Numerical Study on Asymmetrical Rolled Aluminum Alloy Sheets Using the Visco-Plastic Self-Consistent (VPSC) Method

Abstract

Asymmetric rolling is a forming process that has raised interest among researchers due to the significant improvements it introduces to the mechanical response of metals. The main objective of the present work is to perform a numerical study on asymmetrical rolled aluminum alloy sheets to identify and correlate the effect of the additional shear strain component on the material formability, tensile strength, and texture orientations development during multi-pass metal forming. Conventional (CR), asymmetric continuous (ASR-C), and asymmetric rolling-reverse (ASR-R) simulations were carried out using the visco-plastic self-consistent (VPSC) code. For the ASR process, two different shear strain values were prescribed. Moreover, two hardening models were considered: a Voce-type law and a dislocation-based model that accounts for strain path changes during metal forming. Results showed that the ASR process is able to improve the plastic strain ratio and tensile strength. The ASR-C revealed better results, although the expected shear orientations are only evident in the ASR-R process.

Plastic Behavior and Microstructure Heterogeneity of an AA6063-T6 Aluminum Alloy Processed by Symmetric and Asymmetric Rolling

“…Thus, Figure 8a indicates that the AR sheet texture is dominated by Cube and Goss texture components, as corroborated by the ODF and the ideal orientation representation in Figure 8d. These components have been associated with the recrystallization phenomena in Al alloys processed by rolling [24,39]. On the other hand, when the sheet was rolled symmetrically and asymmetrically, a similar overall behavior was observed, as shown in Figure 8b,c.…”

“…For that reason, this model has earned the attention of many researchers around the globe. For example, Graça et al [24] studied the shear effect of the ASR process employing the VPSC model in an Al alloy. The authors demonstrated that ASR improved the mechanical properties and the plastic strain ratio.…”

The Effect of Rolling Texture on the Plastic Deformation of Nano-Gradient Aluminum

“…This modeling approach considers each constituent grain as an inclusion embedded within a homogeneous viscoplastic medium [36]. The VPSC is able to capture the mechanical behavior and texture evolution of FCC crystals [37][38][39]. The detailed continuum mechanics and the homogenization method of the VPSC can be referred to in Appendix A.…”