Evaluation of Fatigue Damage Monitoring of Single-Lap Composite Adhesive Joint Using Conductivity
Journal
Polymers
Journal Volume
16
Journal Issue
16
Start Page
2374
ISSN
2073-4360
Date Issued
2024-08-22
Author(s)
Shun-Hsuan Huang
DOI
10.3390/polym16162374
Abstract
The widely used adhesive joining technique suffers from the drawback of being unable to be dismantled to examine for degradation. To counteract this weakness, several structural health monitoring (SHM) methods have been proposed to reveal the joint integrity status. Among these, doping the adhesive with carbon nanotubes to make the joint conductive and monitoring its electrical resistance change is a promising candidate as it is of relatively low cost and easy to implement. In this work, resistance change to monitor fatigue debonding of composite single-lap adhesive joints has been attempted. The debonded area, recorded with a liquid penetrant technique, related linearly to the fatigue life expended. However, it correlates with the resistance change in two different trends. Scanning electron microscopy on the fracture surface reveals that the two trends are associated with distinct failure micromechanisms. Implications of these observations on the practical use of the resistance change for SHM are discussed
Subjects
adhesive joint
carbon nanotubes
electrical resistance change
fatigue debonding
structural health monitoring
Publisher
MDPI AG
Type
journal article