夹层梁总体屈曲及皱曲的有限元计算

皱曲是夹层结构的一种短波屈曲模式，通常发生于夹心较厚或夹心刚度较低的情况。由于模型规模的限制，在常规有限元建模时通常将夹层板模拟为二维板单元，这种方法忽略了面板和夹心在厚度方向上的相互作用，无法计算出皱曲模式。针对上述问题，本文首先介绍了一个计算夹层结构总体屈曲和皱曲的统一理论，并将此理论的计算结果作为理论解。为了同时...

Finite element analysis of sandwich overall buckling and wrinkling

Wrinkling, a kind of short-wave buckling mode of sandwich Structures, usually occurs when the core is thick or soft. Limited by model scale sandwich panel is usually modeled using shell element during finite element buckling analysis. This approach ignores the interactions of the face sheet and the core in the thickness direction and can not calculate the wrinkling mode. This paper developed a two-dimensional cross-section finite element model of the sandwich panels to analysis overall buckling and wrinkling together. Firstly, a unified theory was presented for overall buckling and wrinkling of sandwich structures. In order to calculate the overall buckling and wrinkling simultaneously, a two-dimensional cross-section details model was developed in MSC.Patran/Nastran software to analyze the control modes of two sandwich beams. The analytical results of sandwich structures were compared with the theoretical solutions. Then the ply angle effect of composite face sheet on buckling is discussed. The result obtained from the method of this paper was compared with the result obtained from the conventional modeling method. At last, some suggestions were presented to the analysis about sandwich buckling and wrinkling.