Characterisation of random carbon fibre composites from a directed fibre preforming process: The effect of fibre length
Characterisation of random carbon fibre composites from a directed fibre preforming process: The effect of fibre length
复制标题
定向纤维预成型过程中随机碳纤维复合材料的表征：纤维长度的影响
DOI：
10.1016/j.compositesa.2005.12.028
复制
发表时间：
2006
影响因子：
8.7
通讯作者：
C. Rudd
中科院分区：
文献类型：
--
作者：
L. Harper;T. Turner;N. Warrior;C. Rudd
研究了纤维长度对二维无规碳纤维复合材料拉伸性能的影响。从碳/环氧树脂板使用定向纤维预成型工艺生产的机械性能数据，丝束长度为3毫米至115毫米。较短的长度改善了预成型体的覆盖率，并提供了越来越高的强度，而模量是独立的纤维长度。诱导不同程度的分离以将24 K丝束分离成更小的束。通过最大限度地提高刚度和强度，分别增加了18.9%和44.1%。预测刚度和强度的分析模型与实验数据进行了比较，并观察到一个很好的相关性，因为尺度效应的高度recrystised纤维。为了更准确地预测纤维束的强度，根据纤维束内的长丝数，提出了一个临界丝束长度的表达式。实验结果证实，临界丝束长度与丝束支数成正比。
The effect of fibre length on the tensile properties of 2D random carbon fibre composites is examined. Mechanical property data from carbon/epoxy plaques produced using a directed fibre preforming process is presented for tow lengths from 3mm to 115mm. Shorter lengths improved preform coverage and gave increasingly higher strength whilst modulus was independent of fibre length. Varying degrees of filamentisation were induced to separate 24K tows into smaller bundles. By maximising the level of filamentisation the stiffness and strength were increased by 18.9% and 44.1%, respectively. Analytical models for predicting stiffness and strength are compared against experimental data and a good correlation is observed for highly filamentised fibres because of scale effects. An expression for critical tow length has been developed for more accurate strength prediction, based upon the number of filaments within the bundle. Experimental results confirm that the critical tow length is proportional to the tow filament count.