短柱型复合材料加筋壁板轴向压缩破坏分析方法研究

复合材料加筋结构可作为航空结构中的承力部件，其损伤与破坏对航空器的结构安全和服役性能至关重要．本文通过试验和数值仿真手段研究了短柱型复合材料结构压缩失效机理和极限承载力．通过短柱型单加筋板的轴向压缩破坏试验，分析梳理出界面脱粘和材料压溃两种典型失效形式；分别建立加筋板壳单元模型和实体单元模型，引入内聚力模型和Hashin 准则描述界面脱粘效应与材料破坏，结果表明壳单元模型配合内聚力模型和Hashin 准则可以有效地预测加筋板的极限承载力．分别讨论了加筋板长度、筋条高度、筋条/蒙皮刚度比等参数对加筋板的屈曲承载力的影响，为短柱型复合材料加筋壁板压缩损伤与破坏预测分析提供有益的参考．

Failure Analysis of Short-Column Composite Stiffened Panel under Compressive Load

Composite stiffened structure can be used as important load-bearing components in aircrafts. Its damage and destruction are very important for aircraft’s structural security and service performance. In this paper, the compression failure mechanism and ultimate bearing capacity of short column composite structure are studied by means of experiment and numerical simulation. Firstly, six groups of single stiffened short column panels are tested under axial compression. The test results show that there are two typical failure modes: interface debonding and material collapse. Then, two finite element models for the stiffened panel are established with the shell elements and solid elements, respectively. The interfacial damage and material failure are described by cohesive zone model and Hashin criterion, respectively. Simulation results show that the shell element-based model combined with cohesive zone model and Hashin criterion can predict the ultimate bearing capacity of the stiffened panel effectively. The influences of the length, the height of the reinforced plate and the stiffener-to-skin stiffness ratio on the buckling resistance capacity of stiffened panels are discussed respectively, which provides a useful reference for the analysis and prediction of the compression damage and failure of stiffened panels of short column composite materials.