References of "Habraken, Anne"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailRoller Pressure Quench Process of Steel Plate Modelling
Lequesne, Cédric ULg; Pensis, O.; Renard, M. et al

in Proceedings of Esaform 2011 (2011)

In this study, the roller pressure quench process is applied on a low-alloy steel plate with significant thickness. The aim is to obtain martensitic high strength steel without modifying the flatness. In ... [more ▼]

In this study, the roller pressure quench process is applied on a low-alloy steel plate with significant thickness. The aim is to obtain martensitic high strength steel without modifying the flatness. In order to optimize the process parameters, a finite element model is developed. The analysis couples the mechanical, thermal and metallurgical fields. This model provides results about the final microstructure, the residual stresses and the flatness at the end of the cooling process. It has been noticed that a two dimensional plane strain simulation is not accurate because it does not predict physical transversal residual stresses. A three dimensional simulation improves the results and enables to compute the thickness variation of the plate at the end of the quench process. [less ▲]

Detailed reference viewed: 63 (12 ULg)
Full Text
Peer Reviewed
See detailInvestigation of the efficiency of the Ti555 compared with TA6V alloy in the case of an aeronautic application
Ben Bettaieb, Mohamed ULg; Van Hoof, T.; Zhang, Lihong ULg et al

in The 12th World Conference on Titanium Ti-2011 (2011)

Detailed reference viewed: 21 (6 ULg)
Full Text
Peer Reviewed
See detailExperimental characterization and constitutive modeling of TA6V mechanical behavior in plane strain state at room temperature
Gilles, Gaëtan ULg; Tuninetti Vásquez, Victor ULg; Ben Bettaieb, Mohamed ULg et al

in AIP Conference Proceedings (2011), 1383

This paper presents an experimental and theoretical study of the quasi-static behavior of TA6V titanium alloy in plane strain state. In order to quantify the anisotropy of the material, tests were carried ... [more ▼]

This paper presents an experimental and theoretical study of the quasi-static behavior of TA6V titanium alloy in plane strain state. In order to quantify the anisotropy of the material, tests were carried out at room temperature on specimens cut out from a sheet along three loading directions. The initial yield locus is described by the phenomenological CPB06ex3 criterion and Voce’s type isotropic hardening is used. Finite element simulations are performed and compared with the experiments. [less ▲]

Detailed reference viewed: 65 (37 ULg)
Full Text
See detailExperimental investigations of the material behavior of Ti6Al4V titanium alloy
Rossi, Barbara ULg; Gilles, Gaëtan ULg; Zolotas, Eric et al

Report (2011)

Computer models are widely used to support the development of conventional design methods based on expensive full-scale tests or trial and error methods. Nevertheless, in order to accurately model metal ... [more ▼]

Computer models are widely used to support the development of conventional design methods based on expensive full-scale tests or trial and error methods. Nevertheless, in order to accurately model metal forming processes as well as structural behavior of load carrying elements, it is necessary to afford an accurate knowledge of the material properties. Titanium is one of the material for which various industrial sectors such as aerospace or biomedical are showing an increasing interest. This paper presents the experimental tests performed on the titanium based alloy Ti6Al4V to investigate on its mechanical behavior, especially in terms of its anisotropy and hardening. For that purpose, a classical uniaxial and a non-standard biaxial experimental equipments designed by Florès in the Materials and Structures Mechanics Laboratory of the University of Liège have been used to perform tensile, simple shear and cyclic shear tests as well as successive simple shear and plane strain tests, which provide the main contribution of this paper in the form of stress-strain curves. [less ▲]

Detailed reference viewed: 52 (10 ULg)
Full Text
Peer Reviewed
See detailTransient yielding during compression tests on ECAP’ed AA1050 Aluminium
Verlinden, Bert; Chen, Enze; Duchene, Laurent ULg et al

in Materials Science Forum (2011), 667-669

In most papers dealing with tension and/or compression tests, the conventional yield stress is determined either by an offset method (usually 0.2% strain) or by back extrapolation from the stress-strain ... [more ▼]

In most papers dealing with tension and/or compression tests, the conventional yield stress is determined either by an offset method (usually 0.2% strain) or by back extrapolation from the stress-strain curve. In our experiments on ECAP‟ed Aluminium a transient hardening saturation (THS) is always observed during the compression tests, but not during the tensile tests. This THS occurs at a significantly lower stress than the conventional yield stress. The aim of the present paper is to determine which the “real” start of yielding is. Two different experimental approaches have been adopted, confirming that the THS stage is exactly the yielding stage. This is not unimportant because it increases the tension-compression asymmetry and hence the back-stress and kinematic hardening. The reason for this different behaviour between tension and compression can be ascribed to a different change in strain path with respect to the ECAP deformation. [less ▲]

Detailed reference viewed: 42 (7 ULg)
Full Text
Peer Reviewed
See detailPrediction of the Tension/Compression asymmetry of ECAP processed FCC material using an integrated model based on dislocation and back-stress
Chen, Enze; Duchene, Laurent ULg; Habraken, Anne ULg et al

in Materials Science Forum (2011), 667-669

In our recent work, a new integrated model was proposed to describe the back-stress evolution based on the dislocation substructure and texture. By relating the back-stress to the dislocation density in ... [more ▼]

In our recent work, a new integrated model was proposed to describe the back-stress evolution based on the dislocation substructure and texture. By relating the back-stress to the dislocation density in cell walls and in the cell interior, this model is able to capture the back-stress evolution of ECAP processed pure aluminium. In this paper, the model is used for another FCC material, namely copper. The aim is to check whether this model is able to predict the tension/compression asymmetry (due to the back-stress) of copper. The results show that this is indeed the case and it is also found that the strain rate ratio proposed in our previous work [1] is a function of the dislocation density ratio. [less ▲]

Detailed reference viewed: 30 (5 ULg)
Full Text
Peer Reviewed
See detailModeling the vertical spincasting of large bimetallic rolling mill rolls
Studer, Léo ULg; Detrembleur, Sylvain ULg; Dewals, Benjamin ULg et al

in Key Engineering Materials [=KEM] (2010, June), 443

In order to take into account the dynamic effects of molten metal during solidification, a methodology is presented to interface a metal solidification solver (coupled thermal mechanical metallurgical ... [more ▼]

In order to take into account the dynamic effects of molten metal during solidification, a methodology is presented to interface a metal solidification solver (coupled thermal mechanical metallurgical finite elements solver) with a specifically developed flow dynamics solver. (flow dynamics and thermics finite volume solver) The numerical set of tools is designed to be used for the simulation of bimetallic hot rolling mill rolls vertical spincasting. Modeling the industrial process for these products imply certain specifications on the numerical methods used, mainly due to the size of the geometrical domain, low Rossby & Ekman numbers, and a high Reynolds number. [less ▲]

Detailed reference viewed: 69 (19 ULg)
Full Text
Peer Reviewed
See detailModeling of Crack Propagation in Weld Beam-to-Column Connection Submitted to Cyclic Loading with Cohesive Zone Model
Lequesne, Cédric ULg; Plumier, André ULg; Duchene, Laurent ULg et al

in Journal of ASTM International (2010), 7(5),

During the earthquakes in Japan and California in the 1990s, cracks appeared in some weld beam-to-column connections of heavy rigid frame steel buildings. This prompted the necessary assessment of the ... [more ▼]

During the earthquakes in Japan and California in the 1990s, cracks appeared in some weld beam-to-column connections of heavy rigid frame steel buildings. This prompted the necessary assessment of the performance of weld connections in terms of rotation capacity and crack propagation. In the present study, experimental tests were performed where weld connections were submitted to cyclic loadings with increasing amplitude until a macro crack event was reached. However the crack phenomenon depends on many parameters: the geometry, the material, the welding process…. For this reason, it was interesting to develop a finite element modeling of these connections in order to complete these experiments and perform a parametric study. This paper describes the finite element model development, its material parameter identification and its comparison with experimental results. The weld connections were modeled by using three-dimensional mixed solid elements. The constitutive laws applied were elastoplastic with isotropic hardening identified for the base metal and the weld metal. Crack propagation was modeled by a cohesive zone model. The parameters of this cohesive zone model were identified by an inverse method with the modeling of three point bending tests of precracked samples performed on the base and weld metals. The fatigue damage generated by the cyclic loading was computed by the fatigue continuum damage model of Lemaitre and Chaboche, which was coupled with the cohesive zone model. [less ▲]

Detailed reference viewed: 140 (28 ULg)
Full Text
Peer Reviewed
See detailTemperature wrinkling prediction in metal/polymer multilayer coatings
Zhang, Lihong ULg; Ben Bettaieb, Amine ULg; Habraken, Anne ULg et al

in International Journal of Material Forming (2010, April), 3(supplement 1), 559-562

Two modeling approaches, analytical and numerical ones were carried out to simulate the mechanical behaviour of a coated metal steel sheet under thermo-mechanical loads. As the metallic film and the ... [more ▼]

Two modeling approaches, analytical and numerical ones were carried out to simulate the mechanical behaviour of a coated metal steel sheet under thermo-mechanical loads. As the metallic film and the polymer layer have different dilatation coefficients, temperature increase and/or humidity variation can result in a compressive state in the metallic film, and yield to bucking. This phenomenon is called wrinkling. It can be prevented by a stiff polymer layer or a stable film due to adapted thickness and mechanical properties. Wrinkling phenomenon has received increasing attention because of important uses of polymeric coating in many industrial applications. To better understand and predict this phenomenon, analytical and numerical models have been developed and compared. [less ▲]

Detailed reference viewed: 106 (36 ULg)
Full Text
Peer Reviewed
See detailInfluence of Surface Effect On Nickel Micro Deep Drawing Process
Keller, Clément ULg; Afteni, Mitica; Banu, Mihaela et al

in Proceeding of the Numiform 2010 conference (2010)

Detailed reference viewed: 55 (14 ULg)
Full Text
Peer Reviewed
See detailSimulation of bending process of hardening metallic sheets using damage model. Part II: Numerical investigations
Ben Bettaieb, Mohamed ULg; Lemoine, Xavier; Duchene, Laurent ULg et al

in Materials Science & Engineering : A (2010), 528(1), 442-448

In the first part of this paper, the theoretical aspects and the algorithmic developments related to the construction of the PBST (Pure Bending Simulation Tool) were provided. In this second part, this ... [more ▼]

In the first part of this paper, the theoretical aspects and the algorithmic developments related to the construction of the PBST (Pure Bending Simulation Tool) were provided. In this second part, this tool is used to simulate the pure bending process. The sensitivity of the bendability prediction to certain mechanical properties and phenomena (such as initial porosity and hardening parameters) is investigated by means of a parametric study. The efficiency and the performance of this tool (in terms of accuracy and computation time) compared to the FE method are shown through various numerical simulations. [less ▲]

Detailed reference viewed: 47 (13 ULg)
Full Text
Peer Reviewed
See detailSimulation of bending process of hardening metallic sheets using damage model. Part I: Theoretical development and numerical implementation.
Ben Bettaieb, Mohamed ULg; Lemoine, Xavier; Duchene, Laurent ULg et al

in Materials Science & Engineering : A (2010), 528(1), 434-441

This paper deals with the pure bending of thin and thick metallic sheets under plane strain condition. Its main objective is to construct an efficient, robust, incremental numerical tool that can be used ... [more ▼]

This paper deals with the pure bending of thin and thick metallic sheets under plane strain condition. Its main objective is to construct an efficient, robust, incremental numerical tool that can be used to simulate the bending process and predict the sheets’ bendability. In this investigation, the material constitutive law describing the mechanical behavior of the sheet is defined by an extended Gurson model. This model generalizes Gurson's original one to account for both plastic anisotropy and mixed (isotropic and kinematic) hardening of the matrix. In this model, only the growth phase of voids was considered (without taking into account nucleation). Here, the extended model was coupled with the kinematics of the pure bending process and with the equilibrium equations, and then implemented in an incremental numerical tool in order to predict the bendability of the sheets studied. This bendability was then verified using two different criteria. Part I of this paper focuses on the constitutive law, fulfillment of the force equilibrium, the thickness evolution and the shift of the neutral fiber, together with a comparison and discussion of the choices made by other authors regarding these parameters. The validation of the model developed in this paper will be carried out in Part II through simulations of the pure bending process. [less ▲]

Detailed reference viewed: 46 (16 ULg)
Full Text
Peer Reviewed
See detailMultiscale modeling of back-stress evolution in equal-channel angular pressing: from one pass to multiple passes
Chen, E.; Duchene, Laurent ULg; Habraken, Anne ULg et al

in Journal of Materials Science (2010), 45(17), 4696-4704

Fine-grained materials produced by equalchannel angular pressing (ECAP) exhibit kinematic hardening due to the existence of a back-stress. This article presents a new dislocation-based model, which is ... [more ▼]

Fine-grained materials produced by equalchannel angular pressing (ECAP) exhibit kinematic hardening due to the existence of a back-stress. This article presents a new dislocation-based model, which is able to describe the tension/compression asymmetry of the ECAP processed commercial purity aluminum. By introducing strain relaxation, and relating the back-stress to the inhomogeneous dislocation density distribution in cell walls and in cell interiors, the model can accurately predict the evolution of the dislocation densities, the cell size, and the back-stress. Compared to the other back-stress models, it takes into account the microstructure evolution and gives a better prediction. [less ▲]

Detailed reference viewed: 26 (9 ULg)
Full Text
Peer Reviewed
See detailAccurate stress computation in plane strain tensile tests for sheet metal using experimental data
Flores, P.; Tuninetti Vásquez, Victor ULg; Gilles, Gaëtan ULg et al

in Journal of Materials Processing Technology (2010), 210

Detailed reference viewed: 83 (41 ULg)
Full Text
Peer Reviewed
See detailEffect of a decrease in sample dimensions on plasticity: application to the micro-forming of nickel
Keller, Clément ULg; Afteni, Mitica; Banu, M. et al

in Steel Research International (2010), 81(9), 1173-1177

The mechanical behavior of polycrystalline nickel is investigated in tension as a function of the dimensions. Experimental tests and finite element simulations with a crystalline plasticity code are ... [more ▼]

The mechanical behavior of polycrystalline nickel is investigated in tension as a function of the dimensions. Experimental tests and finite element simulations with a crystalline plasticity code are carried out for samples with thicknesses ranging between 12.5 μm and 3.2 mm and grain size around 100 μm. Results show three different kinds of behavior depending on the number of grains across the thickness due to the apparition of stress and dislocation density gradients. Bulge tests are then used to study the formability of nickel polycrystals with thickness lower than 400 μm. [less ▲]

Detailed reference viewed: 76 (14 ULg)
Full Text
Peer Reviewed
See detailMiniaturization induced size effects: Experimental and numerical investigation of size effects linked to the miniaturization of metallic components
Keller, Clément ULg; Habraken, Anne ULg; Hug, E. et al

in Scale transition for plastic crystalline and microstructured materials: from experiment to numerical modeling (2010)

The manufacturing of small metallic components for MEMS is a great challenge for industries. However, the lack of knowledge about the mechanical behavior of metals when they are employed in small ... [more ▼]

The manufacturing of small metallic components for MEMS is a great challenge for industries. However, the lack of knowledge about the mechanical behavior of metals when they are employed in small components can reduce the economical development of MEMS due to manufacturing and reliability issues. The objective of this work is to provide new scientific results to improve the understanding of the mechanical properties of micro-components. Experimental and numerical (strain gradient plasticity model) tensile tests are performed on thin nickel single crystals and polycrystals (thickness larger than 10 m) showing different size effects depending on the dimensions of the samples. These effects are then taken into account in new simplified numerical models for the prediction of micro-forming processes. [less ▲]

Detailed reference viewed: 65 (13 ULg)
Peer Reviewed
See detailInfluence of Surface Effect on Nickel Micro Deep Drawing Process
Keller, Clément ULg; Afteni, Mitica; Banu, M. et al

in NUMIFORM 2010, VOLS 1 AND 2 (2010)

Detailed reference viewed: 34 (7 ULg)