透镜式薄壁CFRP管空间伸展臂轴压屈曲分析及试验

对透镜式截面四层铺设薄壁碳纤维增强塑料(CFRP)管空间伸展臂进行轴压载荷试验,得到轴压临界屈曲载荷及屈曲特性。利用有限元模型进行线性特征值屈曲分析,并引入屈曲模态形式作为初始几何缺陷进行非线性屈曲分析,得到轴压下屈曲临界载荷及非线性屈曲特性,并与试验结果进行对比分析。结果表明初始几何缺陷对CFRP管轴压临界载荷影响较大,给CFRP管加入适当的几何缺陷可更有效模拟实际非完善体的屈曲载荷。进而对其材料厚度、层数和铺设角度进行参数分析,得到各参数对轴压临界载荷的影响程度及敏感性,本文对透镜式薄壁CFRP管空间伸展臂的设计和深入研究具有重要参考价值。

Buckling Analysis and Experiment of Lenticular CFRP Thin-Walled Tube Space Boom under Axial Compression

The axial compression experiment of Lenticular CFRP Tube Space Boom having four-ply layup is performed,and the external buckling load and the stability are obtained.Linear buckling load is obtained by using the finite element method,taking the linear buckling mode as initial geometrical defect of the tube,the non-linear analysis under is made axial compression and the non-linear buckling load is found subsequently,then the results are compared with testing results.The outcome shows that initial defects limitations affect buckling load of CFRP tube greatly,adding proper defects to CFRP tube can make the finite element model simulate geometrical imperfection of CFRP tube well and expect buckling load of actual tube better.The material characteristics such as thickness,number of layers and layout angle are investigated and the buckling load is obtained for each case subsequently,influence and sensitivity of parameters were compared.In this paper,the numerical procedure and experimental results are valuable to the optimization design of Lenticular CFRP thin-walled Tube Space Boom.