Crack luminescence as an innovative method for detection of fatigue damage

Conventional non-destructive testing methods for crack detection provide just a snapshot of fatigue crack evolution at a specific location in the moment of examination. The crack luminescence coating realizes a clear visibility of the entire crack formation. The coating consists of two layers with d...

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Bibliographic Details
Published in:Journal of sensors and sensor systems 2018-04, Vol.7 (1), p.259-266
Main Authors: Makris, Ruben, Hille, Falk, Thiele, Marc, Kirschberger, Dirk, Sowietzki, Damian
Format: Article
Language:English
Subjects:
Analysis
Coating
Crack propagation
Cracking (Materials)
Damage detection
Destructive testing
Fatigue (Materials)
Fatigue cracks
Fatigue failure
Fatigue tests
Flaw detection
Fluorescence
Fracture mechanics
Inspection
Luminescence
Methods
Nondestructive testing
Preventive maintenance
Ultraviolet radiation
Visibility
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Summary:Conventional non-destructive testing methods for crack detection provide just a snapshot of fatigue crack evolution at a specific location in the moment of examination. The crack luminescence coating realizes a clear visibility of the entire crack formation. The coating consists of two layers with different properties and functions. The bottom layer emits light as fluorescence under UV radiation. The top layer covers the fluorescing one and prevents the emitting of light in case of no damage at the surface. Several different experiments show that due to the sensitive coating even the early stage of crack formation can be detected. That makes crack luminescence helpful for investigating the incipient crack opening behavior. Cracks can be detected and observed during operation of a structure, making it also very interesting for continuous monitoring. Crack luminescence is a passive method and no skilled professionals are necessary to detect cracks, as for conventional methods. The luminescent light is clearly noticeable by unaided eye observations and also by standard camera equipment, which makes automated crack detection possible as well. It is expected that crack luminescence can reduce costs and time for preventive maintenance and inspection.
ISSN:2194-878X
2194-8771
2194-878X
DOI:10.5194/jsss-7-259-2018