References of "Duchene, Laurent"
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See detailPrediction of cracks within cones processed by single point incremental forming
Betaieb, Ehssen ULiege; Yuan, Sibo ULiege; Guzman, Carlos Felipe et al

Scientific conference (2019, April 16)

Plane stress tests such as tensile tests on smooth and notched samples as well as shear tests are used to identify the set of material parameters associated with two damage models: a micromechanically ... [more ▼]

Plane stress tests such as tensile tests on smooth and notched samples as well as shear tests are used to identify the set of material parameters associated with two damage models: a micromechanically-based Gurson model and a continuum Lemaitre and Chaboche model. Finite element simulations and inverse modelling are applied on these tests to characterize the mechanical behavior of a DC01 steel sheet. The capabilities of these two damage models to predict the maximum wall angle before failure of cones formed by single point incremental forming are analyzed, showing that the Lemaitre and Chaboche model appears to be more reliable when applied on this steel sheet. [less ▲]

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See detailOptimal use of high strength steel grades within bridge (OPTIBRI)
Habraken, Anne ULiege; Duchene, Laurent ULiege; Bouffioux, Chantal ULiege

Report (2019)

The project aims to generate guide lines for welded bridges using High Strength Steel. The quantification of the advantage of using HSS within bridges is performed on a 21.5 m wide highway bridge, with a ... [more ▼]

The project aims to generate guide lines for welded bridges using High Strength Steel. The quantification of the advantage of using HSS within bridges is performed on a 21.5 m wide highway bridge, with a typical 80 m long inner span and a composite steel-concrete twin plate girder deck. It presents clear fatigue and stability issues. An extensive experimental and numerical campaign of fatigue on HSS samples, welded plates and welded beams as well as an experimental and numerical study of multiaxial stressed plates allow a better understanding of HSS material and HSS welded joint behaviour with or without weld post treatment. The results enhance the need of an Eurocode review. Three designs of this bridge are compared: the first bridge design (A) uses only standard S355 steel grade whereas the second design (B) uses also HSS S690 QL steel but relies on current state of Eurocodes. Finally, the third design (C) is performed based on the real measured behaviour of HSS S690 QL steel and post treated welded joints. Through different variants of the design (C), the project results demonstrate the need of updating of Eurocode to take into account the enhanced material properties of HSS and the buckling of multiaxial stressed plates. The use of S690 QL in design B (C) enables reductions of steel weight of 25% (32%) on the steel deck and 34% (39%) on main girder compared to Design A and these designs save about 50% on full penetration welding volume compared to design A [less ▲]

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See detailThermal histories and microstructures in Direct Energy Deposition of a High Speed Steel thick deposit
Tomé Jardin, Ruben Antonio ULiege; Tchuindjang, Jérôme Tchoufack ULiege; Duchene, Laurent ULiege et al

in Materials Letters (2019), 236

The results of 2D Finite Element thermal simulations of Direct Energy Deposition of a High Speed Steel thick deposit explain the observed microstructural heterogeneities over the whole height of a 36 ... [more ▼]

The results of 2D Finite Element thermal simulations of Direct Energy Deposition of a High Speed Steel thick deposit explain the observed microstructural heterogeneities over the whole height of a 36-layer deposit. The Finite Element model is validated by the recorded substrate temperature and the melt pool depth of the last clad layer experimentally measured. The correlation between the computed thermal fields and the microstructures of three points of interest located at different depths within the deposit is carried out. The effect of both the melt superheating temperature and the thermal cyclic history on the carbides type, shape and size is discussed. [less ▲]

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See detailModélisation de l'endommagement de fluage-fatigue d'un alliage de Nickel pour récepteur solaire
Morch, Hélène ULiege; Duchene, Laurent ULiege; Habraken, Anne ULiege

Poster (2019, January 22)

Un modèle élasto-visco-plastique basé sur le modèle de Chaboche a été implémenté afin de modéliser le comportement de tubes en alliage de nickel utilisés dans les centrales solaires à tour. Pour pouvoir ... [more ▼]

Un modèle élasto-visco-plastique basé sur le modèle de Chaboche a été implémenté afin de modéliser le comportement de tubes en alliage de nickel utilisés dans les centrales solaires à tour. Pour pouvoir estimer la durée de vie des tubes, un modèle d’endommagement basé sur les travaux de Lemaitre a également été intégré au code. Ce modèle comprend deux types d’endommagement qui sont cumulés : l’endommagement de fluage, dont l’évolution suit le modèle de Kachanov, et l’endommagement de fatigue dont l’évolution suit le modèle d’endommagement unifié de Lemaitre. Le modèle a été vérifié à partir de données expérimentales issues de la littérature. [less ▲]

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See detailIdentification method of an advanced constitutive law for nickel-based alloy Haynes 230 used in solar receivers
Morch, Hélène ULiege; Duchene, Laurent ULiege; Habraken, Anne ULiege

in Journal of Physics. Conference Series (2018, August), 1063

A model to study panels of thin tubes of Haynes 230 nickel alloy used in solar receivers has been developed. The thermo-mechanical behavior of these tubes is simulated using an advanced model capable of ... [more ▼]

A model to study panels of thin tubes of Haynes 230 nickel alloy used in solar receivers has been developed. The thermo-mechanical behavior of these tubes is simulated using an advanced model capable of representing specific characteristics such as viscosity, kinematic and cyclic hardening, static recovery, or dynamic recovery. The constitutive law implemented is a finite-element visco-plastic model based on the work of Chaboche. Due to its complexity, the model uses a significant number of parameters that need to be identified at several temperatures. The aim of this article is to define an efficient method for the identification of the parameters of this Chaboche model adapted to cyclic thermo-mechanical loading. [less ▲]

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See detailA Novel Geometry for Shear Test Using Axial Tensile Setup
Yuan, Sibo ULiege; Duchene, Laurent ULiege; Milis, Olivier ULiege et al

in Proceedings (2018, July), 2

This paper studies a novel geometry for the in-plane shear test performed with an axial electromechanical testing machine. In order to investigate the influence of the triaxiality rate on the mechanical ... [more ▼]

This paper studies a novel geometry for the in-plane shear test performed with an axial electromechanical testing machine. In order to investigate the influence of the triaxiality rate on the mechanical behavior, different tests will be performed on the studied material: simple tensile tests, large tensile tests and shear tests. For the whole campaign, a common equipment should be employed to minimize the impact of the testing device. As a consequence, for the shear tests, the geometry of the specimen must be carefully designed in order to adapt the force value and make it comparable to the one obtained for the tensile tests. Like most of the existing shear-included tensile test specimens, the axial loading is converted to shear loading at a particular region through the effect of geometry. A symmetric shape is generally preferred, since it can restrict the in-plane rotation of the shear section, keep shear increasing in a more monotonic path and double the force level thanks to the two shear zones. Due to the specific experimental conditions, such as dimensions of the furnace and the clamping system, the position of the extensometer or the restriction of sheet thickness (related to the further studies of size effect at mesoscale and hot temperature), several geometries were brought up and evaluated in an iterative procedure via finite element simulations. Both the numerical and experimental results reveal that the final geometry ensures some advantages. For instance, a relatively low triaxiality in the shear zone, limited in-plane rotation and no necking are observed. Moreover, it also prevents any out-of-plane displacement of the specimen which seems to be highly sensitive to the geometry, and presents a very limited influence of the material and the thickness. [less ▲]

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See detail2D FE Simulations of High Speed Steel Laser Cladding Process
Tomé Jardin, Ruben Antonio ULiege; Tran, Hoang Son ULiege; Hashemi, Neda et al

Conference (2018, April 25)

A 2D Finite Element thermal model of Directed Energy Deposition (laser cladding) process of a High Speed Steel thick deposit is developed to explain the observed microstructural heterogeneities over the ... [more ▼]

A 2D Finite Element thermal model of Directed Energy Deposition (laser cladding) process of a High Speed Steel thick deposit is developed to explain the observed microstructural heterogeneities over the whole height of a 36-layer deposit. This model is validated with the substrate temperature and the melt pool depth of the last clad layer experimentally measured. The correlation of the computed thermal fields with the observed microstructures is carried out for four different deposit depths possessing different microstructures. A deeper understanding of the effect of the melt superheating temperature and the thermal cyclic history on carbide solidification is reached. [less ▲]

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See detailDamage prediction in single point incremental forming using an extended Gurson model
Guzman, Carlos Felipe; Yuan, Sibo ULiege; Duchene, Laurent ULiege et al

in International Journal of Solids and Structures (2018), 151

Single point incremental forming (SPIF) has several advantages over traditional forming, such as the high formability attainable by the material. Different hypotheses have been proposed to explain this ... [more ▼]

Single point incremental forming (SPIF) has several advantages over traditional forming, such as the high formability attainable by the material. Different hypotheses have been proposed to explain this behavior, but there is still no straightforward relation between the particular stress and strain state induced by SPIF and the material degradation leading to localization and fracture. A systematic review of the state of the art about formability and damage in SPIF is presented and an extended Gurson–Tvergaard–Needleman (GTN) model was applied to predict damage in SPIF through finite element (FE) simulations. The line test was used to validate the simulations by comparing force and shape predictions with experimental results. To analyze the failure prediction, several simulations of SPIF cones at different wall angles were performed. It is concluded that the GTN model underestimates the failure angle on SPIF due to wrong coalescence modeling. A physically-based Thomason coalescence criterion was then used leading to an improvement on the results by delaying the onset of coalescence. [less ▲]

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See detailVisco-plastic Chaboche model for nickel-based alloys under anisothermal cyclic loading
Morch, Hélène ULiege; Duchene, Laurent ULiege; Habraken, Anne ULiege

in Proceedings of the XIV International Conference on Computational Plasticity (2017, September)

The mechanical behavior of visco-plastic materials such as nickel-based alloys is highly dependent on temperature. Some characteristics such as viscosity, hardening, static recovery, dynamic recovery have ... [more ▼]

The mechanical behavior of visco-plastic materials such as nickel-based alloys is highly dependent on temperature. Some characteristics such as viscosity, hardening, static recovery, dynamic recovery have more or less influence on the overall behavior depending on the considered temperature. The unified constitutive model developed by Chaboche [1] is very efficient in representing this complexity as it is very adaptable and can contain many features. A basic Chaboche model contains a viscosity law and one or several hardening equations. Within these hardening equations, it is possible to add several features that will represent the complex behavior of the material. The aim of this study is to understand the role of the different parameters and the influence of the different features in an advanced Chaboche model adapted to cyclic anisothermal loading. This specific model was also developed in [2],[3]. However, part of this study is based on particular cases where different features of the model are analyzed [4]–[6]. [less ▲]

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See detail3D thermal finite element analysis of laser cladding processed Ti-6Al-4V part with microstructural correlations
Tran, Hoang Son ULiege; Tchuindjang, Jérôme Tchoufack ULiege; Paydas, Hakan ULiege et al

in Materials and Design (2017), 128

In this study, a 3D thermal model of laser cladding by powder injection applied to Ti-6Al-4V is developed. The manufactured part is made of a Ti-6Al-4V substrate on which successive layers of laser melted ... [more ▼]

In this study, a 3D thermal model of laser cladding by powder injection applied to Ti-6Al-4V is developed. The manufactured part is made of a Ti-6Al-4V substrate on which successive layers of laser melted powder are added, leading to a thick deposit. The computed temperature field and its time evolution are compared to experimental measurements. The temperature distribution in the substrate allows the prediction of the depths of the melt pool and the heat affected zone. Correlations between simulated thermal histories and the final microstructure in the thick deposit are established, leading to the enhancement of a dynamic shift of the critical transformation points due to high thermal rates during laser processing. The nature of the phases present within the deposit is discussed. [less ▲]

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See detailFATIGUE CRACK PROPAGATION IN HSS S690QL WELDED CONNECTIONS IN BRIDGES
Bouffioux, Chantal ULiege; Canales Cardenas, Cristian ULiege; Duchene, Laurent ULiege et al

Conference (2017, June)

The fatigue and crack study of HSS S690QL steel welded pieces is first experimentally analyzed by fatigue tests on small samples of Base Material (BM), Heat Affected Zone (HAZ) and Weld Metal (WM ... [more ▼]

The fatigue and crack study of HSS S690QL steel welded pieces is first experimentally analyzed by fatigue tests on small samples of Base Material (BM), Heat Affected Zone (HAZ) and Weld Metal (WM) separately for several stress ratios, stress levels, on smooth and notched samples. The Lemaître-Chaboche fatigue model combined with the stress gradient method and the three sets of parameters are found to accurately describe the behavior of each material. Another experimental campaign with larger pieces (closer to the scale of the bridge connections) called "small scale samples", with/without welded stiffeners, with several geometries and with/without post-treatment has shown each effect separately: the scale and machining effects, residual stresses due to the welding, geometrical and post-treatments effects. Numerical simulations of these experiments are used to improve and validate the material data, with a study in real context and size. Then, the characterized fatigue damage model is coupled with the element deletion method to model the propagation of cracks along the welded samples and the numerical predictions are compared with experimental results in order to validate the approach. [less ▲]

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See detailCharacterization of Fatigue Behaviour, from Material Science to Civil Engineering Applications
Bouffioux, Chantal ULiege; Habraken, Anne ULiege; Duchene, Laurent ULiege et al

Conference (2017, May 03)

Method used to characterise and numerically study the fatigue behaviour of HSS welded plates

Detailed reference viewed: 39 (10 ULiège)
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See detailOPTIBRI Opening and Project Overview
Habraken, Anne ULiege; Duchene, Laurent ULiege; Bouffioux, Chantal ULiege et al

Conference (2017, May 03)

presentation of genesis of the project, his goal and objectives, the partnership, the task flowchart and main achievements

Detailed reference viewed: 42 (7 ULiège)
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See detailOptimal use of High Strength Steel grades within bridge
Habraken, Anne ULiege; Duchene, Laurent ULiege; Bouffioux, Chantal ULiege et al

Diverse speeche and writing (2017)

The use of high strength steel in bridges is studied through the welding, the fatigue and the stability for three designs and also in term of life cycle impacts.

Detailed reference viewed: 63 (23 ULiège)
See detailLaser Cladding Finite Element Modelling Application to Ti6Al4V,
Tran, Hoang Son ULiege; Brusten, Romain; Jardin, Ruben et al

Conference (2016, November 03)

Corrélation entre les champs thermiques prédits et la microstructure observée.

Detailed reference viewed: 56 (16 ULiège)
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See detailQuasicontinuum analysis of interaction between screw dislocation and coherent twin boundary
Tran, Hoang Son ULiege; Duchene, Laurent ULiege; Tummala, Hareesh et al

Conference (2016, September 07)

The interaction between pure screw dislocation with dislocation line directions lying parallel to the twin plane and Coherent Twin Boundary Σ3 of copper has been studied using Quasi-Continuum method. The ... [more ▼]

The interaction between pure screw dislocation with dislocation line directions lying parallel to the twin plane and Coherent Twin Boundary Σ3 of copper has been studied using Quasi-Continuum method. The coherent twin boundary provides high barrier to slip transmission. The dislocation pile-up modifies the stress field at its intersection with the grain boundary. We introduce a methodology to calculate the stress barriers during slip–GB interaction. Screw dislocation approaching the boundary from one side may either propagate into the adjacent twin grain by cutting through the twin boundary. Quantitative estimation of critical stress for transmission phenomena is performed by using virial stress. The mechanism and critical stress obtained were in line with the literature. Such information can be used as input for Discrete Dislocation Dynamics models [less ▲]

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See detailModeling the ductile fracture and the plastic anisotropy of DC01 steel at room temperature and low strain rates
Tuninetti, Victor; Yuan, Sibo ULiege; Gilles, Gaëtan et al

Scientific conference (2016, September)

This paper presents different extensions of the classical GTN damage model implemented in a finite element code. The goal of this study is to assess these extensions for the numerical prediction of ... [more ▼]

This paper presents different extensions of the classical GTN damage model implemented in a finite element code. The goal of this study is to assess these extensions for the numerical prediction of failure of a DC01 steel sheet during a single point incremental forming process, after a proper identification of the material parameters. It is shown that the prediction of failure appears too early compared to experimental results. Though, the use of the Thomason criterion permitted to delay the onset of coalescence and consequently the final failure. [less ▲]

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See detailSimulation of a two-slope pyramid made by SPIF using an adaptive remeshing method with solid-shell finite element
Velosa De Sena, José ULiege; Guzmán Inostroza, Carlos Felipe ULiege; Duchene, Laurent ULiege et al

in International Journal of Material Forming (2016), 9(3), 259-434

Single point incremental forming (SPIF) is an emerging application in sheet metal prototyping and small batch production, which enables dieless production of sheet metal parts. This research area has ... [more ▼]

Single point incremental forming (SPIF) is an emerging application in sheet metal prototyping and small batch production, which enables dieless production of sheet metal parts. This research area has grown in the last years, both experimentally and numerically. However, numerical investigations into SPIF process need further improvement to predict the formed shape correctly and faster than current approaches. The current work aims the use of an adaptive remeshing technique, originally developed for shell and later extended to 3D “brick” elements, leading to a Reduced Enhanced Solid-Shell formulation. The CPU time reduction is a demanded request to perform the numerical simulations. A two-slope pyramid shape is used to carry out the numerical simulation and modelling. Its geometric difficulty on the numerical shape prediction and the through thickness stress behaviour are the main analysis targets in the present work. This work confirmed a significant CPU time reduction and an acceptable shape prediction accuracy using an adaptive remeshing method combined with the selected solid-shell element. The stress distribution in thickness direction revealed the occurrence of bending/unbending plus stretching and plastic deformation in regions far from the local deformation in the tool vicinity. [less ▲]

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See detailSingle point incremental forming simulation with adaptive remeshing technique using solid-shell elements
Sena, José; Lequesne, Cedric; Duchene, Laurent ULiege et al

in Engineering Computations International Journal for Computer- Aided Engineering and Software (2016), 33(5), 1388-1421

Numerical simulation of the single point incremental forming (SPIF) processes can be very demanding and time consuming due to the constantly changing contact conditions between the tool and the sheet ... [more ▼]

Numerical simulation of the single point incremental forming (SPIF) processes can be very demanding and time consuming due to the constantly changing contact conditions between the tool and the sheet surface, as well as the nonlinear material behaviour combined with non-monotonic strain paths. The purpose of this paper is to propose an adaptive remeshing technique implemented in the in-house implicit finite element code LAGAMINE, to reduce the simulation time. This remeshing technique automatically refines only a portion of the sheet mesh in vicinity of the tool, therefore following the tool motion. As a result, refined meshes are avoided and consequently the total CPU time can be drastically reduced. [less ▲]

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See detail3-D finite element analysis of laser cladding process. Application to Ti-6Al-4V
Tran, Hoang Son ULiege; Brusten, Romain; Paydas, Hakan ULiege et al

Scientific conference (2016, May 20)

In this study, a 3-D thermal numerical modelling of laser cladding by powder injection as a repair technology applied to Ti-6Al-4V was developed. In order to implement the movement of the heat source in ... [more ▼]

In this study, a 3-D thermal numerical modelling of laser cladding by powder injection as a repair technology applied to Ti-6Al-4V was developed. In order to implement the movement of the heat source in the model and the addition of material, a C++ programme was developed. Transition refinement elements are used to reduce the number of degrees of freedom. The temperature distribution and its time evolution were computed which allowed the prediction of the heat affected zone and the fusion size of the substrate. Effects of heat source distribution, energy input are investigated. Temperature measurements validate the model. [less ▲]

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