Maximal crack displacement increases with the increase of strain rate sensitivity, and is independent on punch velocity and viscosity.

最大破裂位移仅随应变速率敏感系数的增大而增大，而与压头速度和粘度的大小无关。

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The effect of punch virtual velocity and sheet virtual density on the sheet strain energy was studied in this paper.

从理论上分析了凸模虚拟速度和板料虚拟密度对薄板变形能的影响。

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For the simulation accuracy of springback problem in sheet metal forming, the effect of punch virtual velocity and sheet virtual density on the sheet strain energy was studied in this paper.

针对板料成形回弹精度问题的数值模拟，从理论上分析了凸模虚拟速度和板料虚拟密度对薄板变形能的影响。

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