自动铺丝成型构件缺陷在线检测技术进展

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.