Monitoring fatigue damage of an adhesive joint using fiber optics sensors
Journal
Journal of Physics: Conference Series
Journal Volume
843
Journal Issue
1
Date Issued
2017
Author(s)
Abstract
Adhesive joining has many merits over traditional joining techniques. However, adhesive joints are susceptible to damage and degradation caused by service loading. If such degradation went undetected, serious structural failures and catastrophic outcome might follow. It is difficult and economically unviable to carry out regular examination on the joint integrity using conventional non-destructive evaluation techniques, especially in the case of practical structures with large scale adhesive joining. In this work, optical fibers with Bragg grating (FBG) sensors embedded in single lap joints has been demonstrated to be able to detect internal damage caused by monotonic and cyclic loading. FBG sensor works by reflecting specific wavelengths from a broad spectrum incident light. The wavelengths reflected depend on the strain on the FBG. Internal damages will perturb the strain field in the joint and thus change the shape of the reflected FBG spectrum. With embedded FBG sensors, it is possible to achieve on-line monitoring of the joint integrity in an economical way.
SDGs
Type
conference paper