复合材料T型加筋壁板后屈曲承载能力研究

Research on the post-buckling bearing capacity of T-type composite stiffened panel

为了研究飞机复合材料T型加筋壁板结构在轴压载荷下的承载能力,对复合材料T型加筋壁板进行了轴压试验,并使用工程算法和有限元法仿真进行了分析,得到了加筋板的屈曲载荷及破坏载荷、载荷-位移曲线及损伤演化过程。对比两种分析方法与试验结果可以得到:当复合材料加筋壁板屈曲后,还有较强的后屈曲承载能力;相对于有限元分析方法,工程算法误差更大;准静态法可以有效地模拟出加筋板的屈曲及后屈曲行为,但是计算代价相对较大。

In order to study the post-buckling bearing capacity of T-type composite stiffened panel under compression load,calculation of engineering algorithm,finite element method and compression test are used for composite stiffened panel.The buckling load and failure load,load-displacement curve and damage evolution of composite stiffened panel are obtained.By comparing the two methods and test results,some conclusions can be obtained.There is a strong post-buckling bearing capacity after buckling.Compared with the finite element method,the error of engineering algorithm is larger.The quasi-static method can effectively simulate the buckling and post-buckling behavior of stiffened panel,but the calculation cost is relatively large.