天津工业大学学报2023，Vol.42Issue(6)：24-32,46,10.DOI:10.3969/j.issn.1671-024x.2023.06.004
含减纱2.5D机织碳/环氧复合材料低速冲击损伤机制
Low-velocity impact damage mechanism of 2.5D woven carbon/epoxy composites with yarn reduction
摘要
Abstract
The 2.5D woven carbon/epoxy composites without yarn reduction,with half rows yarn reduction and with all rows yarn reduction were designed and prepared for the common yam reduction process of conical rotating members.The impact energy levels of 54 J and 72 J were set,respectively.Low-velocity impact tests were carried out on three composite materials using a drop hammer impactor,and load-time curves were obtained.Micro-CT was al-so used to carry out the damage morphology and damage quantification analysis.A macro-meso hybrid finite ele-ment model is developed based on the"local"distribution characteristics of low-velocity impact damage.Numer-ical simulations of low-velocity impacts of three composite materials were carried out to reveal the failure mecha-nisms.The results show that the mechanical response curves and damage morphology of the numerical simulation are in good agreement with the corresponding experimental results.Meanwhile,compared with without yarn re-duction.At the impact energy of 54 J,the impact damage volume increased by 21.0％and 34.8％for the speci-mens with half-row yarn reduction and whole row yarn reduction,respectively.At the impact energy of 72 J,the impact damage volume increased by 15.7％and 24.4％for the half rows yarn reduction and all rows yarn reduc-tion,respectively.It can be seen that the introduction of the yarn reduction point significantly reduces the load-bearing efficiency of the structure.关键词
减纱/2.5D机织复合材料/低速冲击/损伤机制/混合模型Key words
yarn reduction/2.5 D woven composites/low-velocity impact/damage mechanism/hybrid model分类
通用工业技术引用本文复制引用
张典堂,窦宏通,董放,江昊..含减纱2.5D机织碳/环氧复合材料低速冲击损伤机制[J].天津工业大学学报,2023,42(6):24-32,46,10.基金项目
国家自然科学基金资助项目(11702115,12072131) （11702115,12072131）
