Abstract In this study, a novel method was proposed to evaluate high strain rate (HSR) formability of Al-Cu-Mg 2B06-O sheets by impact hydroforming (IHF). IHF was suitable to manufacture hard-to-form sheets, since it combined the advantages of flexible liquid and impact impulse loading. Both 2D and 3D HSR formability curves were established to describe the relationship between impact energy, drawing height ratio (DHR) and deep drawing ratio (DDR). Moreover, the novel evaluation method was realized by finite element (FE) modeling using fluid-structure interaction (FSI) algorithm. FSI modeling was used to deal with the interaction of structure solid and flexible fluid. This evaluation means of FE modeling characterized with guiding production practice, saving evaluation costs, improving efficiency compared with corresponding experiments. The results obtained from FE modeling were in a remarkable agreement with those obtained from IHF experiments in the aspects of part shape, failure feature, thickness distribution. FE modeling showed that the limit deep drawing ratio (LDDR) and limit drawing height ratio (LDHR) were 1.99 and 1.04, respectively when the blank was completely deep drawn into the cavity of the die in one step only. FE modelling is proved to be reliable and efficient to estimate high strain rate formability of low formability metal sheets.

中文翻译：

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一种评价金属板材冲击液压成形高应变率成形性的新方法

摘要 在这项研究中，提出了一种通过冲击液压成形 (IHF) 评估 Al-Cu-Mg 2B06-O 板的高应变率 (HSR) 成形性的新方法。IHF 适用于制造难以成型的板材，因为它结合了柔性液体和冲击脉冲载荷的优点。建立了 2D 和 3D HSR 成形性曲线来描述冲击能量、拉伸高度比 (DHR) 和深拉伸比 (DDR) 之间的关系。此外，新的评估方法是通过使用流固耦合 (FSI) 算法的有限元 (FE) 建模来实现的。FSI建模用于处理结构固体和柔性流体的相互作用。这种有限元建模评价手段与相应的实验相比，具有指导生产实践、节约评价成本、提高效率的特点。有限元建模获得的结果与 IHF 实验获得的结果在零件形状、失效特征、厚度分布等方面非常一致。有限元建模表明，当坯料仅一步深拉入模具型腔时，极限深冲比 (LDDR) 和极限拉伸高度比 (LDHR) 分别为 1.99 和 1.04。有限元建模被证明是可靠且有效的，用于估计低成形性金属板的高应变率成形性。分别是当坯料仅一步完全拉入模具型腔时。有限元建模被证明是可靠且有效的，用于估计低成形性金属板的高应变率成形性。分别是当坯料仅一步完全拉入模具型腔时。有限元建模被证明是可靠且有效的，用于估计低成形性金属板的高应变率成形性。