Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailNumerical simulation of a pyramid steel sheet formed by single point incremental forming using solid-shell finite elements
Duchene, Laurent ULg; Guzmán Inostroza, Carlos Felipe ULg; Behera, Amar Kumar et al

in Key Engineering Materials [=KEM] (2013)

Single Point Incremental Forming (SPIF) is an interesting manufacturing process due to its dieless nature and its increased formability compared to conventional forming processes. Nevertheless, the ... [more ▼]

Single Point Incremental Forming (SPIF) is an interesting manufacturing process due to its dieless nature and its increased formability compared to conventional forming processes. Nevertheless, the process suffers from large geometric deviations when compared to the original CAD profile. One particular example arises when analyzing a truncated two-slope pyramid. In this paper, a finite element simulation of this geometry is carried out using a newly implemented solid-shell element, which is based on the Enhanced Assumed Strain (EAS) and the Assumed Natural Strain (ANS) techniques. The model predicts the shape of the pyramid very well, correctly representing the springback and the through thickness shear (TTS). Besides, the effects of the finite element mesh refinement, the EAS and ANS techniques on the numerical prediction are presented. It is shown that the EAS modes included in the model have a significant influence on the accuracy of the results. [less ▲]

Detailed reference viewed: 124 (59 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of a quantum particle in a box
Hermann, Raphaël ULg

in Journal of Physics : A Mathematical & General (1997), 30(11), 3967-3975

It is shown how one can get numerical prediction of quantum mechanical particle behaviour without using the Schrodinger equation. The main steps of this development are the non-differentiability ... [more ▼]

It is shown how one can get numerical prediction of quantum mechanical particle behaviour without using the Schrodinger equation. The main steps of this development are the non-differentiability hypothesis, the equations of motion entailed by this hypothesis, and the numerical formulation of a simple one-dimensional problem: the particle in a box. [less ▲]

Detailed reference viewed: 22 (3 ULg)
Full Text
Peer Reviewed
See detailNumerical Simulation of a Scroll Expander for Use in a Rankine Cycle
Lemort, Vincent ULg; Quoilin, Sylvain ULg; Lebrun, Jean ULg

(2008)

This paper presents two simulation models of scroll expanders for use in heat recovery Rankine cycle applications: a detailed reference model and a simplified model. The reference model associates a ... [more ▼]

This paper presents two simulation models of scroll expanders for use in heat recovery Rankine cycle applications: a detailed reference model and a simplified model. The reference model associates a detailed geometrical description of the expander to a thermodynamic modeling of the expansion process in the machine. Due to large computational effort, the reference model is not appropriate for simulation of the entire Rankine cycle system. The paper shows how a simplified model can be built from the reference model. This model involves a limited number of parameters, which describe the main features of the machine. An experimental study is carried out on a prototype of Rankine cycle working with HCFC-123. Based on detailed measurements, the validation of both models is conducted. It is found that both models are able to predict the mass flow rate, the delivered shaft power and the discharge temperature with a good accuracy. [less ▲]

Detailed reference viewed: 725 (37 ULg)
Full Text
See detailNumerical simulation of an arc column
Dauby, Bernard; Defise, Jean-Marc ULg; Legros, Willy ULg et al

in Proceedings of the 6th International Conference on Switching Arc Phenomena (1989)

Detailed reference viewed: 40 (7 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of an in-situ underground experiment for nuclear waste storage
Laloui, Lyesse; François, Bertrand ULg

in 12th IACMAG Conference (2008)

Following the need for understanding and quantifying the effect of temperature on the response of a candidate host formation for radioactive waste disposal, finite element modelling of an in-situ thermal ... [more ▼]

Following the need for understanding and quantifying the effect of temperature on the response of a candidate host formation for radioactive waste disposal, finite element modelling of an in-situ thermal experiment, named ATLAS, has been carried out. Based on a thermo-hydro-mechanical (THM) finite element approach including a consistent thermo-plastic constitutive model, it has been possible to reproduce the THM response of a clay formation submitted to in-situ thermal loading carried out in the underground research facility (HADES-URF) in Mol, Belgium. The results of the finite element modelling of the ATLAS experiment were compared with in-situ measurements and revealed the necessity to account for flow diffusion in all three directions through a 2D axisymmetric analysis. Finally, those results were interpreted in the light of elasto-thermoplasticity, which emphasizes the significant role of thermo-plastic processes in the global THM response of the clay formation. [less ▲]

Detailed reference viewed: 29 (0 ULg)
Full Text
See detailNumerical simulation of blaststructure interaction
Noels, Ludovic ULg; Radovitzky, Raul

Conference (2006)

Detailed reference viewed: 14 (1 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of bone regeneration in a bone chamber.
Geris, Liesbet ULg; Vandamme, K.; Naert, I. et al

in Journal of Dental Research (2009), 88(2), 158-63

While mathematical models are able to capture essential aspects of biological processes like fracture healing and distraction osteogenesis, their predictive capacity in peri-implant osteogenesis remains ... [more ▼]

While mathematical models are able to capture essential aspects of biological processes like fracture healing and distraction osteogenesis, their predictive capacity in peri-implant osteogenesis remains uninvestigated. We tested the hypothesis that a mechano-regulatory model has the potential to predict bone regeneration around implants. In an in vivo bone chamber set-up allowing for controlled implant loading (up to 90 microm axial displacement), bone tissue formation was simulated and compared qualitatively and quantitatively with histology. Furthermore, the model was applied to simulate excessive loading conditions. Corresponding to literature data, implant displacement magnitudes larger than 90 microm predicted the formation of fibrous tissue encapsulation of the implant. In contradiction to findings in orthopedic implant osseointegration, implant displacement frequencies higher than 1 Hz did not favor the formation of peri-implant bone in the chamber. Additional bone chamber experiments are needed to test these numerical predictions. [less ▲]

Detailed reference viewed: 13 (0 ULg)
See detailNumerical simulation of cavitation and grain growth during superplastic forming
Ponthot, Jean-Philippe ULg; ADAM, L.

in Proceedings of Plasticity, damage and Fracture at Macro, Micro and Nano Scales (2002)

Detailed reference viewed: 11 (1 ULg)
Full Text
Peer Reviewed
See detailNumerical Simulation of Cold Roll Forming Process
Bui, Quoc Viet; Papeleux, Luc ULg; Boman, Romain ULg et al

in Banabic, Dorel (Ed.) Proceedings of the 8th ESAFORM Conference on Material Forming (2005, April)

Cold roll-forming process of a U profile is modelled and simulated. The simulation is based on a 3D finite element analysis with the help of the home made Metafor code. The prediction on dimensions and ... [more ▼]

Cold roll-forming process of a U profile is modelled and simulated. The simulation is based on a 3D finite element analysis with the help of the home made Metafor code. The prediction on dimensions and deformed shape of the cold roll-formed sheet is in good agreement with the experimental results. Parametric study on roll forming parameters, such as the yield limit and the hardening property of materials, and the distance between stations is performed. [less ▲]

Detailed reference viewed: 62 (15 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of cold roll-forming processes
Bui, Quoc viet; Ponthot, Jean-Philippe ULg

in Journal of Materials Processing Technology (2008), 202(1-3), 275-282

3D finite element analysis is employed to simulate a cold roll-forming process. Numerical results of longitudinal strains and displacement trajectories are compared with experimental results available in ... [more ▼]

3D finite element analysis is employed to simulate a cold roll-forming process. Numerical results of longitudinal strains and displacement trajectories are compared with experimental results available in the literature. Through a parametri study, significant impacts of the yield limit and the work-hardening exponent on the product quality are observed, whereas forming speed and friction at roll-sheet interface appear to play a minor role. (C) 2007 Elsevier B.V. All rights reserved. [less ▲]

Detailed reference viewed: 79 (5 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of compacting process of a multi-stepped part – Comparison with experiments
Mosbah, P.; Shima, S.; Habraken, Anne ULg et al

in Journal of the Japan Society of Powder and Powder Metallurgy (1999), 46

Detailed reference viewed: 16 (3 ULg)
Peer Reviewed
See detailNumerical simulation of crashworthiness with an implicit finite element code
Graillet, Denis; Ponthot, Jean-Philippe ULg

in Aircraft Engineering & Aerospace Technology (1999), 71(1), 12-20

Implicit and explicit time integration schemes in conjunction with the finite element method are presented for the transient response of highly non-linear problems such as impact situations exhibiting ... [more ▼]

Implicit and explicit time integration schemes in conjunction with the finite element method are presented for the transient response of highly non-linear problems such as impact situations exhibiting important material dissipation. Surprisingly the implicit schemes lead to excellent convergence properties that make them a cost-efficient alternative to explicit scheme generally advocated as the best choice for these problems. As numerical illustrations, we present here the academic impact between two flexible bodies, a long tube and a long plate, as well as a more industrial-oriented application: the impact between a fan blade and a double casing. [less ▲]

Detailed reference viewed: 49 (4 ULg)
Full Text
Peer Reviewed
See detailNumerical Simulation of Double Cup Extrusion Test using the Arbitrary Lagrangian Eulerian Formalism
Boman, Romain ULg; Koeune, Roxane; Ponthot, Jean-Philippe ULg

in Proceedings of Coupled Problems 2013 (2013, June)

Detailed reference viewed: 46 (16 ULg)
Full Text
Peer Reviewed
See detailNumerical Simulation of Double Cup Extrusion Test Using the Arbitrary Lagrangian Eulerian Formalism
Boman, Romain ULg; Koeune, Roxane; Ponthot, Jean-Philippe ULg

in Idelsohn, Sergio R. (Ed.) Numerical Simulations of Coupled Problems in Engineering (2014)

In this chapter Double Cup Extrusion Test (DCET) is modelled using the finite element method with the help of the Arbitrary Lagrangian Eulerian (ALE) formalism. DCET is a tribological test involving very ... [more ▼]

In this chapter Double Cup Extrusion Test (DCET) is modelled using the finite element method with the help of the Arbitrary Lagrangian Eulerian (ALE) formalism. DCET is a tribological test involving very large deformations which are traditionally dealt with complicated and costly remeshing algorithms. Since the topology of ALE meshes should remain constant throughout the simulation, twovery thin layers of auxiliary elements are added to the initial mesh of the billet where the material is expected to flow. This numerical trick is combined with an original and efficient node relocation procedure which allows the model to take into account complex geometries of punches. The presented model is firstly validated for limited punch strokes thanks to a purely Lagrangian simulation. It is then compared with results from the literature. Eventually the general nature and the effectiveness of this numerical strategy is demonstrated by a fully-coupled thermomechanical simulation of thixoforming where the final shape of the billet is compared to experimental measurements. [less ▲]

Detailed reference viewed: 10 (4 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of DP steel damage using a physically-based GTN model
Fansi, Joseph; Habraken, Anne ULg; Balan, Tudor et al

Poster (2012)

Poster describing the identification and use of Gurson model on DP Steel

Detailed reference viewed: 32 (17 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of drying under variable external conditions: application to solar drying of seedless grapes
Bennamoun, Lyes ULg; Belhamri, Azeddine

in Journal of Food Engineering (2006), 76(2), 179-187

Detailed reference viewed: 8 (2 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of elastoviscoplastic large strains of metals at high temperature.
Cescotto, Serge ULg; Charlier, Robert ULg

in Proc. 8th Conf. on SMIRT (1985, August)

Detailed reference viewed: 8 (0 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of finite strain viscoplastic problems
Garcia-Garino, Carlos; Andia fages, Susana; Mirasso, Anibal et al

in International Journal of Computational & Applied Mathematics (2013), 246

A large strain elastoplastic constitutive model based on hyperelasticity and multiplicative decomposition of deformation gradient tensor is extended to viscous case, in a framework similar to the one that ... [more ▼]

A large strain elastoplastic constitutive model based on hyperelasticity and multiplicative decomposition of deformation gradient tensor is extended to viscous case, in a framework similar to the one that has been proposed by Ponthot in an hypoelastic context. In this way a very useful framework can be obtained, able to deal with both rate dependent and rate independent problems. In this work a review of theoretical details and numerical implementation of the model are discussed. Similarly to what is done in rate independent plasticity, a Newton–Raphson scheme has been used to solve the non linear consistency condition in order to compute the viscoplastic multiplier. A plane strain plate with a central circular hole under tension is simulated in order to test the proposed model. Large deformation effects are considered in all the simulations carried out. Different parameters of the constitutive model are varied in order to study the sensitivity of the proposed algorithm. [less ▲]

Detailed reference viewed: 13 (1 ULg)
Full Text
Peer Reviewed
See detailNumerical simulation of heat transfer associated with low enthalpy geothermal pumping in an alluvial aquifer
Fossoul, Frédérique ULg; Orban, Philippe ULg; Dassargues, Alain ULg

in Geologica Belgica (2011), 14(1-2),

In a context favourable to renewable energies, various aquifers are studied to supply heating and/or cooling systems. The groundwater flow and heat transport are modelled in the alluvial aquifer of the ... [more ▼]

In a context favourable to renewable energies, various aquifers are studied to supply heating and/or cooling systems. The groundwater flow and heat transport are modelled in the alluvial aquifer of the river Meuse in providing an integrated tool for assessing the feasibility of a low energy air cooling/heating system for a large office building by pumping groundwater and discharging it in the river after being heated/cooled by using heat pumps. First, a comparative sensitivity analysis is performed using different codes for assessing the influence of coupling and non linearities on the main parameters due to the temperature evolution in function of time. Then, assuming that the aquifer temperature variation is weak enough to neglect its influence on hydrodynamics and thermal parameters, the MT3DMS and HydroGeoSphere codes are used for modelling the actual case-study. In practice, the worst case scenario considered by the project manager is the cooling of the office building during the hottest summer conditions. So, the influence of the warm water from the river Meuse is computed as it constitutes the major limiting factor. An optimisation of the pumping schema is computed to maximise the efficiency of the system. [less ▲]

Detailed reference viewed: 146 (26 ULg)