Today, sheet metal process simulations based finite element (FE) analysis became an indispensable part of tool design engineering in automotive and related stamping industries. In this context, an analytical description of the inherent directional strength and deformation variations in these sheet metals are conducted by means of an orthotropic yield criterion. In practice, an appropriate criterion can be determined using directionality parameters such as r-values and yield stress ratios from simple tension tests to predict material strength and deformation anisotropies analytically. When yield criteria together with the computed anisotropy parameters are implemented into the finite element software, however, it should be also investigated whether the finite element (FE) model could capture the actual anisotropic behavior of the material and assess the analytical model accurately. One way of ensuring this condition is to use single finite element tests in order to simulate uniaxial deformation behavior of material in simple tensile tests. In this study, FE analyses of simple tension test with sheet specimens were conducted for specimens from seven evenly spaced directions for two widely used sheets in the automotive industry, namely DP600 and AA2090-T3 aluminum alloy. Lankford parameters and the yield stress ratios were predicted with analytical approach and FE analysis for different material orientations. It is determined that, while plasticity model analyses are quite successful in terms of computed deformations and flow curves, Barlat’s yield functions family has significant strength and deformation differences between analytical and numerical results, especially for steel sheets. It is assessed that these discrepancies are caused by plasticity implementation into FE software.

如今，基于有限元 (FE) 分析的钣金工艺模拟已成为汽车和相关冲压行业工具设计工程中不可或缺的一部分。在这种情况下，通过正交各向异性屈服准则对这些金属板的固有方向强度和变形变化进行了分析描述。在实践中，可以使用方向性参数（例如来自简单拉伸试验的 r 值和屈服应力比）确定适当的标准，以分析预测材料强度和变形各向异性。然而，当屈服准则与计算出的各向异性参数一起实施到有限元软件中时，还应研究有限元 (FE) 模型是否能够捕捉材料的实际各向异性行为并准确评估分析模型。确保这种条件的一种方法是使用单个有限元测试来模拟材料在简单拉伸测试中的单轴变形行为。在这项研究中，对汽车工业中两种广泛使用的板材，即 DP600 和 AA2090-T3 铝合金的七个均匀间隔方向的样品进行了板材样品简单拉伸试验的有限元分析。Lankford 参数和屈服应力比通过分析方法和不同材料取向的有限元分析进行预测。确定的是，虽然塑性模型分析在计算变形和流动曲线方面非常成功，Barlat 的屈服函数族在解析结果和数值结果之间存在显着的强度和变形差异，尤其是对于钢板。据评估，这些差异是由 FE 软件的可塑性实现引起的。