不同手工制备方法对预浸料捻子条质量的影响

捻子条是用于复合材料梁肋结构三角空隙的填充材料,为优化捻子条手工制备方法,为工程实践及自动化生产提供依据,分别采用滚卷式和铺层式2种手工制备方法制备了预浸料捻子条,并通过对预浸料捻子条外形尺寸、微观结构及力学性能的表征,探索了不同手工制备方法对捻子条质量的影响。结果表明:2种方法制备的预浸料捻子条在外形尺寸上差别不大,纤维体积分数均约为60%、孔隙率均约为3%;但2种方法制备的捻子条在内部缺陷形式及力学性能方面差别较大,滚卷式制备的捻子条内部缺陷小而分散,纤维排列混乱,在弯曲载荷下产生纤维断裂失效;铺层式制备的捻子条内部缺陷大而连续,纤维准直度好,在弯曲载荷下产生分层断裂失效。

Effects of different hand-made preparation methods on quality of prepreg radius fillers

Radius filler is a kind of filling material used in triangle gap of composite beam and rib structure. To optimize the hand-made preparation method of radius fillers and provide the basis for engineering practice and automatic production, the prepreg radius fillers were prepared by rolled mode and laminated mode respectively. To investigate the influence of different hand-made preparation methods on quality of radius fillers, the boundary dimension, microstructure and mechanical property of prepreg radius fillers were characterized. The results show that there is little difference in boundary dimension of the prepreg radius fillers prepared by rolled mode and laminated mode. The fiber volume fraction is all around 60%, and the void content is all around 3%. But the form of inner defects and mechanical property of the radius fillers differ significantly. For the radius fillers obtained by rolled mode, the inner defects are small and scattered, fibers arrange in disorder and bending failure mode is fiber fracture. For the radius fillers obtained by laminated mode, the inner defects are large and continuous, fibers arrange neatly and collimated, the bending failure mode is delamination fracture.