Abstract The formability of electro-hydraulically formed AA5182-O aluminium sheet was investigated by means of experimental testing and numerical modelling. The experimental results were compared with quasi-static, as-received forming limit curve (FLC) and were used to calibrate a finite element model of EHF. It is found that the formability improvement of AA5182-O sheets was insignificant when electro-hydraulically formed without a die. However, when specimens were electro-hydraulically formed with sufficient energy into 34 or 40° conical dies, the effective strain measured in safe grids increased by 40 and 70% respectively when compared with a conservative quasi-static FLC. Finite element simulation results suggested that a combination of different mechanical parameters contributed to the formability improvement. The increased strain rate in areas close to the apex of the speimen, the negative stress triaxiality just before specimens contact the die, and significant compressive through-thickness stress generated by high-velocity impact all contributed to the improvement of formability in electro-hydraulic die forming.

中文翻译：

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AA5182-O薄板电液成形性能改进的实验与数值分析

摘要 通过实验测试和数值模拟研究了电液成型AA5182-O铝板的成形性。将实验结果与准静态、原样成形极限曲线 (FLC) 进行比较，并用于校准 EHF 的有限元模型。研究发现，AA5182-O 板材在没有模具的情况下进行电液成型时，其成型性能的改善并不显着。然而，当试样以足够的能量通过电动液压成型为 34 或 40° 锥形模具时，与保守的准静态 FLC 相比，在安全网格中测得的有效应变分别增加了 40% 和 70%。有限元模拟结果表明，不同机械参数的组合有助于提高成形性。