摘要
通过偏轴拉伸实验研究了因纱线细度变化而引起的不平衡2.5D碳纤维机织预制体(2.5D CFWPs)的面内剪切变形性能,实验材料包括4组不平衡2.5D CFWPs试样和1组平衡2.5D CFWPs试样。观察了不平衡2.5D CFWPs试样的典型宏观变形形貌和细观结构变化;对比了不平衡试样和平衡试样的剪切角和拉伸载荷变化;通过归一化处理,详细分析了纱线细度对预制体面内剪切变形的影响。结果表明:不平衡2.5D CFWPs试样典型变形形貌呈左右不对称形态,且纱线呈"S"型或"Z"型抽拔;经纬纱细度组合为792 tex×396 tex(表示经纱细度为792 tex,纬纱细度为396 tex)和396 tex×792 tex的不平衡2.5D CFWPs试样的偏轴拉伸性能基本相同,另两组不平衡试样(经纬纱细度组合为198 tex×792 tex和792 tex×198 tex)的偏轴拉伸性能也基本相同;平衡试样的拉伸载荷明显大于不平衡试样,在达到剪切锁紧后,平衡试样载荷快速上升,不平衡试样载荷上升缓慢;对拉伸载荷归一化处理后,剪切角小于20.81°时, 5组2.5D CFWPs试样剪切力基本相同,在20.81°~30.02°时, 4组不平衡试样剪切力基本相同。
The in-plane shear properties for the unbalanced 2.5 D carbon fibre woven preforms(2.5 D CFWPs) due to the changing of yarn linear density were investigated by the bias-tensile test. The test materials including 4 kinds of unbalanced 2.5 D CFWPs and 1 kind of balanced 2.5 D CFWPs. The typical bias-tensile modes and meso-structures were observed;The shear angles and bias-tensile load of balanced and unbalanced samples were compared and analyzed;Normalized method was used to analyze the influence of yarn linear density on the in-plane shear properties. The results show that the typical bias-tensile modes of the unbalanced 2.5 D CFWPs are asymmetric S-shape or Z-shape. The bias-tensile properties of unbalanced 2.5 D CFWP samples with yarn linear density of 792 tex×396 tex(the warp is 792 tex and the weft is 396 tex) are similar, the other 2 unbalanced samples are similar too;The bias-tensile load of the balanced samples is larger than the unbalanced, After locking angle, the bias-tensile load of the balanced samples is rising rapidly and the unbalanced is rising slowly;The normalized shear forces of the all 5 kinds of 2.5 D CFWP samples are similar when the shear angle is less than 20.81°, and the 4 kinds of unbalanced samples are similar when the shear angle is between 20.81°-30.02°.
作者
关留祥
李嘉禄
焦亚男
杨志
房倩倩
GUAN Liuxiang;LI Jialu;JIAO Ya’nan;YANG Zhi;FANG Qianqian(Key Laboratory of Advanced Textile Composites(Ministry of Education),Institute of Textile Composites,School of Textile Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2020年第2期293-301,共9页
Acta Materiae Compositae Sinica
基金
天津市高等学校创新团队项目(TD13-5043)
