References of "Papeleux, Luc"
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See detailThermoviscoplasticity at Finite Strains: A Thermoelastic Predictor-Viscoplastic Corrector Algorithm
Ponthot, Jean-Philippe ULg; Papeleux, Luc ULg

in Hetnarski, Richard B. (Ed.) Encyclopedia of Thermal Stresses (2014)

This contribution aims at describing the numerical background associated to an efficient time integration procedure for thermomechanical elastic-viscoplastic constitutive model in a large deformation ... [more ▼]

This contribution aims at describing the numerical background associated to an efficient time integration procedure for thermomechanical elastic-viscoplastic constitutive model in a large deformation context. First, from the continuum mechanics point of view, the constitutive model is established. Within the framework of viscoplasticity, we have tried to remain as general as possible and the presented model encompasses under the same unified format, both {\it Perzyna-Chaboche} model of viscoplasticity which is well suited for moderate strain rates, as well as {\it Johnson-Cook} model which is a reference for metals submitted to high strain rates. Both incorporate nonlinear isotropic and kinematic hardening models. The classical rate-independent elastic-plastic model can then be easily recovered by setting the viscous terms to zero. Second, as the resulting continuum model is a stiff first order ordinary differential system in time, an integration algorithm is presented. This algorithm generalizes the classical "radial return algorithm", well established for elasto-plasticity, to thermo-elastic-viscoplastic models. The differential equations are numerically integrated using a thermoelastic predictor-viscoplastic corrector algorithm. The resulting algorithm is once again quite general and contains as special cases isothermal viscoplastic cases as well as classical rate-independent plasticity. Thanks to that generality, only one unified algorithm can be used both for plastic (rate-independent) as well as viscoplastic (rate-dependent) material models. Besides, in the formulation, a special care has also been taken so that all material parameters, including thermal dilatation, can be temperature dependent. As a consequence, it is also possible to model a continuous transition from elevated temperatures (that require the use of a viscoplastic model) to room temperature where rate-independent models are sometimes better suited by using a temperature-dependent viscosity that goes to zero as the room temperature is approached. [less ▲]

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See detailAn implicit erosion algorithm for the numerical simulation of metallic and composite materials submitted to high strain rate.
Ponthot, Jean-Philippe ULg; Boman, Romain ULg; Jeunechamps, Pierre-Paul et al

in Proceedings Indian National Science Academy (2013), 79/4(Part A), 519-528

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

In this paper, we present a general consistent numerical formulation able to take into account strain rate, damage and thermal effects of the material behaviour. A thermomechanical implicit approach for element erosion to model material failure is also presented. This approach can be applied both to ductile fracture for metals, relying on a continuum damage mechanics approach, coupled to different fracture criteria, as well as composite material failure described with either a failure criterion or a progressive damage model. The numerical models will be illustrated by different quasi-static and high strain rate applications for both metallic alloys and composite materials. All these physical phenomena have been included in an implicit dynamic object-oriented finite element code (implemented at LTAS-MN²L, University of Liège, Belgium) named Metafor [1]. [less ▲]

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See detailEvaluation of the mechanical properties of plasma-sprayed coating by nanoindentation technology
Guo, Weichao; Rauchs, Gast; Papeleux, Luc ULg et al

in Mechanics & Industry (2012), 13(3), 151-162

In this paper, the mechanical properties of plasma-sprayed coatings are evaluated using the technology of nanoindentation. According to the indentation curve (load versus indenter’s displacement), which ... [more ▼]

In this paper, the mechanical properties of plasma-sprayed coatings are evaluated using the technology of nanoindentation. According to the indentation curve (load versus indenter’s displacement), which is recorded in an indentation experiment, the mechanical behaviour of the plasma-sprayed coating is investigated via inverse analysis using numerical optimization algorithms. The tip rounding of imperfect indenters is investigated in parameter identification. Subsequently, the hardness on the top surface and on the vertical cross section of the plasma-sprayed coating are investigated. The results show that the hardness on the top surface of the coating depends on the indentation depth. Moreover, the results show that the hardness on the cross section of the coating is significantly affected by the substrate if the indentation impression is too close to the coating-substrate interface. [less ▲]

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See detailDamage and Fracture of Materials Submitted to High Strain Rates. A Thermomechanically Implicit Coupled Approach with Element Erosion
Jeunechamps, Pierre-Paul; Boman, Romain ULg; Papeleux, Luc ULg et al

in Proceedings of the 3rd International Conference on Impact Loading of Lightweight Structures (2011, June 28)

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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 detailApplication of the Arbitrary Lagrangian Eulerian Formulation to the Numerical Simulation of Forming Process
Boman, Romain ULg; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in Hora, Pavel (Ed.) Numisheet 2008: 7th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes (2008, September)

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See detailAn Efficient Numerical Model for the Numerical Simulation of Forming Processes
Ponthot, Jean-Philippe ULg; Boman, Romain ULg; Papeleux, Luc ULg et al

in Khan, Akhtar; Farrokh, Babak (Eds.) Mechanics and Mechanisms of Finite Plastic Deformation : Proceedings of PLASTICITY'08, Fourteenth International Symposium on Plasticity and its Current Applications (2008, January)

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case ... [more ▼]

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case, this method allows the use of a refined mesh near the tools, leading to an accurate representation of the chip formation (metal cutting) and the bending of the sheet (roll forming) with a limited computational time. [less ▲]

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See detailAn Arbitrary Lagrangian Eulerian Formulation for the Numerical Simulation of Forming Processes
Boman, Romain ULg; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in International Workshop 2007: Advancements in Design Optimization of Materials, Structures and Mechanical Systems (2007, December)

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See detailApplication of the Arbitrary Lagrangian Eulerian Formulation to the Numerical Simulation of Forming Process
Boman, Romain ULg; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in Owen, D. R. J.; Oñate, E. (Eds.) COMPLAS 2007 : IX International Conference on Computational Plasticity Fundamentals and Applications (2007, September)

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See detailA General Arbitrary Lagrangian Eulerian Formulation for the Numerical Simulation of 3D forming Processes
Boman, Romain ULg; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in AIP Conference Proceedings (2007, May 17), 908

In this paper, the arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case ... [more ▼]

In this paper, the arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 2D metal cutting operation and a 3D U-shaped cold roll forming process. Compared to the Lagrangian case, this method allows the use of a refined mesh near the tools, leading to an accurate representation of the chip formation (metal cutting) and the bending of the sheet (roll forming) with a limited computational time. The main problem of this kind of simulation is the rezoning of the nodes on the free surfaces of the sheet. A modified iterative isoparametric smoother is used to manage this geometrically complex and CPU expensive task. c 2007 American Institute of Physics. [less ▲]

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See detailCold Roll Forming and Metal Cutting Simulation using a 3D Arbitrary Lagrangian Eulerian Formulation
Boman, Romain ULg; Papeleux, Luc ULg; Ponthot, Jean-Philippe ULg

in de Saxcé, Géry; Moës, Nicolas (Eds.) Modeling in Mechanical and Civil Engineering : Collection of Papers from Prof. Nguyen Dang Hung's former students (2006)

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See detailApplication of the Arbitrary Lagrangian Eulerian Formulation to the Numerical Simulation of Cold Roll Forming Process
Boman, Romain ULg; Papeleux, Luc ULg; Bui, Quoc Viet et al

in Journal of Materials Processing Technology (2006), 177(1-3), 621-625

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 3D U-shaped cold roll forming process. Compared to the Lagrangian case, this method allows to keep a ... [more ▼]

In this paper, the Arbitrary Lagrangian Eulerian formalism is used to compute the steady state of a 3D U-shaped cold roll forming process. Compared to the Lagrangian case, this method allows to keep a refined mesh near the tools, thus allowing accurate contact prediction all along the computation with a limited number of elements. Mesh can also be kept refined in the bending zone, thus leading to accurate representation of the sheet with a limited computational time. The main problem of this kind of simulation lies in the rezoning of the nodes on the free surfaces of the sheet. A modified iterative isoparametric smoother is used to manage this geometrically complex and CPU expensive task. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailSpringback and Twist Prediction of Roll Formed Parts
Bui, Quoc Viet; Boman, Romain ULg; Papeleux, Luc ULg et al

in Santos, Abel D.; Barata da Rocha, A. (Eds.) Proceedings of the IDDRG 2006 International Deep Drawing Research Group, Drawing the things to come, Trends and Advances in Sheet Metal Forming (2006, June)

In the construction market, Roll Forming is the reference forming process. Numerous parts are achieved in such a way: purlins, steeldecks or suspended ceiling parts are examples of it. Roll Forming is ... [more ▼]

In the construction market, Roll Forming is the reference forming process. Numerous parts are achieved in such a way: purlins, steeldecks or suspended ceiling parts are examples of it. Roll Forming is also more and more used in the automotive industry, as it constitutes a good alternative to forming for High Strength Steels. Among the major requirements to obtain a defect-free product are outlined: the accurate geometry of the part, the taking into account of the springback as well as the prediction of twist. Furthermore, the roll forming operation could be only the first forming operation: the part could be curved or locally deep drawn afterwards. FE codes could allow fulfilling these requirements. However, they need significant advances in terms of material model description and numerical development. This paper presents the work done in order to predict the geometry and the behaviour of a roll formed part: First the material is characterized in complex strain paths in order to identify elaborated microstructural model like Teodosiu’s one. This model is able to take into account Bauschinger effect, orthogonal strain paths, isotropic/kinematic hardening. The METAFOR code is then used to have a better understanding of the mechanics of the deformation of the strip during the forming process. Several experimental campaigns were performed on the I-R&D ARCELOR roll forming machine to define a strong database in order to validate the numerical results. The geometry of machine as well as the shape of the channels inside and outside the RF machine were measured. Some experiments were even carried out in order to generate defects like twist in the roll formed profile. [less ▲]

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See detailA 3D Arbitrary Lagrangian Eulerian Formulation for the Numerical Simulation of Forming Processes. Application to cold roll forming and metal cutting
Boman, Romain ULg; Papeleux, Luc ULg; BUI, Q. V. et al

in Mota Soares, C. A. (Ed.) Proceedings of ECCM 2006, III European Conference on Computational Mechanics, Solids, Structures and Coupled Problems in Engineering (2006, June)

Detailed reference viewed: 42 (14 ULg)