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Materials (Basel). 2016 May 14;9(5). pii: E374. doi: 10.3390/ma9050374.

Fatigue Damage Monitoring of a Composite Step Lap Joint Using Distributed Optical Fibre Sensors.

Author information

1
Department of Mechanical & Aerospace Engineering, Monash University, Wellington Road, Clayton, VIC 3168, Australia. leslie.wong@monash.edu.
2
Department of Mechanical & Aerospace Engineering, Monash University, Wellington Road, Clayton, VIC 3168, Australia. nabil.chowdhury@monash.edu.
3
Aerospace Division, Defence Science and Technology Group, 506 Lorimer Street, Fishermans Bend, VIC 3207, Australia. John.Wang@dsto.defence.gov.au.
4
Department of Mechanical & Aerospace Engineering, Monash University, Wellington Road, Clayton, VIC 3168, Australia. wing.kong.chiu@monash.edu.
5
Department of Civil Engineering, Monash University, Clayton, VIC 3168, Australia. jayantha.kodikara@monash.edu.

Abstract

Over the past few decades, there has been a considerable interest in the use of distributed optical fibre sensors (DOFS) for structural health monitoring of composite structures. In aerospace-related work, health monitoring of the adhesive joints of composites has become more significant, as they can suffer from cracking and delamination, which can have a significant impact on the integrity of the joint. In this paper, a swept-wavelength interferometry (SWI) based DOFS technique is used to monitor the fatigue in a flush step lap joint composite structure. The presented results will show the potential application of distributed optical fibre sensor for damage detection, as well as monitoring the fatigue crack growth along the bondline of a step lap joint composite structure. The results confirmed that a distributed optical fibre sensor is able to enhance the detection of localised damage in a structure.

KEYWORDS:

adhesion; composite structure; distributed optical fibre sensor; fatigue test; step lap joint; structural health monitoring

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