References of "Habraken, Anne"
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See detailDevelopment of a Mesoscopic Cell Modeling the Damage Process in Steel at Elevated Temperature
Castagne, Sylvie; Remy, M.; Habraken, Anne ULg

in Key Engineering Materials [=KEM] (2003), 233-236

An on going project whose goal is the development and identification of a mathematical model of steel at elevated temperature using a mesoscopic approach is presented. The research aims to study the ... [more ▼]

An on going project whose goal is the development and identification of a mathematical model of steel at elevated temperature using a mesoscopic approach is presented. The research aims to study the damage process at elevated temperature using information from the macroscopic and mesoscopic scales. As a final application our results will be used to study the industrial process of continuous casting of low carbon steel. [less ▲]

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See detailLingopti project: semi-continuous casting process of coper-nickel alloys
Pecquet, Etienne ULg; Pascon, Frédéric ULg; Lecomte-Beckers, Jacqueline ULg et al

in Dick, E.; Vierendeels, J.; Cantrijn, F. (Eds.) et al Proceedings of the 6th national congress on theoretical and applied mechanics (2003)

Lingopti project is a First Europe project. It treats semi-continuous casting of copper-nickel alloys ingots. The research, performed in the University of Liège, consists in the optimisation of the mould ... [more ▼]

Lingopti project is a First Europe project. It treats semi-continuous casting of copper-nickel alloys ingots. The research, performed in the University of Liège, consists in the optimisation of the mould and the whole casting process of the LBP S.A. company (Chênée – Liège) to obtain better cast products. In fact, cast products sometimes present long oscillation marks (λ ≈ 500mm) and some ingots have many internal cracks. The semi-continuous process consists in the vertical casting of 7m height ingots. The goal is also to test different chemical compositions of the material and to predict what happens on the casting process. [less ▲]

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See detailMicro-macro analysis of steel sheet behaviour in finite element simulations. Application to deep-drawing process.
Duchene, Laurent ULg; Godinas, A.; Cescotto, Serge ULg et al

in Cescotto, Serge (Ed.) Proceedings of the Sixth European Mechanics of Materials Conference (EMMC6) Non Linear Mechanics of Anisotropic Materials (2002, September)

This paper 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 ... [more ▼]

This paper 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 ▲]

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See detailProgress in microscopic modeling of damage in steel at high temperature
Remy, M.; Castagne, Sylvie; Habraken, Anne ULg

in International Journal of Forming Processes (2002), 5(N°2-3-4/2002), 445-455

With the goal to study crack propagation in continuous casting, this paper presents an on going project to develop and identify a mathematical finite element model of damage in steel at high temperature ... [more ▼]

With the goal to study crack propagation in continuous casting, this paper presents an on going project to develop and identify a mathematical finite element model of damage in steel at high temperature. A representative microscopic cell of the material is presented and adapted to available chemical information, precipitation state and micro-structures observed using metallographic as weel as imaging methods (optical microscopy, SEM, orientation imaging microscopy). Compression tests of cylindrical samples after a thermal treatment have been performed to identify the parameters of an elasto-visco-plastique law of Norton-Hoff type. Hot damage tests in tensile and compression states help to provide information on crack appearance. [less ▲]

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See detailAcceleration of finite element analysis by parallel processing
Moto Mpong, S.; de Montleau, P.; Godinas, A. et al

in Pietrzyk, M.; Mitura, Z.; Kaczmar, J. (Eds.) Proceedings of the 5th international ESAFORM Conference on Material Forming (2002)

The finite element code LAGAMINE developed since 1982 has been adapted to numerous finite elements and constitutive laws. The present researches on micro-macro modelling increase the requirement of CPU ... [more ▼]

The finite element code LAGAMINE developed since 1982 has been adapted to numerous finite elements and constitutive laws. The present researches on micro-macro modelling increase the requirement of CPU time. The parallelization of software is often divided into two main approaches: the coarse grain approach and the fine grain approach. For Finite Element software, the coarse grain method is usually characterized by the use of the mesh partitioning. In the fine grain approach, there is no partition of the mesh. The parallel program is made by the parallelization of instructions issued of the nalysis of dependences between the instructions, and the loops. The efficiency of all these approaches depends on the organization of the memory and on the used exchange protocol (MPI, PVM, or OpenMP). Our approach is intermediate between these two main categories of parallelization. It is characterized by the parallelization of the assembly of the stiffness matrix using a coarse grain approach and the use of a parallel direct solver. Because of the architecture of the available parallel computers, which are shared memory, we decided to use OpenMP protocol. [less ▲]

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See detailIdentification d'une loi thermo-élasto-viscoplastique en vue de la modélisation du laminage à chaud du cuivre
Moureaux, P.; Moto Mpong, S.; Remy, M. et al

in Journal de Physique IV (2002), 102

la mise au point d'un modèle de simulation de la dernière passe du laminage à chaud du cuivre ne présente à priori pas de problème du point de vue numérique pour un code d'éléments finis non linéaire. La ... [more ▼]

la mise au point d'un modèle de simulation de la dernière passe du laminage à chaud du cuivre ne présente à priori pas de problème du point de vue numérique pour un code d'éléments finis non linéaire. La collecte d'informations précises tant sur le procédé industriel que sur le comportement du matériau est par contre une opération non triviale. Cet article présente les diverses méthodes expérimentales mises en œuvre pour caractériser le matériau: essais de compression à chaud, mesures d'analyse thermique différentielle, essais de dilatométrie et de diffusivité. Les méthodes permettant d'identifier les paramètres de la loi élasto-visco-plastique de type Norton-Hoff à partir des essais sont présentées et une analyse bibliographique investigue le problème de la détermination du module de Young à haute température. Tant les hypothèses supplémentaires relatives au procédé et nécessaires au modèle que les résultats finaux sont résumés. [less ▲]

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See detailA parallel computing model for the acceleration of a finite element software
Moto Mpong, Serge; de Montleau, Pierre; Godinas, André et al

in Arabnia, H. R. (Ed.) Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications (2002)

This paper presents the parallelization model used for the non-linear finite element software LAGAMINE. The proposed model is based on the use of a coarse grain approach for the parallelization of the ... [more ▼]

This paper presents the parallelization model used for the non-linear finite element software LAGAMINE. The proposed model is based on the use of a coarse grain approach for the parallelization of the assembly of the stiffness matrix. For the solver of the generated linear problem, we used a parallel direct solver of Gauss type. Finally, we present a discussion of the results of our approach on an example of depp drawing. [less ▲]

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See detailFinite element thermo-mechanical model of continuous steel casting
Pascon, Frédéric ULg; Habraken, Anne ULg

in Kiuchi, M.; Nishimura, H.; Yanagimoto, J. (Eds.) Proceedings of the 7th International Conference on Advanced Technology of Plasticity (2002)

Problems in continuous casting of steel are numerous and have been leading producers to find ever more efficient solutions. Wa have developed a thermomechanical model of continuous casting, using a non ... [more ▼]

Problems in continuous casting of steel are numerous and have been leading producers to find ever more efficient solutions. Wa have developed a thermomechanical model of continuous casting, using a non-linear finite element code. Since a complete 3D discretization seemed impossible, the model has been based on a generalized plane strain state (2D1/2) and it includes at the same time thermal exchanges, mechanical behaviour of steel at very high temperature, the ferrostatic pressure and contact between the strand and the machine. This paper presents some results of two industrial applications. First results tend to prove the importance of some process factors (such as the mould taper) and local defects of the machine on the quality of cast products, according with observations. [less ▲]

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See detailTexture analysis of cylindrical cup during deep-drawing process
Flores, Paulo; Duchene, Laurent ULg; Habraken, Anne ULg

in Yang, D. Y.; Oh, S. I.; Huh, H. (Eds.) et al Proceedings of the 5th international conference NUMISHEET 2002 (2002)

This paper presents the simulation of a deep-drawing process using three different constitutive laws: strain rate space yield locus description with an isotropic hardening law, strain rate space yield ... [more ▼]

This paper presents the simulation of a deep-drawing process using three different constitutive laws: strain rate space yield locus description with an isotropic hardening law, strain rate space yield locus description with a combined (isotropic and kinematic) hardening law, and stress space yield locus description with an isotropic hardening law. To take into consideration material anisotropy, the yield locus is computed from the crystallographic texture using Taylor's model, a dual plastic potantial and combined hardening law taking into account the dislocations microstructures. The results obtained by these three constitutive laws are compared with experimental ones. [less ▲]

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See detailNumerical simulation of the solidification of a beam blank in the mould
Hubsch, P.; Bourdouxhe, M.; Pascon, Frédéric ULg et al

in Proceedings of the 4th European Continuous Casting Conference (2002)

The stability of the casting process and the wear of the mould as well as the quality of the product depend strongly on the mould design. This is particularly true when considering the production of beam ... [more ▼]

The stability of the casting process and the wear of the mould as well as the quality of the product depend strongly on the mould design. This is particularly true when considering the production of beam blanks. If the mould is too tight, thermal contraction can generate considerable contact forces between the product and the mould on the inner surfaces of the flanges. If it is not tight enough, the thermal coupling between the mould and the beam blank is not sufficient to allow the solidification of a skin of the required thickness upon exit from the mould. A finite element model was developed to assist in the mould design. This model takes both the thermal and mechanical interaction between the mould and the product into account. The effect of solidification is implicitly included in the (thermal) finite element formulation while the ferro-static pressure is applied by the means of a specially developed element. The model was applied to a medium gage beam blank cast at ProfilARBED Differdange. The skin thickness as well as the localisation of the wear of the mould predicted by the model are in good agreement with observations made in industrial practice. [less ▲]

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See detailSwaged bolts: modelling of the installation process and numerical analysis of the mechanical behaviour
Drean, M.; Habraken, Anne ULg; Bouchaïr, A. et al

in Computers & Structures (2002), 80

Swaged bolts are an alternative to high strength bolts in steel structures. To clarify the steps of the installation process, numerical modelling has been carried out. The relevant phenomena are described ... [more ▼]

Swaged bolts are an alternative to high strength bolts in steel structures. To clarify the steps of the installation process, numerical modelling has been carried out. The relevant phenomena are described and evaluated. This numerical calculation accounts for large displacements, large strains, mechanical plasticity and friction contact between the components of swaged bolts. The non-linear finite element code ‘‘Lagamine’’ designed for the simulation of metal forming processes has been used to provide the stress distributions in the components. [less ▲]

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See detailTexture evolution during deep-drawing processes
Duchene, Laurent ULg; Godinas, A.; Cescotto, Serge ULg et al

in Journal of Materials Processing Technology (2002), 125-126

This paper 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 ... [more ▼]

This paper 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 ▲]

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See detailMicro-mechanical analysis of steel sheet behaviour during deep-drawing
Duchene, Laurent ULg; Godinas, A.; Habraken, Anne ULg et al

in Proceedings of the First Asian-Pacific Congress on Computational Mechanics: APCOM 2001 (2001)

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See detailAnisotropic elastoplastic model based on texture
Habraken, Anne ULg; Duchene, Laurent ULg; Godinas, André et al

in Handbook of materials behavior models (2001)

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See detailInfluence of steel anisotropy during deep-drawing process
Duchene, Laurent ULg; Habraken, Anne ULg; Godinas, A.

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

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

This paper presents a constitutive law based on Taylor's model implemented in our 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 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 ▲]

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

in Proceedings of the 7th European Conference on Advanced Materials and processes (Euromat 2001) (2001)

An elastic-viscous-plastic constitutive law (Norton-Hoff type) is coupled to a contact law in a finite element code in order to model the behaviour of a steel strand in the mould of a continuous casting ... [more ▼]

An elastic-viscous-plastic constitutive law (Norton-Hoff type) is coupled to a contact law in a finite element code in order to model the behaviour of a steel strand in the mould of a continuous casting machine. Both thermal and mechanical type fields are computed. The objective is to compare for different industrial process conditions the thickness of the solidified shell as well as the stress and strain levels in this layer. More particularly, the model should lead to optimise the taper of the mould for different cross sections of steel strand. [less ▲]

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See detailA fully coupled anisotropic elasto-plastic-damage model
Cescotto, Serge ULg; Wauters, Michaël; Habraken, Anne ULg et al

in Handbook of Materials Behavior Models (2001)

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See detailAnisotropic Elastoplastic Model Based on Texture
Habraken, Anne ULg

in Lemaitre Handbook of Materials Behavior Models (2001)

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See detailImplementation of a texture based interpolated yield locus in a FEM code
Duchene, Laurent ULg; Habraken, Anne ULg; Godinas, A.

in Balkema (Ed.) Proceedings of NUMIFORM 2001 (Simulation of Materials Processing: Theory, Methods and Applications) (2001)

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

This paper presents a constitutive law based on Taylor's model implemented in our non linear finite element code LAGAMINE. The yield locus is only 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 ▲]

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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: 30 (6 ULg)