复合材料加筋屈曲数值分析研究

摘要

The pape studies computationally the nonlinear buckling features and linear buckling character-istics of aircraft stiffened structure of panel under the compression, based on finite element analysis by ABAQUS,the method of analyzing buckling and post buckling is given,and making some research on dif-ferent conditions.The influence of different element types for eigenvalue buckling analysis is considered. The influences of different element types,different boundary conditions for critical buckling load and load carrying capacity of composite stiffener under nonlinear post buckling analysis is considered.Element type has little effect on linear buckling load,but it have a great influence on the nonlinear post buckling load. So,it is necessary to select the reasonable element in the nonlinear post buckling analysis.%应用有限元分析技术，采用ABAQUS有限元计算软件研究了加筋在受压状态下的线性屈曲和非线性后屈曲行为，给出了分析屈曲以及后屈曲的方法，并且做了一些不同条件的研究。考虑了不同单元类型对特征值屈曲分析临界载荷的影响，并比较了不同单元、不同边界条件在非线性后屈曲分析下加筋的临界屈曲载荷与承载能力。单元类型对线性屈曲几乎没有影响，而对非线性后屈曲分析结果影响很大，在进行后屈曲分析时有必要选择合理的单元。