Characterization of Stress Corrosion Cracking Using Laser Ultrasonics [Final Report]
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2008-08-31
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TRIS Online Accession Number:01643089
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Edition:Final Report
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Abstract:This paper focuses on the application of laser ultrasonics to the characterization of stress corrosion cracking (SCC). SCC is the phenomenon in metals wherein the simultaneous presence of tensile stress, a corrosive environment and a susceptible metallurgy leads to the nucleation and propagation of highly irregular and complex cracks, usually found in closely spaced clusters or colonies. In pipelines, SCC has been a particularly elusive and challenging problem. Several pipeline failures around the world have been attributed to SCC since its discovery in pipelines in the 1960s. Laser ultrasonics offers a number of significant benefits for the sizing of SCC cracks, including small footprint on the pipe, rapid scanning and high bandwidth. Laser generation produces a rich admixture of ultrasonic waves, covering many wave types, directions and frequencies. Finite difference modeling offers a very promising pathway to harnessing these waves for effective crack depth measurement.
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