3D woven spacer fabrics connected with woven cross‐links and forming tunnels of trapezoidal shape were produced in single and double level configuration with four different cell wall opening angles in each configuration. The sandwich composites produced from these spacer fabrics were then analyzed for their out‐of‐plane compressive and flexural properties to study their failure loads, energy absorbency, and failure modes. With an increase in the cell wall opening angles, compressive load and specific compressive load increased for single and double level structures, but the same properties were found to be poor for double level structures compared to their single level counterparts. Absorbed energy/volume was also found to be lower for double level composites. The bending load and specific bending load values increased with increase in cell wall opening angle, with double level structures performing better at each cell wall opening compared to their single level counterparts. But the flexural stress of double level structures was lower than that of their corresponding single level structures. The outcomes of this study can be used in designing and manufacturing of multilevel spacer structures with different cell geometrical parameters for specific end use requirements.

中文翻译：

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单层和双层结构的3D编织间隔层夹芯复合材料力学性能的比较分析

3D编织间隔织物与编织交联连接并形成梯形形状的隧道以单层和双层结构生产，每种结构具有四个不同的孔壁开口角度。然后分析了由这些间隔织物制成的三明治复合材料的面外压缩和挠曲特性，以研究其破坏载荷，能量吸收能力和破坏模式。随着单元壁开口角度的增加，单层和双层结构的压缩载荷和比压缩载荷增加，但是与单层结构相比，双层结构的相同性能却很差。还发现双层复合材料的吸收能量/体积较低。弯曲载荷和比弯曲载荷值随单元壁开口角度的增加而增加，双层结构在每个单元壁开口处的性能均优于其单层结构。但是双层结构的弯曲应力低于相应的单层结构。这项研究的结果可用于设计和制造具有不同电池几何参数的多层间隔结构，以满足特定的最终用途要求。