Failure simulation of 7075-T6 Al alloy is very important due to its relatively low ductility compared to conventional steel. A hybrid numerical-experimental method was developed to determine plastic strains at fracture as a function of triaxiality. The uniaxial tension tests were performed by using the specimens including pure shear, 45° shear, smooth, R5 notch and R15 notch. The fracture locus was established by calibrating the parameters of the Hosford-Coulomb fracture model and was implemented into the GISSMO damage model. The results showed that the predicted force-displacement data were in good agreement with the experimental results. The results of the mesh dependence showed that the mesh size in the range of 0.5–5 mm did not have much influence on the damage results. To assess the accuracy of the damage model, three-point bending tests of the anti-collision beam were performed. The calibrated GISSMO damage model could accurately predict the load-displacement data.

与传统钢相比，7075-T6铝合金的失效模拟非常重要，因为其延展性相对较低。开发了一种混合数值实验方法来确定断裂时的塑性应变与三轴性的关系。通过使用包括纯剪切，45°剪切，光滑，R5缺口和R15缺口的试样进行单轴拉伸试验。通过校准Hosford-Coulomb骨折模型的参数来建立骨折部位，并将其实施到GISSMO损伤模型中。结果表明，预测的力-位移数据与实验结果吻合良好。网格依赖性的结果表明，网格尺寸在0.5-5 mm范围内对损伤结果没有太大影响。为了评估损坏模型的准确性，进行了防撞梁的三点弯曲测试。校准后的GISSMO损伤模型可以准确预测载荷-位移数据。