Abstract
Unlike other HCP metals such as titanium and magnesium, the behavior of zinc alloys has only been modeled in the literature. For the low Zn-Cu-Ti alloy sheet studied in this work, the anisotropy is clearly seen on the stress-strain curves and Lankford coefficients. These features impose a rigorous characterization and an adequate selection of the constitutive model to obtain an accurate representation of the material behavior in metal forming simulations. To describe the elastoplastic behavior of the alloy, this paper focuses on the material characterization through the application of the advanced Cazacu-Plunket-Barlat 2006 (CPB-06 for short) yield function combined with the well-known Hollomon hardening law. To this end, a two-stage methodology is proposed. Firstly, the material characterization is performed via tensile test measurements on sheet samples cut along the rolling, diagonal and transverse directions in order to fit the parameters involved in the associate CPB-06/Hollomon constitutive model. Secondly, these material parameters are assessed and validated in the simulation of the bulge test using different dies. The results obtained with the CPB-06/Hollomon model show a good agreement with the experimental data reported in the literature. Therefore, it is concluded that this model represents a consistent approach to estimate the behavior of Zn-Cu-Ti sheets under different forming conditions.
Highlights
Zinc is commonly used as a corrosion-resistant coating
The obtained Hollomon and CPB-06 fitted coefficients are respectively presented in Tables 2 and
The obtained Hollomon and CPB-06 fitted coefficients are respectively presented in Tables 2 and 3
Summary
Zinc is commonly used as a corrosion-resistant coating It is produced as thin sheets, mainly used in architecture and construction as roofing material, rain gutters and decorative products. In addition to its corrosion resistance property, zinc shows high malleability, ductility and a high quality and durable surface finish. Despite these wide uses, there is a lack of studies and information with respect to zinc sheet formability, in which the high c/a ratio may lead to a marked and evolving anisotropy in the plane of the blank as a consequence of the texture modification [1,2,3,4].
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