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。
Traditional theory has not considered the influence of the neutral layer inside displacement on bending springback when analyzing the springback.
传统理论在分析回弹时，没有考虑应变中性层内移对回弹的影响。
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