工字型加筋复合材料壁板的压缩屈曲行为实验研究

Experimental study on compression buckling behavior of I-shaped rib stiffened composite panel

在复合材料结构整个屈曲承载过程中，从微观开始发生局部的纤维断裂、基体微裂纹等损伤，并随着屈曲程度的增加和屈曲模式的转化逐渐发生分层扩展。采用实验与数值计算相结合的方法，本文研究了工字型加筋壁板复合材料结构在压缩载荷作用下的屈曲行为。采用无损光学手段来非接触检测壁板表面的全场屈曲挠度，捕捉屈曲模态演化过程。基于有限元的数值模拟，预测了工字型加筋壁板复合材料结构的屈曲与后屈曲行为，用定量的实验数据来对比数值预测的壁板屈曲形态，表明实验和数值结果的离面挠度分布具有一致性。

During the overall buckling loading process of composite structure, the local damage, such as fiber breakage and matrix microcrack occur at microscale, and then delamination and propagation occur with the increase of buckling degree and the transformation of buckling mode. In this paper, the buckling behavior of I-shaped rib stiffened panel composite structure under compression load is studied by combining experiments with numerical calculation. Non-destructive optical method was used to detect the full-field buckling deflection of the panel surface, and to capture the evolution process of buckling mode. Based on the numerical simulation of finite element method, the buckling and post- buckling behaviors of I-shaped rib stiffened panel composite structures are predicted. It is shown that the off-plane deflection distribution of the experimental and numerical results is consistent.