WorldCat Identities

Mabrouki, Tarek

Overview
Works: 26 works in 34 publications in 2 languages and 46 library holdings
Roles: Other, Thesis advisor, Opponent, Author, Contributor
Publication Timeline
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Most widely held works by Tarek Mabrouki
Vers une modélisation physique de la coupe des aciers spéciaux : intégration du comportement métallurgique et des phénomènes tribologiques et thermiques aux interfaces by Cédric Courbon( Book )

2 editions published in 2011 in French and held by 3 WorldCat member libraries worldwide

Nowadays, in a context of globalization, companies are submitted to unprecedented economic constraints. To remain competitive, they are forced to change their way of designing and innovating. Manufacturing is directly concerned with in mind to reduce the development steps necessary to define the optimal processing parameters. A need of flexible and predictive support tools is clearly rising in order to limit the experimental campaigns and make easier their exploitation. The numerical simulation appears as a relevant tool that match these criteria. This work is a contribution to an approach which aims at improving the modeling and simulation of machining operations, and on a more local scale, the modeling of metal cutting. It therefore addresses a complex and tightly coupled problem, involving mechanics, thermal sciences, metallurgy and tribology in extreme conditions. A first experimental part was thus directed towards a more sophisticated understanding of the cutting mechanisms occuring in machining of a normalized AISI 1045 and a quenched and tempered AISI 4140. It made possible to highlight, in the main intensive deformation zones, drastic grain refinements produced by the activation of dynamic recrystallization (DRX). Inspection of the tool-material contact areas also showed the strong heterogeneities of contact existing at the tool-chip interface, revealing the formation of a thermal contact resistance. A rheological study of these two grades was based on dynamic compression tests. Conducted at high strain, it reproduced the microstructural changes observed in cutting and enabled to understand their influence on the flow stress of both materials. Two "metallurgy based" models have been identified, leading to a better description of the material behaviour than standard phenomenological models. Special tribological tests have been conducted and analyzed to extract contact models able to reproduce local phenomena existing at the tool-material interface. The study has especially been focused on the thermal contact through heat partition models including the concept of thermal contact resistance. The proposed constitutive and contact models were finally implemented in a finite element code Abaqus© thanks to some specific developments. A modeling strategy has been developed around a 2D cutting model in order to simulate the major trends observed during the cutting of the mentioned steels. The combination of 2D and 3D continuous chip models, 2D segmented models and uncoupled thermal simulations appears as promising to model the different aspects of a machining operation
Développement d'un modèle numérique sur l'étude de l'intégrité des surfaces en perçage by Mathieu Girinon( )

2 editions published in 2017 in French and held by 3 WorldCat member libraries worldwide

L'intégrité de surface a un rôle significatif sur la tenue en fatigue des composants usinés. Des spécifications particulières émergent de la part des fabricants et particulièrement de ceux de l'aéronautique. Les trous percés sont des zones critiques à partir desquelles des endommagements peuvent se produire. Néanmoins les contraintes résiduelles sont peu étudiées en perçage. Elles émanent de phénomènes multi-physiques issus de l'opération de perçage difficilement identifiables à cause du confinement du trou. Ce rapport présente les travaux expérimentaux et numériques mis en œuvre au cours de la thèse. Le projet s'est d'abord focalisé autour de l'identification des phénomènes physiques mis en jeu pendant l'opération de perçage pour différents modes de lubrification et sur l'analyse des contraintes résiduelles sur la surface du trou percé. Ce premier volet expérimental a posé les bases de compréhension nécessaires au développement des modèles numériques.Les développements numériques s'articulent autour de deux axes. Le premier consiste à représenter l'opération de perçage. L'état de l'art ainsi qu'une étude préalable ont permis d'identifier les difficultés liées à la modélisation numérique d'une opération de perçage pour des longueurs percées significatives. Le premier modèle développé répond à cette problématique et détermine les sollicitations induites par le perçage nécessaires au calcul des contraintes résiduelles. Le deuxième axe de développement numérique permet de prédire les contraintes résiduelles présentes dans une pièce percée à partir des chargements issus du premier modèle
Effects of rolling ball tool parameters on roughness, sheet thinning, and forming force generated during SPIF process by Lassaad Kilani( )

1 edition published in 2020 in English and held by 2 WorldCat member libraries worldwide

Elaboration of concepts and methodologies to study peripheral down-cut miling process from macro-to-micro scales = Elaboration de concepts et méthodologies pour l'étude du fraisage de profil lors du passage d'échelles macro-micro by Muhammad Asad( Book )

2 editions published in 2010 in English and held by 2 WorldCat member libraries worldwide

Aujourd'hui, la méthode des éléments finis est suffisamment développée pour apporter aux ingénieurs, une aide indispensable lors des étapes de conception et d'optimisation des produits manufacturés. Dans certains cas, cette aide dépasse la simple assistance technologique et permet de considérer des lois physiques dans l'intimité d'un milieu inaccessible aux expériences (fission et fusion nucléaire, propagation des fissures dans les matériaux,...). C'est dans ce contexte à la fois scientifique et technologique que porte notre contribution sur la formation du copeau. D'un point de vue applicatif et expérimental, notre étude est centrée sur l'usinage de l'alliage d'Aluminium A2024-T351. Cette étude a été accomplie avec 4 étapes principales. La première étape porte sur la mise au point d'un modèle numérique 2D, de coupe orthogonale en tournage. Ce travail permet de choisir des solutions de détails pour ce modèle numérique, aussi bien au niveau de la discrétisation et de la partition du maillage qu'au niveau du comportement du matériau usiné sur les aspects cruciaux d'endommagement et d'énergie de rupture. Lors de la deuxième étape ce modèle a été adapté au cas du fraisage de profil en avalant avec un angle d'hélice nul, où la matière susceptible d'être enlevée a une forme en demi lune, constant sur sa largeur, présente une épaisseur continûment variable et tendant vers zéro. Ce travail et les résultats obtenus permettent de distinguer la zone de coupe macroscopique de la zone microscopique à partir de l'épaisseur coupée. L'effet de taille bien connu en micromécanique a ainsi été retrouvé lors de ce passage macro-micro à travers l'influence de l'écrouissage due à la vitesse de déformation du matériau. Le phénomène bien connu expérimentalement de l'augmentation quasi exponentielle de l'énergie spécifique de coupe avec la diminution de l'épaisseur coupée a été étudié en relation avec les divers aspects de cet effet de taille. Pour faciliter l'exploitation et proposer un outil de compréhension physique de l'enlèvement de matière à la communauté scientifique et à l'industrie, dans une troisième étape, le modèle de comportement de « Johnson-Cook » modifié par une approche basée sur le second gradient de déformation a été développé dans ABAQUS®/EXPLICIT sous la forme d'un sous programme (ou sous-routine VUMAT). Finalement, au cours de la quatrième étape, l'application a été complètement développée pour simuler le fraisage de profil en avalant, de l'alliage d'Aluminium A2024-T351. En plus de l'effet de taille interne au copeau, les aspects dynamiques liés au comportement du système usinant ont été pris en compte à travers un modèle multi-échelle nommé « modèle dynamique hybride de coupe (HDC-modèle) » qui combine la rigidité équivalente d'une fraiseuse à grande vitesse (outil, porte-outil, broche, ...) au niveau macroscopique avec la mécanique de formation de copeau au niveau mésoscopique. Cette application intégrant à la fois les effets d'échelles a pour but de fournir des données numériques sur la surface usinée qui puissent être comparées à des résultats expérimentaux. Malgré les difficultés de modélisation nous avons tenu à élaborer ce modèle complet car c'est bien la partie microscopique de la coupe en dynamique haute fréquence ou grande vitesse qui génère la surface usinée. Pour finir, des coupes expérimentales ont été exécutées en tournage et en fraisage pour valider les modèles proposés. Les résultats numériques sont ainsi comparés à ceux expérimentaux à chacune des étapes. De manière générale la concordance des résultats est bonne. Il faut cependant noter le grand nombre de paramètres des modèles numériques qui certains d'entre eux peuvent être des paramètres de recalage expérimental. Il apparaît donc que le caractère prédictif du modèle est limité essentiellement par les caractéristiques physiques de la matière usinée. On se retrouve dans la situation purement expérimentale des années 1970-80 qui a vu naître la notion de couple outil-matière (COM). L'approche d'aujourd'hui, à la fois expérimentale et numérique permet cependant de réduire fortement les coûts et de quantifier des phénomènes locaux très intéressants comme par exemple dans notre contribution : La propension à la segmentation et donc à la fragmentation dans certaines conditions de coupe, La longueur du contact copeau, face de coupe, l'amplitude des défauts de la surface usinée due à la dynamique globale
Analyse structurelle des composites tissés prenant en compte le procédé de mise en forme by Abderrahmen Aridhi( Book )

2 editions published in 2019 in French and held by 2 WorldCat member libraries worldwide

During the forming process, the woven fabric/prepreg can undergo large fiber rotations due to plane shear deformation. These rotations are mostly important in zones with complexe gometries such as double curvature. Therefore, the fiber reorientations in the new sheared fabric affects significantly the strength and performance of final product. The aim of this thesis work is to develop a constitutive model that taking into account the angle's between the weft and warp yarns. An hypoelastic model has been developed in order to simulate the forming of dry fabric. The forming simulation allows to determine the final reorientations between yarns through the shear angles. The later are transferred into an orthotropic elastic model, developed to perform a structural analysis of a cured composite after its forming. The orthotropic model has been validated by a tensile test on cured specimens after a bias extension test. Finally, to demonstrate the performance of this orthotropic model (taking into account the reorientation of yarns), FE analysis on cured hemisphere and double dome have been performed. The results obtained by the orthotropic model have been compared with those obtained from a model without taking into account the reorientation of yarns
EXPLORATION EXPERIMENTALE ET MODELISATION NUMERIQUE DES IMPACTS FLUIDIQUES : CONTRIBUTION A L'ETUDE DU DECAPAGE PAR JET D'EAU PURE HP by Tarek Mabrouki( Book )

2 editions published in 2000 in French and held by 2 WorldCat member libraries worldwide

LE PRESENT TRAVAIL CONSISTE A ETUDIER LA PHENOMENOLOGIE DE L'IMPACT FLUIDIQUE AU COURS D'UNE OPERATION DE DECAPAGE DES REVETEMENTS PAR JET D'EAU PURE HP. POUR CELA, NOUS AVONS CHOISI DEUX VOIES D'EXPLORATION. LA PREMIERE, EXPERIMENTALE, EST FONDEE SUR DES DEMARCHES D'INVESTIGATION UTILISANT DES MOYENS D'OBSERVATION DE L'ACTION D'UN JET SUR DES ECHANTILLONS A PEINTURES INDUSTRIELLES (RESINES EPOXYDIQUES) ET AERONAUTIQUES (A BASE POLYURETHANE). POUR CELA, NOUS AVONS CONCU UN MONTAGE EXPERIMENTAL QUI A POUR OBJECTIF LE SUIVI DE L'EVOLUTION DE L'IMPACT GENERE PAR UN JET ET L'EXPLORATION DE L'ENDOMMAGEMENT DU REVETEMENT QUI EN DECOULE. NOUS AVONS DEMONTRE QU'IL EXISTE UNE DISTANCE DE TIR A PARTIR DE LAQUELLE L'EFFICACITE DU DECAPAGE EST MAXIMALE. L'INFLUENCE DE QUELQUES PARAMETRES TELS QUE LA PRESSION ET LE TEMPS D'EXPOSITION ONT ETE EXAMINE. LES OBSERVATIONS MICROSCOPIQUES DES ECHANTILLONS NOUS ONT MONTRE L'INFLUENCE DE LA ZONE AUX ALENTOURS DE L'AXE D'UN JET NORMAL SUR LA MORPHOLOGIE DE L'IMPACT. IL APPARAIT NETTEMENT QUE CETTE ZONE GENERE DES CONTRAINTES DE CISAILLEMENT INTENSES PARTICIPANT A L'ENLEVEMENT DU REVETEMENT. EN PLUS DU PHENOMENE D'EROSION, L'ENDOMMAGEMENT DU REVETEMENT EST ACCELERE PAR DES MECANISMES DE FISSURATIONS, FAVORISANT AINSI LE DECOLLEMENT DE LA PEINTURE. PAR AILLEURS, VU LA DISPARITE DES REVETEMENTS TRAITES, DES ESSAIS DE CARACTERISATIONS CONCERNANT L'ARRACHEMENT DE LA PEINTURE SONT REALISES. LA DEUXIEME VOIE CONCERNE UNE ETUDE BASEE SUR UNE MODELISATION NUMERIQUE PAR ELEMENTS FINIS DE L'INTERACTION D'UN JET FLUIDE SUR L'ENSEMBLE REVETEMENT/SUBSTRAT ET CECI PAR L'INTERMEDIAIRE DU CODE DE CALCUL LS-DYNA. GRACE A CETTE DEMARCHE, NOUS AVONS PU SIMULER L'ACTION D'UN JET SUR UNE CIBLE REVETUE. EN SE BASANT SUR UN CRITERE D'EROSION NUMERIQUE, NOUS AVONS PU REPRODUIRE LA MORPHOLOGIE DE L'IMPACT TROUVE EXPERIMENTALEMENT. LA DISTRIBUTION DU CHAMP DE CONTRAINTE NOUS A PERMIS DE DETECTER LES ZONES PROBABLES DE L'INITIATION DE L'ENLEVEMENT DU REVETEMENT
Comparative assessment of cooling conditions, including MQL technology on machining factors in an environmentally friendly approach by Mourad Nouioua( )

1 edition published in 2017 in English and held by 2 WorldCat member libraries worldwide

Contribution à l'étude de l'intégrité des surfaces fonctionnelles induites par un procédé thermomécanique-mécanique combiné : rectification-galetage by Yasmine Charfeddine( Book )

2 editions published in 2020 in French and held by 2 WorldCat member libraries worldwide

Combining grinding with burnishing called “REGAL” is a newly developed outstanding technique consisting in grinding and burnishing operating simultaneously. The purpose behind this innovative approach is to enhance the surface integrity of the workpiece obtained by REGAL if compared to grinding and burnishing performing each one apart. REGAL process is made possible thanks to the design and manufacturing of a mechanical fixing system capable of maintaining the burnishing ball next to the grinding wheel. An automated control table is needed to make small and precise lateral feeds in order to ensure high surface recovery rates obtained by the ball burnishing tool. The most influential parameters of REGAL process were identified and their impacts on surface integrity were studied in terms of forces, roughness and residual stress results. The experimental results have shown that further from gaining time and energy by combining two processes in one, REGAL process enhances drastically the quality of the surface obtained if compared to workpiece surfaces obtained after grinding and burnishing acting separately. In addition, simultaneous grinding and burnishing introduces compressive residual stress results at the surface and beneath it reaching a deeper depth than the depth obtained by burnishing at the same manufacturing conditions thanks to the physicochemical changes obtained by the simultaneous thermomechanical/purely mechanical loads applied to the workpiece. 3D numerical simulations of grinding, burnishing and REGAL were also conducted to understand the physical phenomena occurring that is responsible of getting a more compressive residual stress layer obtained by REGAL if compared to burnishing acting separately and are in adequacy with the experimental results
Numerical and experimental investigations of post-machining distortions in thin machined structures considering material-induced residual stress by W. Saleem Awan( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

MOdélisation et Simulation de l'Usure des Outils de Coupe au cours du processus d'enlèvement de matière : Approche expérimentale et numérique (MOSUOC) by Mayssa Guediche( Book )

2 editions published in 2017 in French and held by 2 WorldCat member libraries worldwide

The quality of finished products is one of the most important concerns of manufacturers. In fact, surface integrity is strongly related to several machining parameters such as cutting conditions, environment and especially tool wear evolution. The latest has been the subject of many researches during last decades but the majority of them were based on experimental tests and still valid for restricted cutting conditions. The lack of efficient models to simulate tool wear is explained by the fact that it is a complicated phenomenon to deal with due to different origins it can result from (abrasion, diffusion, adhesion...). In this context, the main purpose of the proposed research work is to develop a Finite Element Model based on the commercial code ABAQUS© to simulate wear phenomenon of an uncoated tungsten carbide tool insert. The study focuses on the case of orthogonal cutting operation of AISI 4140 and studies the impacts of tool wear on final functional surface integrity. The developed cutting model is based on a lagrangian description of the mesh movement. A damageable zone in the workpiece is considered to simulate the chip formation. Since tool wear occurs after several minutes, a procedure to increase the machining time simulated, named “VErtical Modeling of CUTting” (VEMCUT), is developed. The wear occurred on tool insert is taken into account by the implementation of the Archard law in Abaqus. Wear depth values are computed on each node of tool surface then a procedure for tool nodes relocation is applied. Wear coefficient needed for calculation is determined via non-lubricated experimental wear tests
Design optimization for minimum technological parameters when dry turning of AISI D3 steel using Taguchi method by Oussama Zerti( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Modeling and optimization of hard turning of X38CrMoV5-1 steel with CBN tool: Machining parameters effects on flank wear and surface roughness by Hamdi Aouici( )

1 edition published in 2011 in English and held by 2 WorldCat member libraries worldwide

Numerical and experimental forming analyses of textile composite reiforcements based on a hypoelastic behaviour = alyse numérique et experimentale de la mise en forme des renforts de composite textiles basée sur un comportement hypoélastique = alyse numérique et experimentale de la mise en forme des renforts de composite textiles basée sur un comportement hypoélastique by Muhammad Aurangzeb Khan( Book )

2 editions published in 2009 in English and held by 2 WorldCat member libraries worldwide

Numerical simulations of the composite forming processes are essential in the design phase of composite structures. Fabric Forming simulations have many objectives: these determine the feasibility of forming or conditions of this feasibility and help determine the position of fibres after forming. This is important for the identification of mechanical characteristics of composites in service and to calculate the permeability after dry reinforcement draping for correct analysis of injection moulding process. This particular study has been accomplished with three main stages: the development of a stress computation algorithm for numerical analysis of fibrous materials; the experimental forming analysis of textile fabrics with an in-house development of double dome benchmark forming device; and finite element forming simulations using the benchmark model. Continuous approach has been used to predict the mechanical characteristics of woven composite fabrics during forming which considers the fibrous materials as a continuum on average at macroscopic scale. An algorithm based on a hypoelastic behaviour has been proposed for composite reinforcement forming simulations. It has been shown that using hypoelastic law with an objective derivative based on warp and weft fibre rotation tensors can successfully trace the correct behaviour of fibrous materials in deformation. The algorithm has been validated through a number of elementary tests with theoretical results. The de-facto standard in-plane shear tests of picture-frame and bias-extension have also been validated numerically. Double dome fabric forming tests have been carried out experimentally. 3D optical strain measurements were performed exploiting digital image correlation system of Vic-3D in order to measure the shear angles of the deformed fabrics. The forming simulations performed with the proposed numerical approach show a good agreement with the experimental results obtained with double dome device
Correction to: Modeling and optimization of the turning parameters of cobalt alloy (Stellite 6) based on RSM and desirability function by Riadh Saidi( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Développement d'une modélisation à l'échelle cristalline d'un alliage de titane pour la simulation de l'usinage by Houssem Ben boubaker( )

1 edition published in 2019 in French and held by 2 WorldCat member libraries worldwide

Titanium alloys, have seen their use increase in recent years due to their low density and good mechanical properties. However, because titanium alloys are hard-to-cut materials, their shaping by dry machining is often difficult. Hence, it is difficult to understand the mechanisms inducing the poor machinability of titanium alloys using only experimental tests. Performing numerical simulations is an alternative that can provide some access to local physical quantities and can improve the understanding of chip formation mechanisms. Most of numerical machining simulations are based on the hypothesis of isotropic and homogeneous material properties. These simulations provide an overall estimate of mechanical, thermal and tribological phenomena induced by machining operations. The main objective of this study is the development of a mechanical model adapted to the machining modelling of the Ti17 titanium alloy. Because of its high grain size, explicitly taking into account the microstructural heterogeneity is an essential part of the modelling strategy, which relies on the crystal plasticity framework. A homogenization law written on the local scale is used to consider the two-phases Ti17 microstructure. Thus, an identification procedure of the constitutive model parameters based on tensile, compression and shear tests is proposed. While the objective of this work is to develop a constitutive model at crystal scale, it is nevertheless necessary to characterize the behavior of the Ti17 titanium alloy. The viscoplastic behavior is studied using compression tests and then, the damage phenomena are investigated using tensile and shear tests. Finally, the model is mainly used to predict the impact of cutting parameters and microstructure on chip formation mechanisms
Modeling and optimization of the turning parameters of cobalt alloy (Stellite 6) based on RSM and desirability function by Riadh Saidi( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Effets du comportement de la machine et des paramètres d'usinage sur la topographie des surfaces obtenues par fraisage à grande vitesse avec des fraises à bout sphérique monoblocs by Rami Belguith( )

1 edition published in 2019 in French and held by 1 WorldCat member library worldwide

The optimization of the cutting parameters in high-speed machining requires the consideration of the machining errors in the modeling of the cutting forces and the surface topography. Therefore, the present study deals with the analysis of the effect of cutting parameters and machining errors on the surface topography of milled surfaces with a ball-end mill. The tool geometry was modeled taking into account all the machining errors such as runout, bending, vibrations and wear. Then, the Cutter Workpiece Engagement region 'CWE ', the cutting width and the uncut chip thickness were modeled taking into account the trace of the previous tooth. Subsequently, thermomechanical modeling of cutting forces in the milling process with a ball-end tool is made considering these errors. Finally, an analysis of the topography according to all these parameters and machining errors was carried out based on experimental validation
Caractérisation et modélisation de l'état mécanique et microstructural des sous-couches affectées par l'usinage de finition du cuivre Cu-c2 et impact sur la résistance à la corrosion. by Lamice Denguir( )

1 edition published in 2016 in French and held by 1 WorldCat member library worldwide

The functional performance and life of mechanical components in general and their corrosion resistance in particular are of prime importance in the modern industry, as far as energy production, transportation, machines, medical and even electronic components are concerned. In the case of machined components, it is essential to improve their life and to reduce the premature failure by improving their surface integrity. So, a comprehension of the effect of the machining process mechanics on surface integrity and its consequences on corrosion resistance are essential.This thesis deals with the particular case of finishing machining of oxygen free high conductivity copper (OFHC) and its impact on the surface integrity and corrosion resistance. Firstly, a comparative experimental study between turning and orthogonal cutting is performed. Then, due to its simplicity, orthogonal cutting makes the object of the pursuit of the study. A numerical model is developed to predict the surface integrity induced by the cutting process. It uses a new constitutive model for OFHC copper taking into account microstructural transformations and the state of stress in the work material. Finally, the results issued from experimental studies and the numerical simulations are statistically treated in a multi-physical analysis with the objective of establishing the relationship between corrosion resistance, surface integrity and cutting physics
 
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Alternative Names
Mabrouki T.

Маброуки Т.

Languages
French (15)

English (13)