缝合增强泡沫夹芯结构复合材料力学性能研究

采用机械缝合设备连续制备了"X"型构型缝合增强泡沫夹芯结构预成型体,并采用真空导入模塑工艺(VIMP)整体成型了缝合增强泡沫夹芯结构复合材料。实验研究了面板纤维布层数、面板纤维布穿透缝合层数、缝合角度、缝合针距及纱线股数对缝合增强泡沫夹芯结构复合材料弯曲性能和平压性能的影响规律。实验结果表明:与未缝合结构相比,缝合结构在质量未明显增加的情况下,弯曲性能和压缩性能得到了显著提高,其弯曲刚度最大提高了4.66倍,破坏载荷最大提高了13.8倍;压缩强度和压缩模量最大分别提高了26.2倍和15.2倍。

MECHANICAL PERFORMANCE OF STITCHED FOAM CORE SANDWICH COMPOSITES

The stitched foam core sandwich structure preforms were prepared by new type of stitched machine.Then the vacuum infusion molding process (VIMP) was used to fabricate the stitched foam core sandwich composites.Then the influences of fiber panel layers,fiber panel penetrating layers,stitched angles,stitched step length,the numbers of yarns on the bending and the compression performance were carefully studied.The results show that,compared with the unstitched structure,stitching can significantly improve the bending and compression properties of the composites.The bending stiffness of the structure increased by 4.66 times and the breaking load increased by 13.8 times at most.Simultaneously,the compression strength and compression modulus increased by 26.2 times and 15.2 times at most.