References of "Ponthot, Jean-Philippe"
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See detailContinuous Roll Forming Simulation Using Arbitrary Lagrangian Eulerian Formalism
Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in Khalili, Nasser; Valliappan, Somasundaram; Li, Qing (Eds.) et al Proceedings of the joint 9th World Congress on Computational Mechanics and 4th Asian Pacific Congress on Computational Mechanics (2010, July)

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See detailAdvances in Numerical Simulation of Stationary Processes using Arbitrary Lagrangian Eulerian Formalism. Application to Roll Forming Process.
Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in ECCM 2010, 4th European Conference on Computational Mechanics (2010, May)

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See detailSmooth multiple-region mesh generation for biomedical applications
D'Otreppe, Vinciane ULg; Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in ECCM 2010, 4th European Conference on Computational Mechanics (2010, May)

The finite element method is commonly used in biomedical applications for the simulation of the behaviour of biological structures. However, extracting finite element meshes from medical data is still ... [more ▼]

The finite element method is commonly used in biomedical applications for the simulation of the behaviour of biological structures. However, extracting finite element meshes from medical data is still very challenging. In this article, an innovative system that efficiently reconstructs smooth, multi-material, 3D surface meshes from medical images is presented. Our approach is based on an enhanced Marching Tetrahedra algorithm, which extracts boundary surfaces between different materials within one sweep of the image stack in an integrated manner. Moreover,Multi-Level Partition of Unity implicit models are used to obtain a smooth and accurate surface representation of the original binary sampled surface. Mesh smoothing and decimation algorithms were also revised to adapt to the multi-material nature of the system as well as to adhere to the underlying volume data. [less ▲]

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See detailIsotropic continuum damage/repair model for alveolar bone remodelling
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

in Journal of Computational & Applied Mathematics (2010), 234

Several authors have proposed mechanical models to predict long term tooth movement, considering both the tooth and its surrounding bone tissue as isotropic linear elastic materials coupled to either an ... [more ▼]

Several authors have proposed mechanical models to predict long term tooth movement, considering both the tooth and its surrounding bone tissue as isotropic linear elastic materials coupled to either an adaptative elasticity behavior or an update of the elasticity constants with density evolution. However, tooth movements obtained through orthodontic appliances result from a complex biochemical process of bone structure and density adaptation to its mechanical environment, called bone remodeling. This process is far from linear reversible elasticity. It leads to permanent deformations due to biochemical actions. The proposed biomechanical constitutive law, inspired from Doblaré and García (2002) [30], is based on a elasto-viscoplastic material coupled with Continuum isotropic Damage Mechanics (Doblaré and García (2002) [30] considered only the case of a linear elastic material coupled with damage). The considered damage variable is not actual damage of the tissue but a measure of bone density. The damage evolution law therefore implies a density evolution. It is here formulated as to be used explicitly for alveolar bone, whose remodeling cells are considered to be triggered by the pressure state applied to the bone matrix. A 2D model of a tooth submitted to a tipping movement, is presented. Results show a reliable qualitative prediction of bone density variation around a tooth submitted to orthodontic forces. [less ▲]

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See detailA Continuum Damage Mechanics based bone remodelling model in a finite strain framework
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

in ECCM 2010, 4th European Conference on Computational Mechanics (2010)

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See detailAn improved constitutive model for the numerical simulation of semi-solid thixoforming
Koeune, Roxane ULg; Ponthot, Jean-Philippe ULg

in Journal of Computational & Applied Mathematics (2010), 234

In order to model thixoforming processes, previous papers presented a thermomechanical one-phase modelling. This first version of the constitutive model revealed several limitations: the model could not ... [more ▼]

In order to model thixoforming processes, previous papers presented a thermomechanical one-phase modelling. This first version of the constitutive model revealed several limitations: the model could not degenerate properly to pure solid or liquid behavior nor to free solid suspensions. The aim of this paper was to propose solutions to overcome these limitations. [less ▲]

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See detailInfluence of friction in material characterization in micro-indentation measurement
Guo, Weichao ULg; Rauchs, G.; ZHang, W. H. et al

in Journal of Computational & Applied Mathematics (2010), 234

A comprehensive computational study is undertaken to identify the influence of friction in material characterization by indentation measurement based on elasto- plastic solids. The impacts of friction on ... [more ▼]

A comprehensive computational study is undertaken to identify the influence of friction in material characterization by indentation measurement based on elasto- plastic solids. The impacts of friction on load versus indentation depth curve, and the values of calculated hardness and Young's modulus in conical and spherical indentations are shown in this paper. The results clearly demonstrate that, for some elasto-plastic materials, the curves of load versus indentation depth obtained either by spherical or conical indenters with different friction coefficients, cannot be distinguished. However, if utilizing the parameter (see text for details), to quantify the deformation of piling-up or sinking-in, it is easy to find that the influence of friction on piling-up or sinking-in in indentation is significant. Therefore, the material parameters which are related to the projected area will also have a large error caused by the influence of friction. The maximum differences on hardness and Young's modulus can reach 14.59% and 6.78%, respectively, for some elastic materials shown in this paper. These results do not agree with those from researchers who stated that the instrumented indentation experiments are not significantly affected by friction. [less ▲]

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See detailMetalub – A Slab Method software for the numerical simulation of mixed lubrication regime. Application to cold rolling
Carretta, Yves ULg; Stephany, Antoine; Legrand, Nicolas et al

in ICTMP 2010 - International Conference on Tribology in Manufacturing processes (2010)

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See detailComparison of Field Transfer Methods between two meshes
Bussetta, Philippe ULg; Ponthot, Jean-Philippe ULg

in Proceedings of "IV European Conference on Computational Mechanics" (2010)

In many cases, the numerical computation of mechanical problem with Finite Element Method has to transfer some information between two different meshes. For example, if a remeshing is needed or if several ... [more ▼]

In many cases, the numerical computation of mechanical problem with Finite Element Method has to transfer some information between two different meshes. For example, if a remeshing is needed or if several meshes are used (e.g. one for a thermal problem and another one for a mechanical problem). In spite of the research on the Transfer Methods, none of them has been so far clearly established as the best. Each method has advantages and disadvantages. Many problems can happen during the field transfer, like the minimization of the numerical diffusion, the value of the field on the boundaries, etc. This paper compares on the one hand the performances of the Field Transfer Method by classical interpolation with on the other hand one using Mortar Elements. The comparison of the two methods is based on two indicators: the numerical diffusion and the evaluation of the field on the boundaries. In this paper, only the continuous fields are considered. [less ▲]

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See detailValidation of a one-phase thermomechanical model for thixoforming of steel by comparison between numerical and experimental results on two semi-solid extrusion tests
Koeune, Roxane ULg; Rassili, Ahmed ULg; Pierret, Jean-Christophe ULg et al

in Yonglin, Kang (Ed.) 11th International Conference on Semi-Solid Processing of Alloys and Composites (2010)

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See detailSemi-solid metallic alloys modeling for the simulation of thixoforming processes
Koeune, Roxane ULg; Ponthot, Jean-Philippe ULg

in Vaz Jr., M.; de Souza Neto, E. A.; Munoz-Rojas, P. A. (Eds.) Computational Materials Modeling (2010)

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See detailValidation of a one-phase thermomechanical model for thixoforming of steel by comparison numerical and experimental results on two semi-solid extrusion tests.
Koeune, Roxane ULg; Ponthot, Jean-Philippe ULg

(2010)

This paper deals with the simulation of two extrusion tests by thixoforming: a non stationary extrusion test and a double-cup extrusion test. The simulations are based on a thermo-mechanical one-phase ... [more ▼]

This paper deals with the simulation of two extrusion tests by thixoforming: a non stationary extrusion test and a double-cup extrusion test. The simulations are based on a thermo-mechanical one-phase constitutive law that has been presented in details in several previous papers. A campaign of experimental extrusion testing has been conducted on a steel alloy and the comparison between the numerical and experimental results will validate the model under study. A new feature that has been added to the model is also discussed: the introduction of the phase change thermal effects such as the fusion latent heat and the contraction of the material. [less ▲]

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See detailStationary Roll Forming Simulation using Arbitrary Lagrangian Eulerian Formalism
Boman, Romain ULg; Depauw, Antoine; Hérisson, Damien et al

in Proceedings of International Roll Forming Congress 2009 (2009, October)

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See detailImplicit FE simulations of composite dynamic failure
Deliège, Geoffrey ULg; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in Proceedings of DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (2009, September)

This paper describes the implementation of failure criteria in an implicit finite element code. Tests are made with the Tsai-Wu criterion, which is widely used in the simulation of composite failure. The ... [more ▼]

This paper describes the implementation of failure criteria in an implicit finite element code. Tests are made with the Tsai-Wu criterion, which is widely used in the simulation of composite failure. The method is applied to the simulation of a tensile test of a laminate composite. The elasto-plastic material model of the composite ply, a polymer reinforced with woven carbon fabric, is described. Convergence of the results with respect to the mesh size and number of time steps is analysed and the reliability of the method is discussed. [less ▲]

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See detailImplicit 2D numerical simulation of materials submitted to high strain rate including failure
Jeunechamps, Pierre-Paul ULg; Ponthot, Jean-Philippe ULg

in Proceedings of DYMAT 2009 - 9th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (2009, September)

In this paper, we present a general consistent numerical formulation able to take into account strain rate and thermal effects of the material behavior. A thermomechanical implicit approach for element ... [more ▼]

In this paper, we present a general consistent numerical formulation able to take into account strain rate and thermal effects of the material behavior. A thermomechanical implicit approach for element erosion to model material failure is also presented. The numerical model will be illustrated by applications both from the metal forming and the impact domain. All these physical phenomena have been included in an implicit dynamic oriented object finite element code (implemented at LTAS-MN2L, University of Liège, Belgium) named Metafor [http://www.ltas-mnl.ulg.ac.be/dokuwiki doku.php?id=metafor:start]. [less ▲]

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