In this study, the numerical simulations of sheet metal forming processes are performed based on a fully coupled elastoplastic damage model. The effects of stress triaxiality and Lode angle are introduced into the damage evolution law to capture the loading-path-dependent failure. The proposed constitutive model is implemented into the finite element (FE) code ABAQUS/Explicit via the user-defined subroutine (VUMAT). Next, the identification procedure for DP780 based on the hybrid experimental–numerical method is presented in detail. The numerical results of simple tests are compared with the experiments, and obvious improvement is observed for the proposed model under various loading paths. Finally, the model is applied to predict the edge fracture during sheet blanking process. The predicted global load–displacement responses and crack paths have a good agreement with the experimental results, indicating that the model holds great potentials in simulation of metal forming processes.

在这项研究中，基于完全耦合的弹塑性损伤模型对钣金成形过程进行了数值模拟。将应力三轴性和Lode角的影响引入损伤演化定律，以捕获与加载路径有关的破坏。所提出的本构模型通过用户定义的子例程（VUMAT）实现为有限元（FE）代码ABAQUS / Explicit。接下来，详细介绍了基于混合实验-数值方法的DP780的识别程序。将简单测试的数值结果与实验进行了比较，并在各种载荷路径下对该模型进行了明显的改进。最后，该模型被应用于预测在冲裁板过程中的边缘断裂。