Abstract
In the aircraft structure, the weight reduction is severely demanded and recently there exist many fastener joints between metal and composite parts. Therefore, it is important to investigate the mechanical behavior and evaluate the damage of bolt in composite/metal fastener joint. The authors proposed the smart bolt embedded optical fiber sensor as a monitoring instrument of the fastener joint. In the previous study, it was shown that the bolt fall in the multiple-row fastener joint can be detected by using the smart bolt, hi this study, FEM analyses for the multiple-row fastener joint of in-line array specimen were conducted assuming the looseness of a joining bolt. Based on the analytical results, it was shown that the bolt looseness around the smart bolt can be detected.
