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分析了筋条内弯型整体壁板压弯成形过程中蒙皮和筋条的弹塑性变形分布,鉴于内弯筋条发生塑性变形而蒙皮主要为弹性变形的特点,提出了一种将蒙皮部分简化为虚拟材料筋条的几何等效方法.推导了基于惯性矩的虚拟材料等效系数计算公式,给出了复杂网格筋条壁板等效模型建立过程和虚拟材料系数计算方法.进行了Ⅰ型单筋条和网格筋条壁板的有限元分析和压弯实验,对比分析了完整模型和等效模型的计算效率和精度,并用实验数据进行了验证,表明建立的压弯成形有限元等效模型精度可靠、效率数倍提高,为大型整体壁板压弯成形分析和工艺参数优化提供了基础.
The elastic-plastic deformation distribution of the skin and ribs during the bending process of curved wall panels was analyzed. In view of the plastic deformation of the internal bending bars, the skin was mainly elastic deformation, The paper deduces the calculation formula of equivalent coefficient of virtual material based on moment of inertia, and presents the calculation process of the equivalent model of complex grid rib slab and the calculation method of virtual material coefficient. The finite element analysis and buckling test of type Ⅰ single rib and grid rib slab were carried out. The computational efficiency and accuracy of the complete model and the equivalent model were compared and analyzed. The experimental data were used to verify that the established buckling The finite element equivalent model of forming is reliable and the efficiency is improved several times, which provides the foundation for the analysis of the large-scale bending deformation of the whole wallboard and the optimization of the process parameters.