先进复合材料格栅加筋板的总体稳定性分析

Global buckling load analysis of grid stiffened composite panels

通过建立复合材料格栅结构单元的基本力学假设和分析模型,推导了一种新的等效刚度计算方法,用于分析复合材料格栅加筋板的总体稳定性。该方法充分考虑了筋条和面板的相互作用和中面偏移效应,并具有通用性。结合Rayleigh-Ritz能量近似法,推导出了求解加筋板总体屈曲载荷的通用特征方程;分析了多种算例,并与修正平铺法进行了比较,结果吻合得很好。

Based on the proposed mechanical hypothesis and the analytical model of the grid stiffened composite panels, a new smeared stiffened theory was derived for analysing the global stability of grid-stiffened panels. The theory fully considered the effects of shell-stiffener interaction and influence of mid-plane shift. In this theory, the method is applicable for different types of grid stiffened elements. A general eigen function was deduced for computing global buckling load combined with a Rayleigh-Ritz method. The testing sample results were compared with those from the existing smeared stiffener theory, and they exhibited in good agreement. This proves the effectiveness of the proposed method.