A noncontact nondestructive inspection (NDI) technique of pitting, stress-corrosion cracking and crevice corrosion using digital speckle correlation
Book
·
OSTI ID:128712
- State Univ. of New York, Stony Brook, NY (United States). Dept. of Mechanical Engineering
When the speckle pattern (laser or white light) of a corroded specimen surface is compared to that of a virgin surface, the difference can be quickly and clearly revealed by the cross-correlation coefficient of the two speckle patterns. This technique can reveal pitting corrosion areas as small as 5mm x 5mm wherein exists a cluster of pits of 0.3mm (diameter) and 0.1 mm (depth). An artificial stress-corrosion crack was used to demonstrate the validation of this method for detection of stress-corrosion cracking. For detection of crevice corrosion, laser illumination must be applied. Digital speckle correlation takes both the advantage of digital image correlation and laser speckle properties. The speckle decorrelation coursed by out-of-plane displacement in the region with a crevice corrosion underneath the specimen`s surface is bigger than without defects. This different is calculated by digital correlation algorithm, which reveals the existence of crevice corrosion.
- OSTI ID:
- 128712
- Report Number(s):
- CONF-950304--
- Country of Publication:
- United States
- Language:
- English
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