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Title: Integrated peak spectral intensity for in situ crack detection
Authors: Tay, C.J. 
Shang, H.M. 
Sajan, M.R. 
Keywords: Fatigue
In situ crack detection
Issue Date: Jun-1997
Citation: Tay, C.J.,Shang, H.M.,Sajan, M.R. (1997-06). Integrated peak spectral intensity for in situ crack detection. Optics and Laser Technology 29 (4) : 187-191. ScholarBank@NUS Repository.
Abstract: This paper presents an integrated peak spectral intensity method for in situ detection of a fatigue crack in a metallic material. The method employs a laser beam to illuminate the notch root of a central slot machined on test specimens. The diffracted images are digitized, recorded and processed on a personal computer. Subsequent image processing and analysis yield information from which fatigue crack initiation on the specimen is determined. The technique is applied to aluminium alloy specimens subjected to a cyclic tensile load with a constant stress amplitude. Unlike previous techniques, the present technique enables recording of speckle images and the subsequent detection of fatigue crack initiation without the necessity of unloading the test specimen from the testing machine. © 1997 Elsevier Science Ltd.
Source Title: Optics and Laser Technology
ISSN: 00303992
Appears in Collections:Staff Publications

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