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Detection of Fatigue Cracks Using Light Emitting Diodes

	International Journal of Scientific Research and Engineering Development (IJSRED)	Full Text:
	Published Issue : Volume-4 Issue-1
	Year of Publication : 2021
	Unique Identification Number : IJSRED-V4I1P111
	Authors : Raguraman D, Arul K, Manavalan S, Raja E
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Abstract :

Detection of cracks through non destructive methods is vital in present decade and many automotive applications involve repeated stresses and study of fatigue crack is thus essential. The identification of the fatigue crack indicates the condition of fatigue damage evolution at the time of operation, which is normally not within operating environment. The crack luminescence method applied here recognises a clear visibility of the occurring and growing crack in functional part at the time of processing. Various proven experiments show that initiation of crack may be identified at a nucleation stage itself by the assumption that it entered the outer surface due to sensitive coating. There are consecutive layers along with various properties and functions in the coating. Under Ultra Violet radiation, the lower layer emits light like fluorescence. In the event of no harm to the floor, the upper layer protects the fluorescent layer and the reflection of light is being neglected. In the work, for external layer's flaw detection, the light from the Light Emitting Diode (LED) is clearly detectable by visual assessment and also by regular camera systems which also allows possible automatic crack detection. Crack luminescence is expected to improve structural safety, in addition to minimising costs and time for investigations and preventive maintenance.