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整体屈曲是缝纫复合材料夹芯板的一种重要失效模式。考虑到缝纫夹芯复合材料板一般较厚且面板与芯层厚度相差较大,缝纫工艺对夹芯板刚度影响较大的特点,基于高阶剪切理论,编制了缝纫泡沫夹芯复合材料板稳定性分析的有限元程序。利用该程序对多个算例进行了计算,所得临界屈曲应力与文献及试验结果吻合很好。同时,讨论了不同边界条件下缝纫泡沫夹芯复合材料板稳定性随缝纫参数(包括针距、行距和缝纫针半径)以及结构参数(包括面板铺层角、芯层厚度和缝纫夹芯板边长)的变化规律。
Overall buckling is an important failure mode for sewing composite sandwich panels. In view of the fact that the thickness of the stitched sandwich composite panel is generally thick and the thickness of the panel differs greatly from the thickness of the core layer and the sewing process has a great influence on the stiffness of the sandwich panel, based on the high-order shear theory, Stability analysis of the finite element program. A number of examples were calculated using this program, and the critical buckling stress obtained was in good agreement with the literature and experimental results. At the same time, the stability of stitched foam sandwich panels under different boundary conditions is discussed with the parameters of stitching (including stitch length, stitch length and sewing needle radius) and the structural parameters (including panel lamination angle, core thickness and sewing sandwich panel edge Long) changes in the law.