自动铺丝成型构件缺陷在线检测技术进展

自动铺丝(AFP)工艺为连续纤维增强复合材料结构提供了高效和稳定的成型方法，但铺放工艺参数和成型装备性能的不稳定极易造成制件出现间隙、重叠、纤维波纹等各类缺陷，从而严重影响整体结构的机械性能及使用寿命，因此，利用在线检测系统对成型过程中铺层表面或内部缺陷进行实时识别与评估尤为重要。归纳了复合材料铺放过程中常见缺陷的产生原因、表现形式及其对结构产品综合性能的影响。基于不同检测原理综述了复合材料制件自动铺丝成型过程在线检测系统的发展及应用特点，涵盖激光技术、可见光图像技术、热成像技术及布拉格光纤光栅技术等。总结了当前在线检测系统存在的问题，并展望了其未来发展趋势。 

Review on automated fiber placement induced defects and their online monitoring technology

The automated fiber placement (AFP) process has become a promising solution to the fabrication of composite structures, due to its efficiency and stability. However, the instability of the lay-up process parameters and the performance of the equipment can easily cause such defects as gaps, overlaps, and waviness, which severely affect the overall performance and service life of composite structures. Therefore, automatic identification and evaluation of the defects on the surface or inside the laminates during the AFP process through in-situ monitoring systems are of particular importance. In this paper, the causes and appearance of common defects on the ply during the AFP process and their effects on the overall performance of products are first concluded. Then, the advantages, development, and applications of online monitoring systems based on different detection techniques are systematically reviewed, mainly including laser technology, image recognition technology, thermal imaging technology, and fiber Bragg grating technology. Finally, the limitations in the current online monitoring systems are summarized, and outlooks for their future trends are given.