https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Sun, 10 May 2026 08:53:17 GMT 2026-05-10T08:53:17Z http://hdl.handle.net/10985/8600 Simplified numerical approach for incremental sheet metal forming process BEN AYED, Lanouar; ROBERT, Camille; DELAMEZIERE, Arnaud; NOUARI, Mohammed; BATOZ, Jean-Louis The current work presents a finite element approach for numerical simulation of the incremental sheet metal forming (ISF) process, called here ‘‘ISF-SAM’’ (for ISF-Simplified Analysis Modelling). The main goal of the study is to develop a simplified FE model sufficiently accurate to simulate the ISF process and quite efficient in terms of CPU time. Some assumptions have been adopted regarding the constitutive strains/stresses equations and the tool/sheet contact conditions. A simplified contact procedure was proposed to predict nodes in contact with the tool and to estimate their imposed displacements. A Discrete Kirchhoff Triangle shell element called DKT12, taking into account membrane and bending effects, has been used to mesh the sheet. An elasto-plastic constitutive model with isotropic hardening behaviour and a static scheme have been adopted to solve the nonlinear equilibrium equations. Satisfactory results have been obtained on two applications and a good correlation has been shown compared to experimental and numerical results, and at the same time a reduction of CPU time more than 60% has been observed. The bending phenomenon studied through the second application and the obtained results show the reliability of the DKT12 element. Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/10985/8600 2014-01-01T00:00:00Z BEN AYED, Lanouar ROBERT, Camille DELAMEZIERE, Arnaud NOUARI, Mohammed BATOZ, Jean-Louis The current work presents a finite element approach for numerical simulation of the incremental sheet metal forming (ISF) process, called here ‘‘ISF-SAM’’ (for ISF-Simplified Analysis Modelling). The main goal of the study is to develop a simplified FE model sufficiently accurate to simulate the ISF process and quite efficient in terms of CPU time. Some assumptions have been adopted regarding the constitutive strains/stresses equations and the tool/sheet contact conditions. A simplified contact procedure was proposed to predict nodes in contact with the tool and to estimate their imposed displacements. A Discrete Kirchhoff Triangle shell element called DKT12, taking into account membrane and bending effects, has been used to mesh the sheet. An elasto-plastic constitutive model with isotropic hardening behaviour and a static scheme have been adopted to solve the nonlinear equilibrium equations. Satisfactory results have been obtained on two applications and a good correlation has been shown compared to experimental and numerical results, and at the same time a reduction of CPU time more than 60% has been observed. The bending phenomenon studied through the second application and the obtained results show the reliability of the DKT12 element. http://hdl.handle.net/10985/6739 Contraintes et potentialités du procédé innovant FSW pour la reconception de produit CROUE, Jean-Baptiste; DELAMEZIERE, Arnaud; MARTIN, Patrick; ZIMMER-CHEVRET, Sandra; LANGLOIS, Laurent Le procédé de soudage FSW est un procédé relativement récent dont le premier brevet date de 1991. Ses principaux avantages proviennent du fait qu’il permet de réaliser des soudures à l’état solide de proche en proche. Ceci lui permet d’assembler des pièces de géométrie complexes dans des alliages difficiles à souder par fusion. Toutefois le principe physique et technologique du procédé est très différent de celui des procédés de soudage par fusion. Notamment, la soudure est obtenue par l’action mécanique d’un outil en interaction avec la matière à souder. Pour évaluer la pertinence et le gain potentiel d’une soudure FSW par rapport à une soudure conventionnelle à l’arc une étape de reconception détaillée des pièces en intégrant les potentialités et lescontraintes du FSW est nécessaire. Dans cet article est présentée une première contribution à la mise en place d’un processus de reconception de produit en intégrant le potentiel du FSW. Ce travail, à partir d’une étude de cas s’appuie sur l’identification des contraintes et des potentiels du FSW et leur intégration dans le processus de fabrication de la pièce et l’évaluation des performances et du coût de la pièce. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10985/6739 2012-01-01T00:00:00Z CROUE, Jean-Baptiste DELAMEZIERE, Arnaud MARTIN, Patrick ZIMMER-CHEVRET, Sandra LANGLOIS, Laurent Le procédé de soudage FSW est un procédé relativement récent dont le premier brevet date de 1991. Ses principaux avantages proviennent du fait qu’il permet de réaliser des soudures à l’état solide de proche en proche. Ceci lui permet d’assembler des pièces de géométrie complexes dans des alliages difficiles à souder par fusion. Toutefois le principe physique et technologique du procédé est très différent de celui des procédés de soudage par fusion. Notamment, la soudure est obtenue par l’action mécanique d’un outil en interaction avec la matière à souder. Pour évaluer la pertinence et le gain potentiel d’une soudure FSW par rapport à une soudure conventionnelle à l’arc une étape de reconception détaillée des pièces en intégrant les potentialités et lescontraintes du FSW est nécessaire. Dans cet article est présentée une première contribution à la mise en place d’un processus de reconception de produit en intégrant le potentiel du FSW. Ce travail, à partir d’une étude de cas s’appuie sur l’identification des contraintes et des potentiels du FSW et leur intégration dans le processus de fabrication de la pièce et l’évaluation des performances et du coût de la pièce. http://hdl.handle.net/10985/6797 Comparison between incremental deformation theory and flow rule to simulate sheet-metal forming processes ROBERT, Camille; DELAMEZIERE, Arnaud; DAL SANTO, Philippe; BATOZ, Jean-Louis Numerical simulation of the deep drawing process for the manufacture of aeronautical or automotive components should predict with good accuracy the behaviour during the forming operation, taking into account, the material and the process parameters. Existing simulation strategies give good results, however calculation time are long due to the high degree of non-linearities of these problems. The objective of this work is therefore to decrease the calculation time, resulting from the non-linear material behaviour. A new algorithm based on incremental deformation theory (related to Hencky Theory) is presented, in order to compute the plasticity rule in a finite element code (ABAQUS). This algorithm is used to simulate two sheet-metal forming processes: typical stretch forming operation and incremental single point sheet forming. For each case the new algorithm is compared with a classical flow rule plasticity law. In order to have a valid comparison in terms of CPU time, the two material behaviour laws have been implemented in ABAQUS EXPLICIT using the material user function (VUMAT). Good agreement in terms of the stress state and thickness distribution is obtained with the new approach. A significant decrease in CPU time is observed when the major source of non-linearity comes from the material behaviour. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10985/6797 2012-01-01T00:00:00Z ROBERT, Camille DELAMEZIERE, Arnaud DAL SANTO, Philippe BATOZ, Jean-Louis Numerical simulation of the deep drawing process for the manufacture of aeronautical or automotive components should predict with good accuracy the behaviour during the forming operation, taking into account, the material and the process parameters. Existing simulation strategies give good results, however calculation time are long due to the high degree of non-linearities of these problems. The objective of this work is therefore to decrease the calculation time, resulting from the non-linear material behaviour. A new algorithm based on incremental deformation theory (related to Hencky Theory) is presented, in order to compute the plasticity rule in a finite element code (ABAQUS). This algorithm is used to simulate two sheet-metal forming processes: typical stretch forming operation and incremental single point sheet forming. For each case the new algorithm is compared with a classical flow rule plasticity law. In order to have a valid comparison in terms of CPU time, the two material behaviour laws have been implemented in ABAQUS EXPLICIT using the material user function (VUMAT). Good agreement in terms of the stress state and thickness distribution is obtained with the new approach. A significant decrease in CPU time is observed when the major source of non-linearity comes from the material behaviour.