TITLE:
Self-Sensing TDR for Bearing Failure Detection of CFRP Laminate Fastener Hole with Particular Reference to the Effect of Fasteners
AUTHORS:
Akira Todoroki, Keisuke Ohara, Yoshihiro Mizutani, Yoshiro Suzuki, Ryosuke Matsuzaki
KEYWORDS:
Composites, Time Domain Reflectometry, Self-Sensing, Bearing Failure, Fasteners, Monitoring
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.5 No.3,
June
11,
2015
ABSTRACT: Carbon fiber reinforced polymer composites (CFRP) have been applied to aerospace and automobile
structures. For many CFRP structures, mechanical metallic fasteners are usually adopted. For
the fasteners used in internal structures such as a wing box, the damage to the CFRP structures
around fastener holes is visually quite difficult to find. A simple method to find the damage around
fastener holes is required. In this study a self-sensing time domain reflectometry (TDR) method is
newly applied to detect bearing failure around the fastener holes of CFRP structures. A microstrip-line method is generally used to create a transmission line. When the transmission line is
mounted near the metallic fasteners, they may affect the impedance of the transmission line. In
this study, the effect of distance between the fasteners and the transmission line was numerically
investigated using a finite difference time domain analysis method. After finding the appropriate
distance, experiments were performed to detect the bearing failure around a fastener hole. The
experiments showed the performance of the self-sensing TDR for detecting bearing failure.