采用成形极限图准则和韧性断裂准则两个数值准则对6061铝合金的成形特征进行预测。将数值模拟结果与实验所得成形极限图和冲头力−位移图进行对比。采用Hecker半圆形冲头计算实验成形极限图。将实验成形极限图转化为成形极限应力图并导入 Abaqus 软件中对样品的缩颈进行预测。将成形极限应力图预测结果与实验所得成形极限应力图进行比较。结果表明，韧性断裂准则对6061铝合金成形极限图和成形极限应力图的预测精度较高。冲头的力−位移图模拟结果和实验结果对比表明模拟结果和实验结果吻合。%Two numerical criteria of forming limit diagram (FLD) criterion and ductile fracture criterion (DFC) are presented for FLD prediction of 6061 aluminum. The numerical results are compared with the experimental FLD and also punch’s load−displacement curve of experimental samples. Experimental FLD of this study is calculated using hemispherical punch test of Hecker. Experimental FLD is converted to FLSD and imported to the Abaqus software to predict necking of samples. Numerical results for FLSD prediction were compared with experimental FLSD. Results show that ductile fracture criterion has higher accuracy for FLD and FLSD prediction of 6061 aluminum. Comparison of numerical and experimental results for force−displacement curve of punch shows that numerical results have a good agreement with experiment.
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