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Detection and Sizing of Fatigue Cracks in Thin Aluminum Panel with Rivet Holes  

Kim, Jung-Chan (Department of Mechanical Engineering, Inha University)
Kwon, Oh-Yang (Department of Mechanical Engineering, Inha University)
Publication Information
Journal of the Korean Society for Nondestructive Testing / v.27, no.1, 2007 , pp. 38-47 More about this Journal
Abstract
The initiation of fatigue cracks in a simulated aircraft structure with a series of rivet holes was detected by acoustic emission(AE), then the crack length was determined by surface acoustic wave(SAW) technique. With the initiation and growth of fatigue cracks, AE events increased intermittently to form a stepwise incremental curve of cumulative AE events whereas the crack length increased more or less monotonically. With the SAW technique employed, the crack sizing for 13 different cracks including some short cracks was performed. With the reference to the measurement by traveling microscope, cracks in the range of $1{\sim}8mm$ long were reliably sized by the SAW technique. Although it was impossible to size the short fatigue cracks in the range shorter than 1 mm, the SAW technique still appeared practically useful for a range of crack lengths often found in aircraft structures.
Keywords
Acoustic Emission(AE); Short Fatigue Crack; AE Source Location; Surface Acoustic Wave(SAW); Crack Sizing;
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Times Cited By KSCI : 2  (Citation Analysis)
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