再生碳纤维铺层取向优化及复合材料性能  

Recycled carbon fiber layering orientation optimization and its performance of composites

作　　者：黄海鸿[1] 孔令成 刘威豪 阮浩达 HUANG Haihong;KONG Lingcheng;LIU Weihao;RUAN Haoda(School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China;School of Advanced Manufacturing Engineering,Hefei University,Hefei 230601,China)

机构地区：[1]合肥工业大学机械工程学院,合肥230009 [2]合肥学院先进制造工程学院,合肥230601

出　　处：《复合材料学报》2024年第7期3525-3535,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金联合基金(U20A20295)。

摘　　要：回收得到的再生碳纤维(RCF)多为蓬松杂乱的短纤维束,基于湿法纤维取向技术可对其重新取向。传统纤维增强复合材料通常将纤维沿单向铺层,对开孔制件难以完全发挥纤维的增益效果,通过纤维曲线铺层可以提高复合材料的结构性能。本文通过设计纤维分散实验,研究了一定RCF含量与不同浓度羟乙基纤维素(HEC)的最优配置参数。利用自行搭建的纤维取向路径可调控装置,将制备的分散液铺放得到不同轨迹和形状的纤维毡,基于二维快速傅里叶变换(2D FFT)评价RCF的取向效果。通过模压成型制备RCF/环氧树脂(EP)复合材料开孔试样,分析了不同铺层路径对开孔试样承载能力的影响。结果表明:当6 mm RCF含量为6 g/L时,最优HEC浓度为14 g/L;按曲线路径制备的开孔试样有效减少开孔处的应力集中,较无序路径和水平路径开孔试样,极限载荷分别提高了69.5%、35.9%。研究拓宽了RCF/EP复合材料结构的设计自由度,为实现RCF材料的高性能再利用提供了参考。Recycled carbon fibers(RCF)are mostly fluffy and disorganized short fiber bundles,which can be reoriented based on wet fiber orientation technology.Conventional fiber-reinforced composites are usually layered with fibers in a unidirectional direction,which makes it difficult to fully utilize the gain effect of the fibers on openhole parts,but the structural properties of the composites can be improved by curved layups of the fibers.The optimal configuration parameters of certain RCF content with different concentrations of hydroxyethyl cellulose(HEC)were investigated by designing fiber dispersion experiments.Using the self-constructed fiber orientation path control device,the prepared dispersion was spread to obtain fiber mats with different trajectories and shapes,and the orientation effect of RCF was evaluated based on a two-dimensional fast Fourier transform(2D FFT).The open-hole specimens of RCF/epoxy resin(EP)composites were prepared by molding,and the effects of different layup paths on the load-bearing capacity of the open-hole specimens were analyzed.The results show that the optimal HEC concentration is 14 g/L when the 6 mm RCF content is 6 g/L.The open-hole specimens prepared according to the curved path effectively reduce the stress concentration at the open hole,and the ultimate load is increased by 69.5% and 35.9%compared with the open-hole specimens prepared according to the unordered path and the horizontal path,respectively.The study broadens the design freedom of RCF/EP composite structures and provides a reference for realizing high-performance reuse of RCF.

关 键 词：再生碳纤维 纤维取向 路径规划 再利用 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]