空间薄壁CFRP豆荚杆悬臂屈曲分析及试验

空间薄壁CFRP豆荚杆工作时处于悬臂状态,为掌握其悬臂受力性能,分别以截面2个对称轴为中性轴对豆荚杆悬臂梁进行末端加载试验,得到了屈曲荷载及屈曲特性.利用ABAQUS进行线性特征值屈曲分析,并引入特征值屈曲模态作为初始几何缺陷进行非线性屈曲模拟,得到豆荚杆悬臂梁屈曲临界载荷及非线性屈曲特性.与试验结果进行对比分析表明:初始几何缺陷对豆荚杆悬臂梁屈曲临界载荷影响显著,给理想豆荚杆植入适当的初始几何缺陷可有效模拟实际豆荚杆屈曲.基于试验和模拟分析,进一步对豆荚杆壁厚、铺层和杆件长细比进行参数分析,得到各参数对豆荚杆悬臂梁屈曲临界载荷的影响,对悬臂薄壁CFRP豆荚杆的设计和应用具有重要参考价值.

Buckling Analysis and Experiment of Cantilever Thin-Walled Lenticular CFRP Space Boom

Abstract： The thin walled lenticular CFRP (Carbon Fiber Reinforced Plastic)space boom operates as a cantilever. The two symmetry axils of cross section were taken as neutral axils respectively. The loading tests were performed and the load was applied at the cantilever tip. The external buckling load and the stability of the cantilever lenticular boom were obtained simultaneously. A linear eigenvalue buckling analysis was performed by using the ABAQUS, the linear buckling modes were seeded subsequently as an initial geometrical imperfection of the boom, and the non linear buckling analysis was conducted finally with load at the cantilever end. The results show that the initial geometrical imperfection has significant effects on buckling behavior while the proper geometrical imperfection seeded to the ideal perfect model can simulate the practical boom. A parametric analysis was done to evaluate the critical buckling load and buckling behavior, such as thickness, number of plies and slenderness. This paper can provide valuable reference for the optimization design of thin walled CFRP lenticular spaceboom.