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运用商用有限元程序建立三维的壳模型模拟板料的成型过程。分别分析和比较了不同厚度及不同相对弯曲半径的板料在多次成型后,其截面上各节点的轴向残余应力分布情况;成型后的模型弯曲段部分点沿径向的轴向残余应力分布;并且通过对各个模型的比较分析得出,厚度以及相对弯曲半径分别对冷弯残余应力的影响。随着厚度和相对半径的增大,截面上沿径向的最大轴向拉压应力,都是依次减小的。进而为材料的稳定性分析提供参考,尽可能地为材料的产业化生产提供工艺优化的理论依据。
Using commercial finite element program to establish a three-dimensional shell model to simulate the sheet metal forming process. The axial residual stress distribution of each node in the cross section of the sheet with different thicknesses and different relative bending radii is analyzed and compared respectively. The axial residual stress Distribution; and through the comparative analysis of the various models, the thickness and the relative bending radius, respectively, on the impact of cold bending residual stress. With the increase of the thickness and the relative radius, the maximum axial tensile stress in the radial direction of the section decreases in turn. And then provides a reference for the stability analysis of the material, as far as possible for the industrial production of materials to provide the theoretical basis for process optimization.