复合材料科学与工程Issue(4)：11-19,9.DOI:10.19936/j.cnki.2096-8000.20250428.002
不同缝合密度和层数的单向碳纤维织物复合材料结构与性能研究
Study on the structure and properties of unidirectional carbon fiber fabric composite materials with different stitch densities and layers
摘要
Abstract
In order to investigate the structure and mechanical properties of stitched composite materials,aramid fibers were utilized as stitch threads and a modified lock stitching technique was employed to prepare unidirectional carbon fiber fabric preforms with different stitch densities and numbers of stitch layers.Composite materials were prepared by vacuum-assisted resin transfer molding(VARTM)process,and their internal structure as well as typeⅠinterlaminar fracture toughness,impact performance,bending and compression properties were systematically in-vestigated.The results show that the composite material exhibits the best comprehensive mechanical properties when stitched 9 layers at a density of 4 mm×4 mm.Compared with the unstitched composite material,the typeⅠfracture toughness increases by 50.8%,the maximum impact load increases by 46.2%,the energy absorption rate increases by 27.0%,the bending strength increases by 15.4%,the compressive strength increases by 4.1%,and the com-pressive modulus does not decrease.Conversely,for composite materials stitched with 3 layers at once,the bending and compression properties decrease with different stitch densities both decrease.After analysis,it is found that in-creasing the stitch density effectively enhance the interlayer performance of composite materials,while increasing the number of stitch layers help to reduce the impact of stitching on in-plane performance,providing important refer-ences for selecting stitching process parameters.关键词
改进锁式缝合/缝合密度/缝合层数/复合材料/力学性能Key words
modified lock stitching/stitch density/number of stitch layers/composites/mechanical property引用本文复制引用
秦成,查一斌,张联合,任浩,程亚男,李永丰,刘勇,张辉..不同缝合密度和层数的单向碳纤维织物复合材料结构与性能研究[J].复合材料科学与工程,2025,(4):11-19,9.基金项目
国家重点研发计划(2022YFB3709202) （2022YFB3709202）
江苏省重点研发计划(BE2021014-3) （BE2021014-3）
