In this work, the elastoplastic behavior of Zn20 alloy sheets is characterized via a methodology that encompasses experiments, modeling, and numerical simulations. The experimental campaign includes tensile, compression, shear, and bulge tests. The modeling is based on the Cazacu-Plunket-Barlat 2006 yield criterion and the Swift hardening law, adjusted only from experimental data from the tensile and compression tests. The corresponding material parameters are obtained with a calibration procedure that accounts for the tensile stress-strain curves and Lankford coefficients, along with five directions regarding the sheet's rolling direction. Besides, compression tests were performed to search for evidence of asymmetric behavior. The numerical simulation, carried out with the finite element method (FEM), is used to validate the previous characterization with the shear and bulge tests models. The experimental force-displacement curve and the shear strain contours are the comparison basis for the shear test. For the bulge test, considering different mask geometries (minor to major axis length ratios), plots of the major-minor strain paths and thickness reduction in terms of the dome height are also used to assess the model's predictive capabilities. In general, the obtained numerical results show a good description of the material behavior in the shear and bulge tests. The evolution of the strain field in the bulge test is well represented by the model regardless of the sample orientation and mask configuration. It is finally concluded that the proposed methodology provides a robust model to describe the elastoplastic response of Zn-Cu-Ti (Zn20) alloy sheets subject to different proportional loading conditions.

在这项工作中，Zn20 合金板的弹塑性行为通过包括实验、建模和数值模拟的方法进行表征。实验活动包括拉伸、压缩、剪切和膨胀测试。建模基于 Cazacu-Plunket-Barlat 2006 屈服准则和 Swift 硬化定律，仅根据拉伸和压缩试验的实验数据进行调整。相应的材料参数是通过校准程序获得的，该程序考虑了拉伸应力-应变曲线和 Lankford 系数，以及有关板材轧制方向的五个方向。此外，还进行了压缩测试以寻找不对称行为的证据。使用有限元方法 (FEM) 进行的数值模拟，用于通过剪切和膨胀测试模型验证先前的表征。实验力-位移曲线和剪切应变等值线是剪切试验的比较依据。对于膨胀测试，考虑到不同的掩膜几何形状（短轴与长轴长度比），主要-次要应变路径图和圆顶高度方面的厚度减少也用于评估模型的预测能力。总的来说，获得的数值结果很好地描述了剪切和膨胀试验中的材料行为。无论样品方向和掩模配置如何，模型都很好地代表了膨胀测试中应变场的演变。