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基于材料细观结构,建立了缝纫泡沫夹芯复合材料的刚度预测模型,并进行了刚度性能的相关试验验证。其中,对缝纫复合材料层合面板部分,考虑了缝纫角对单胞尺寸和富脂区大小的影响,以及缝纫前后层合面板厚度的变化对复合材料面板纤维体积含量的影响,采用改进的纤维弯曲模型计算了缝纫复合材料层合面板的刚度;对缝纫增强的泡沫夹芯部分,把缝线树脂柱看作是泡沫基体中的增强相,将其简化为特殊的单向增强复合材料,提出了用串并联组合模型来预测其刚度。试验测试了缝纫泡沫夹芯复合材料板试件的刚度。应用本文模型对缝纫层合面板和缝纫泡沫夹芯复合材料板的刚度进行预测,结果均与试验结果吻合较好。采用理论模型系统研究了缝纫参数和结构参数对缝纫泡沫夹芯复合材料刚度的影响。
Based on the mesostructure of the material, the stiffness prediction model of the seamed foam sandwich composite was established, and the related experimental verification of the stiffness performance was carried out. The effect of sewing angle on cell size and fat-free zone size, and the influence of the thickness of the laminated veneer before and after the sewing on the fiber volume content of the composite material panel were considered for the sewing composite laminates. The modified fiber The bending model was used to calculate the stiffness of the laminated composite panel. For the stiffened part of the foam, the suture resin column was regarded as the reinforcing phase in the foam matrix, which was simplified as a special unidirectional reinforced composite. The combination of series and parallel models to predict the stiffness. The test tested the stiffness of the foamed, foam-seamed composite panel specimens. The stiffness of the stitched laminated panels and the stitched foam sandwich composite panels are predicted by the model in this paper. The results are in good agreement with the experimental results. The effect of sewing parameters and structural parameters on the stiffness of stitched foam sandwich composites was studied using a theoretical model system.