The concept of 3D woven sandwich structures is the most amenable technology that attracts the current design engineers with their advantages over foams and honeycomb core-based composites. A thorough investigation on the mechanical endurance of sandwich structures reinforced with woven spacer fabrics reveals that their compression and shear properties are at stake with the increase in their core heights. In this work, a new concept for the sandwich structure, 3D spacer fabrics with integrally woven connecting walls in three different configurations were designed and fabricated. Further, the woven samples were consolidated into composite structures using epoxy resin and their improved structural effectiveness was studied by loading them under compression and bending loads. From these test results, it was evident that suitable modification of woven connecting wall configuration can successfully produce energy absorbent ultra-lightweight hollow structures. T-peel test carried on a replicate model of the junction formed in the structures revealed that the structures show node lamination prone failures. It is expected that this study will prove to be an experimental database for designing foamless sandwich structural composites with better stability at higher thickness.

中文翻译：

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3D 编织夹层结构中核心结构的增强调整对其复合材料的弯曲和压缩性能的影响

3D 编织夹层结构的概念是最适合当前设计工程师的技术，它比泡沫和蜂窝芯复合材料更具优势。对用机织间隔织物增强的夹层结构的机械耐久性的彻底调查表明，随着其核心高度的增加，它们的压缩和剪切性能受到威胁。在这项工作中，夹层结构的新概念，设计和制造了具有三种不同配置的整体编织连接壁的 3D 间隔织物。此外，使用环氧树脂将编织样品固结成复合结构，并通过在压缩和弯曲载荷下加载它们来研究其改善的结构有效性。从这些测试结果来看，很明显，对编织连接墙的结构进行适当的修改可以成功地生产出吸能超轻中空结构。对结构中形成的连接点的复制模型进行 T 型剥离测试表明，这些结构显示出节点层压易发生故障。预计这项研究将被证明是一个实验数据库，用于设计在更高厚度下具有更好稳定性的无泡沫夹层结构复合材料。