基于数值模拟方法的U肋加劲板初始几何缺陷研究

Study on Initial Geometrical Defect on U-rib Stiffened Plate Based on Numerical Simulation

为较为准确地计入初始几何缺陷的形态和大小,通过塞尺试验得到的U肋加劲板初始几何缺陷的实测值,然后利用数值模拟方法对U肋加劲板初始几何缺陷形态与大小的简化等效模拟方法进行研究。研究表明:整体几何缺陷按正弦半波形式来进行简化处理是比较安全的,局部几何缺陷按模型特征值屈曲的第一阶屈曲模态简化处理是比较安全的,采用简化几何缺陷形式与实测几何缺陷的应力和变形曲线基本一致。

In order to arcurately acquire the shape and size of initial geometrical defect,we obtained the measured values of the initial geometrical defect on U-rib stiffened plate by feeler test. Based on the numerical simulation method,we studied the simplified equivalent simulation method of shape and size of initial geometrical defect on U-rib stiffened plate. The result shows that（ 1） the simplified simulation distribution form of global geometric defects using the way of sinusoidal half-wave is safe;（ 2） simplified simulation distribution form of local geometric defects using the way of the first-order bucking modal of eigenvalue bucking is safe;（ 3） for the simplified form of geometrical defect and measured form of geometrical defect,the curves of stress and deformation are basically consistent.