analysis of elasto-plastic multiphase materials based on Porous Media Mechanics. To this end, the ACMEG-T thermo-plastic constitutive model for saturated soils has been implemented in the nite element code COMES-GEO. Validation of the implemented model is made by selected comparison between model simulation and experimental results for di erent combinations of thermo-hydro-mechanical loading paths. A case of non-isothermal elasto-plastic consolidation is also shown. [less ▲]

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See detailFinite element modelling of thermo-elasto-plastic water saturated porous materials
Luison, Loris; François, Bertrand ULg; Bortolotto, Roberto et al

Poster (2008)

Detailed reference viewed: 17 (2 ULg)