Analysis of the Anisotropic Behavior and of the Formability Aptitude for an AA2024 Alloy Using the Channel Die Compression Test and the Simple Tension Test

Abstract

The mechanical behavior of metallic materials during sheet forming processes must be related to their anisotropic properties and their formability aptitude. So, in this paper, channel die compression experiments are proposed to analyze the anisotropy of an AA2024 thick sheet. A modified quadratic Hill criterion based on the variation of the coefficients with the cumulated plastic strain is proposed. To compare and to validate the identified Hill coefficients values, classical tensile tests are also analyzed. The results are validated via finite element simulations of the tensile tests and channel die compression experiments using the commercial code LS-DYNA.

Applications of Multi-Scale Models to Numerical Simulation and Experimental Analysis of Anisotropic Elastoplastic Behavior of Metallic Sheets

“…In the case of time independent plasticity, the plastic multiplier λ is given by the consistency condition 0 = f . The Hill's 1948-yield criterion [5,6] is commonly used to study the plastic anisotropic properties of sheet metals. Starting from Eq.…”

Experimental characterization and numerical modeling of the three-dimensional anisotropic behavior of a thick sheet aluminum alloy AA2024-T351 using multi-scale approaches

“…There are many possibilities for extending the isotropic criteria to the description of anisotropic materials [3][4][5]. The method generally used to take into account a 3D anisotropy is to involve a tensor of fourth order into the criterion expression [5][6][7][8][9]. An anisotropic yield loci can be written as a quadratic extension of the von Mises formulation as can be seen in Table 2 which summarizes the general constitutive equations of a macroscopic unified model and of anisotropic Hill 1948 criteria.…”

“…This work presents an introduction of the study of the three-dimensional anisotropy of an aluminium alloy. So the paper starts with two specific cases of a 3D plastic anisotropy: plane and normal, analyzing three different elasto-plastic numerical approaches: a unified model, a multi-mechanism model and a polycrystalline one [3][4][5][6][7][8][9][10]. To demonstrate their feasibility and to identify the most accurate model describing the plastic anisotropy, a lot of comparisons are realized with the experimental data obtained from tensile tests performed for specimens with a thickness of 3 mm along different directions to the rolling direction.…”