Prediction and characterization of forming limits at necking from shear to equi-biaxial loading using the biaxial tensile testing method: Feasibility study and application to AA6061-T4 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Mechanics of Materials Année : 2023

Prediction and characterization of forming limits at necking from shear to equi-biaxial loading using the biaxial tensile testing method: Feasibility study and application to AA6061-T4

Résumé

Determination of forming limit curve (FLC) over a wide range of strain paths can provide a more thorough understanding of sheet metal formability. In this work, for the first time, in-plane biaxial tensile tests employing two distinct cruciform specimens are performed to construct the FLC of AA6061-T4 sheets from shear to equi-biaxial stretching. Four different necking detection methods are investigated in a FE (finite element) procedure to find proper ones for the defined specimens. This procedure consists of the FE modeling of the biaxial tensile test and the Marciniak test. An anisotropic Gurson-Tvergaard-Needleman (GTN) plasticity model based on Hill'48 yield function is calibrated and implemented in simulations to reproduce the anisotropic plasticity and failure behavior of AA6061-T4 sheets. Then, the selected necking detection methods are applied to the biaxial tensile test to experimentally identify the limit strains at necking. The results show that considering two distinct cruciform specimens is an effective solution for the biaxial tensile test to determine the FLC covering a wider range of strain paths. The predicted FLCs show good agreement with the experiments, indicating that the numerical biaxial tensile test combined with the anisotropic GTN plasticity model is an efficient tool for predicting sheet metal formability. © 2023 Elsevier Ltd

Dates et versions

hal-04019379 , version 1 (08-03-2023)

Identifiants

Citer

Z. Wang, D. Guines, X. Chu, L. Leotoing. Prediction and characterization of forming limits at necking from shear to equi-biaxial loading using the biaxial tensile testing method: Feasibility study and application to AA6061-T4. Mechanics of Materials, 2023, 179, pp.104598. ⟨10.1016/j.mechmat.2023.104598⟩. ⟨hal-04019379⟩
14 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More