缝合参数对缝纫平纹玻璃纤维织物复合材料弯曲性能的影响研究

本文参照美国ACT计划设计的最优缝合参数,用无捻Kevlar纤维缝合成不同缝合密度的预成型体,讨论并优化了缝合过程中重要参数的影响。采用改良的缝合机器,使缝合质量大幅提升,并发展了加固嵌板的缝合技术。本文采用VARTM工艺制备玻璃纤维织物增强复合材料,通过比较不同缝合密度下的力学性能,讨论了VARTM工艺中缝合密度对材料性能的影响。实验结果表明,在一定的缝合密度下,缝合复合材料能表现出最好的冲击韧性。随着缝合密度的提高,复合材料的弯曲性能下降,但是层间性能有所提升。

EFFECTS OF STITCHING PARAMETERS ON FLEXURAL PROPERTIES OF THE GLASS FABRIC REINFORCED LAMINATED COMPOSITES

Preforms of different stitch densities are stitched by untwist Kevlar on the optimal stitch parameters designed in the ACT(Advanced Composites Technology) program of America.The influences of important parameters in stitch process are discussed and optimized.The recent stitch machine is innovated,thus preform quantity is greatly enhanced and the stitch technique stiffened panel is developed.In the research,the glass fabric reinforced laminated composites are obtained under VARTM process.The influences of stitch density in VARTM process are investigated.By comparing the different mechanical performances between stitched composites of various stitch densities,general conclusions are drawn.Provided consistent experiment environment,the best impact toughness performs under a certain stitch density.With the stitch density increased,the flexural properties reveal a declination while the interlaminar properties are enhanced.