Investigation on metal stress corrosion monitoring by laser speckle interferometry device

Jie Lu; G. P. Zou

doi:10.1117/12.865460

12 October 2010 Investigation on metal stress corrosion monitoring by laser speckle interferometry device

Jie Lu, G. P. Zou

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 765666 (2010) https://doi.org/10.1117/12.865460
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

Stress corrosion is a synergy process between material stress and corrosive media. It is one of the most devastating corrosion among all the corrosion behaviors. Often without any warning conditions occur, at high speed and resulting in great loss of property and life. It is significant to study the stress corrosion. The aim of this work is to present a real-time metal stress corrosion detection approach based on laser speckle interferometry. The specimens were Al-2A12 alloy with thickness of 2mm which were immersed in the 3.5% sodium chloride solution. Three-point bending system was employed under displacement loading mode. A series of speckle intensity images were captured by CCD sensor. In the following corrosion analysis, an approach based on 2-frame, 4-frame and 8-frame image process algorithms named inertia moment method was developed. The three-dimension results were obtained. Average intensity method was recommended to contrast due to its validity for corrosion analysis. The detailed results show the different damage tendency and potential failure region. The proposed corrosion monitoring devices and analysis algorithms has been effectively proved to be employed in practical engineering with potential applications possible.

Citation Download Citation

Jie Lu and G. P. Zou "Investigation on metal stress corrosion monitoring by laser speckle interferometry device", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 765666 (12 October 2010); https://doi.org/10.1117/12.865460

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