In this paper a comprehensive experimental study on effects of different fibre waviness characteristics on the compressive properties of unidirectional non-crimp fabrics (NCF) composites is presented. The fibre waviness ranges from periodic to random with medium to large misalignment angles. As expected, fibre waviness is found to strongly impair the compressive mechanical properties of the composite. It is demonstrated that the maximum fibre misalignment alone can be used to accurately predict strength with analytical kinking criteria. Furthermore, there is a direct correlation between waviness and a knock-down factor on stiffness with approximately 5%/degree mean fibre misalignment angle. Analysis of the extension of the misaligned regions (defects) provides additional evidence that defect extension in the transverse direction is more critical than in the longitudinal direction, supporting earlier theoretical predictions in the open literature.

本文提出了一种不同的纤维波纹度特性对单向非卷曲织物（NCF）复合材料压缩性能影响的综合实验研究。纤维波纹度的范围从周期性到随机，具有中等到较大的未对准角度。如预期的那样，发现纤维波纹度极大地损害了复合材料的压缩机械性能。结果表明，最大的纤维错位仅可用于通过分析扭折标准来准确预测强度。此外，波纹度和击倒因子之间的硬度之间存在直接关系，平均纤维未对准角度约为5％/度。