In this paper, an anisotropic formulation of the Gurson-Tvergaard-Needleman (GTN) damage model is used for simulating the deep-drawing of a rectangular box made from an AA6016-T4 metallic sheet. The model is implemented as a VUMAT routine in the ABAQ

建立1-4阶响应面代理模型，建立4阶响应面预测模型，对模型精度进行检验(Establishing the fourth order response surface proxy model)