整体缝合夹芯结构复合材料力学性能

Mechanical performance of integrated stitched sandwich composite

所设计的新型整体缝合泡沫夹芯复合材料结构,能够避免一般斜缝方式引起纤维交叉损坏的弊端。采用真空导入模塑工艺制备整体缝合泡沫夹芯结构复合材料,研究缝合结构、缝合方式以及缝合纱线用量对整体缝合泡沫夹芯复合材料平压力学性能和弯曲性能的影响。结果表明,新型缝合结构在保证平压力学性能的同时,相比于垂直缝合结构弯曲破坏载荷提高了94.4%;穿透缝合方式能够显著提高试样的平压强度和弯曲破坏载荷;随着缝合纱线用量的增加,整体缝合泡沫夹芯复合材料的压缩和弯曲性能显著提高。

The designed new type stitched sandwich structure of composite materials can avoid the disadvantages of fiber cross caused by the traditional angled stitch. The integrated stitched sandwich composite were prepared by VIMP（ Vacuum Infusion Molding Process）. The flatwise compression test and the three-point bending test were employed to study the effects of stitching structure,stitching mode and stitching yarn on compression properties and bending properties. Results show that the integrated stitched sandwich composites have excellent compression mechanical properties. Compared with the vertical structure,the flexure failure load is increased by 94. 4%. Compared with the unpenetrate stitched mode,the compressive strength and the bending load of penetrating stitched mode are improved significantly. The compression properties and the flexure properties of stitched sandwich composite are improved with the increase of stitching yarn.