复合材料帽型加筋壁板的失效机制分析与改进设计

为了准确预测复合材料帽型加筋壁板的后屈曲承载能力,针对压缩载荷下筋条端头斜削的复合材料帽型加筋壁板结构的失效机制及失效载荷进行了研究。首先利用物理试验,研究了端头斜削的复合材料帽型加筋壁板失效过程,然后构建了考虑蒙皮/缘条胶接界面以及复合材料层板失效的非线性损伤分析模型,详细地研究了损伤起始、扩展和失效的全过程。在此基础上,提出了包覆层对蒙皮/缘条界面进行增强的设计方案,并基于数值仿真和试验研究了包覆层对复合材料帽型壁板的破坏模式和承载能力的影响。数值分析和试验结果表明,包覆层设计能够明显提高结构的屈曲载荷和后屈曲承载能力,分析结果与试验值吻合良好,且预测的破坏模式也与试验结果一致。

Failure mechanism analysis and design of omega stiffened composite panel

In order to predict the post-buckling loading capability of omega stiffened composite panel accurately, the failure mechanism and failure load of omega stiffened composite panel with tapered stringers under compressive load were investigated.Firstly,the failure process of stiffened panel with tapered stringers was explored based on specimen experiment,and a nonlinear progressive damage model with the failure of adhesive interface and composite laminate was established to study the damage initiation and failure process in detail.Then,the method for the skin/flange interface enhanced by cladding layer was proposed,and the influence of the cladding layer on the failure mode and carrying capability has been explored by numerical simulation and test.The results show that the buckling load and post-buckling loading of the panel reinforced by cladding layer increase significantly.Moreover,the FE results for loading capability and the failure mode coincide with the test results.