整体壁板压弯成形等效计算模型

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.

Press bending equivalent simulation model of integrally reinforced panel

The elastic and plastic deformation distribution of skin and stiffener were analyzed during press bending for integrally reinforced panel with inside ribs. According to the characteristics of plastic deformation on inside stiffener and mainly elastic deformation on skin, a geometrical equivalent method was proposed which simplified the skin component to stiffener with virtual material properties. The calculative formula of equivalent coefficient was educed based on inertia moment. For complicated integrally reinforced panel, the establishment process and calculative method of equivalent model were also introduced. The finite element analysis and experiment of Ⅰ -style single stiffener and gridding stiffener panels were carried out. The comparisons on efficient and precision between detailed model and equivalent model were made and verified by experimental data. The equivalent model for press bending was proved to be reliable and highly efficient which can be used for simulation and parameter optimization of large complicated gridding integrally reinforced panel.