采用参数优化后的Hill'48 屈服准则对镁合金V型辊弯成形回弹进行数值模拟研究及实验验证

Numerical Simulation and Experimental Verification of Springback in Magnesium Alloy V-shaped Roll-Bending Using Optimized Hill'48 Yield Criterion

摘要:

镁合金由于其各向异性特征，在数值模拟计算中难以准确预测镁合金板材弯曲回弹过程。为了更准确地分析镁合金V型辊弯成形回弹，利用Matlab应用误差优化函数优化ABAQUS仿真软件中Hill’48屈服准则所需的各向异性势值参数。采用优化后的Hill’48屈服准则模型对镁合金V型辊弯成形回弹进行数值模拟研究，将其结果与实验结果进行对比。结果表明，采用优化后的Hill’48屈服准则后回弹变化率与辊弯成形实验成型件的回弹变化率误差在2%以内。采用各向异性势值优化后的Hill’48屈服准则可以提高镁合金V型辊弯成形的回弹预测精度。

Abstract:

The bending springback of magnesium alloys is difficult to predict accurately by numerical simulations because of their anisotropic characteristics. The springback of magnesium alloy V-shaped roll-bending was analyzed using the error optimization function in Matlab to optimize the anisotropic potential values required for the Hill'48 yield criterion in ABAQUS. The optimized Hill'48 yield criterion model was used to numerically simulate the springback of magnesium alloy V-shaped roll-bending. The simulation results were compared with the experimental results. Results show that the error between the springback change ratio obtained using the optimized Hill'48 yield criterion and experimentally formed parts is within 2%. Overall, the optimized Hill'48 yield criterion improves the prediction accuracy of springback in magnesium alloy V-shaped roll-bending.