Aluminium sheet parts manufactured by cold-forming processes are subjected to ductile damage due to the plastic deformation. Tool design based on the experience and failure prediction using simple criteria in sheet metal forming can cause high cost of material scrap and tools modifications. Consequently, the ability to predict ductile damage gives full control of the forming process. This work was conducted to evaluate the predictive capability of different damage models for AA 5754 under cold forming condition. The models are calibrated using published tensile and forming limit diagram data for AA 5754. A set of experimental cup tests for AA 5754 sheet were conducted to validate the selected models. An FE model was developed to simulate the cup test process using LS-DYNA software. The selected models used were the Johnson-Cook, continuum damage model (CDM), Gurson model and the generalized incremental stress state-dependent model (GISSMO) model. The experimental results of the cup tests were compared with the simulation results from different damage models concluding that the Gissmo model was able to show a good agreement with the experimental results.

通过冷成型工艺制造的铝板零件由于塑性变形而遭受延性损坏。根据经验和故障预测使用薄板成形中的简单标准进行工具设计会导致材料报废和工具修改的高昂成本。因此，预测延性破坏的能力可以完全控制成形过程。进行这项工作是为了评估冷成型条件下AA 5754的不同损伤模型的预测能力。使用公布的AA 5754拉伸和成形极限图数据对模型进行校准。对AA 5754板材进行了一组实验杯试验，以验证所选模型。开发了FE模型，以使用LS-DYNA软件模拟杯子测试过程。选择的型号为Johnson-Cook，连续损伤模型（CDM），Gurson模型和广义增量应力状态相关模型（GISSMO）模型。将杯试验的实验结果与不同损伤模型的模拟结果进行了比较，得出结论，吉斯莫模型能够与实验结果很好地吻合。