Bias-tensile properties for the unbalanced 2.5D carbon fibre woven preforms
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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。Abstract: The in-plane shear properties for the unbalanced 2.5D carbon fibre woven preforms (2.5D CFWPs) due to the changing of yarn linear density were investigated by the bias-tensile test. The test materials including 4 kinds of unbalanced 2.5D CFWPs and 1 kind of balanced 2.5D 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 2.5D CFWPs are asymmetric S-shape or Z-shape. The bias-tensile properties of unbalanced 2.5D 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 2.5D 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°.
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Keywords:
- 2.5D weaving /
- preform /
- bias-tensile test /
- deformation /
- shear angle
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期刊类型引用(3)
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