This study is aimed to predict ductile fracture of sheet metal forming for 6016-T4 aluminum alloy (AA6016-T4). Six shapes of tension tests in three directions with respect to the rolling direction have been carried out up to fracture to measure ductile fracture for the sheet. Since the fracture-related parameters determined by finite element simulation are sensitive to plasticity model, the Yld2000-2d and anisotropic Drucker yield functions with a combined Swift-Voce hardening model were firstly identified for AA6016-T4 and then used to compare the prediction accuracy. These constitutive models are implemented into ABAQUS for plane stress condition and S4R shell elements are set for the finite element model. Comparison of the experimental and simulation results indicates that the anisotropic Drucker yield function is more suitable for AA6016-T4 by considering both the computational accuracy and efficiency. Based on these results, fracture loci for AA6016-T4 were represented by four common ductile fracture criteria (Cockcroft–Latham, Rice–Tracey, Clift and DF2012). Three kinds of specimen were employed to calibrate the fracture models by using a hybrid experimental–numerical method. The results show that the DF2012 criterion is more flexible and accurate for AA6016-T4 with the comparison of force–displacement curves. For further validation, these four ductile fracture criteria are also applied to predict the fracture of an automobile inner panel in drawing forming, and the results show that the DF2012 criterion provides sufficient prediction precision for AA6016-T4.

这项研究旨在预测6016-T4铝合金（AA6016-T4）的钣金成形延性断裂。已经在相对于轧制方向的三个方向上进行了六种形状的拉伸试验，直至断裂，以测量片材的延性断裂。由于通过有限元模拟确定的与断裂相关的参数对塑性模型敏感，因此首先针对AA6016-T4识别了Yld2000-2d和各向异性的Drucker屈服函数，并结合了Swift-Voce硬化模型，然后将其用于比较预测精度。这些本构模型在平面应力条件下被实现到ABAQUS中，而S4R壳单元被设置为有限元模型。实验和仿真结果的比较表明，考虑到计算精度和效率，各向异性的Drucker屈服函数更适合AA6016-T4。根据这些结果，AA6016-T4的断裂位点由四个常见的韧性断裂标准（Cockcroft–Latham，Rice–Tracey，Clift和DF2012）代表。通过使用混合实验-数值方法，使用三种标本来校准断裂模型。结果表明，通过比较力-位移曲线，DF2012标准对于AA6016-T4更加灵活和准确。为了进一步验证，这四个延性断裂标准也用于预测汽车内板在拉深成形中的断裂，