关键词: 屈曲分析, 复合材料, 夹芯层合壳, 有限单元法

Abstract: Sandwich laminated rotational shells are important parts of spacecraft, which are often connected with other components. The complicated local buckling modes are frequently caused by the local stress concentration at the joint areas. A finite element computational strategy of analyzing such structures is presented in this paper. A kind of 32-node and 3-layer shell element with relative Degrees-Of-Freedom (DOF) is developed for modeling sandwich laminated shells, which avoids resorting to the customary shell rotation DOFs and therefore can be easily connected with other solid type elements. All of these features enable its promising application in the simulation of modern sandwich structures, even if with varying thickness or complicated joint parts. For the buckling analysis of large-scale rotationally periodic aerospace sandwich structures, a computational strategy that combines the rotationally periodic FE method and this new shell element is adopted in this paper. The numerical results show the efficiency and advantages of this computational strategy.

Key words: buckling analysis, composite material, sandwich laminated shell, finite element method