Integrated peak spectral intensity for in situ crack detection

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...

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Bibliographic Details
Published in:Optics and laser technology 1997, Vol.29 (4), p.187-191
Main Authors: Tay, C.J., Shang, H.M., Sajan, M.R.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fatigue
in situ crack detection
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
lasers
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Optical instruments, equipment and techniques
Physics
speckle
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Summary: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.
ISSN:0030-3992
1879-2545
DOI:10.1016/S0030-3992(97)00003-0