Simplified numerical approach for incremental sheet metal forming process

Lanouar Ben Ayed (1) , Camille Robert (2) , Arnaud Delamézière (1) , Mohammed Nouari (1) , Jean-Louis Batoz (3)

1 LEMTA - Laboratoire d'Energétique et Mécanique Théorique et Appliquée
2 LAMPA - Laboratoire Angevin de Mécanique, Procédés et InnovAtion
3 AVENUES - AVENUES

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.

Mots clés: Incremental sheet forming; Simplified analysis modelling; Shell element DKT12

Domaines: Génie des procédés

Lanouar Ben Ayed, Camille Robert, Arnaud Delamézière, Mohammed Nouari, Jean-Louis Batoz. Simplified numerical approach for incremental sheet metal forming process. Engineering Structures, 2014, 62-63, pp.75-86. ⟨10.1016/j.engstruct.2014.01.033⟩. ⟨hal-01067055⟩