The computation expression for the strain neutral layer of stress and plastic bending was introduced and so the thinning coefficient computing formula of sheet metal was deduced.

给出了板料弯曲的应力应变中性层和纯弯曲应变中性层的计算公式，并推出板料弯曲时的变薄系数计算公式。

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With the total strain theory and membrane assumption and taking the normal anisotropy of sheet metal into consideration, initial blank size can be directly calculated from desired flanging height.

在该算法中，采用了全量塑性理论及膜应变假定，并考虑了板材的厚向各向异性，可以直接从所需的翻边高度计算出初始坯料的尺寸。

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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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