In this study, the effect of the core thickness of the sandwich composite on its flexural strength was investigated. E-glass fibre reinforced epoxy-based laminates were used as the skin materials whereas a polyurethane foam was used as the core material with varying thickness of 5, 7, and 9 mm. The experimental/theoretical and FEA analysis were carried out. Results indicated that as core thickness increased, the axial face stresses/core shear stresses and total deformation decreased. This improved the composite structural properties. This improvement was accompanied by a minor increase in weight. A good concurrence was observed between theoretical and FEA results. These results allow us to compare and select optimum parameters for aerospace applications.

中文翻译：

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芯部厚度对聚合物泡沫夹层结构弯曲行为的影响

在这项研究中，研究了夹芯复合材料的芯厚度对其抗弯强度的影响。电子玻璃纤维增​​强的环氧基层压板用作表皮材料，而聚氨酯泡沫用作厚度分别为5、7和9 mm的芯材。进行了实验/理论和有限元分析。结果表明，随着岩心厚度的增加，轴向面应力/岩心切应力和总变形减小。这改善了复合材料的结构性能。这种改善伴随着体重的轻微增加。在理论结果和有限元分析结果之间观察到良好的一致性。这些结果使我们能够比较和选择用于航空航天应用的最佳参数。