在板料的中性层上，用放射投影法对复杂钣金固定梁的形状进行展开尺寸研究。

The unfold blank of the complex shape is researched by the method of emit-projection based on sheet neutrosphere .

半刚性基层的正应力沿截面高度呈线性分布，合成大梁试件的中性层低于其几何形心。

The results also show the strain is linear distributing along the section height of semi-rigid base, and the neutral layer of the beam specimen is lower than its geometrical center.

通过对带钢横截面上应力状态的分析，研究了纵向拉力对带钢变形的影响，给出了计算带钢中性层应变的方法。

The influence of axial force on the elastic-plastic stretch bending and sprngbackof a sheet metal is examined and a method to calculate the strain of middle layer is also given.