Numerical Investigation of the Limit Strains in Sheet Forming Involving Bending

Tudor Balan (1) , Farid Abed-Meraim (1)

1 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux

In this work, the finite element method is used to simulate a typical FLD test over tools of different radii. Parameters like the mesh density, element type, numerical determination of the onset of strain localization, limit strain definition etc. have been investigated. Finally, the limit strain for plane strain tension has been determined as a function of the thickness vs. tool radius (t/R) ratio. These simulations confirm that increasing the curvature of the tool increases the value of the limit strains. They also reveal that, as soon as bending becomes important, the practical relevance of the limit strains diminishes - At least with their current definition. The need for new strain localization models is emphasized, together with some of the associated challenges.

Mots clés: Plasticity; Strain; Tools; Element type; Limit strains; Mesh density; Numerical investigations; Plane strain tension; Sheet forming; Strain localization; Bending

Domaines: Génie des procédés; Matériaux; Mécanique [physics.med-ph]; Génie mécanique [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique des solides [physics.class-ph]; Mécanique des structures [physics.class-ph]

Tudor Balan, Farid Abed-Meraim. Numerical Investigation of the Limit Strains in Sheet Forming Involving Bending. 9th International Conference on Technology of Plasticity, ICTP 2008, Sep 2008, Gyeongju, South Korea. pp.690-695. ⟨hal-01213664⟩