Papers by Keyword: Thickness Reduction

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Authors: Jong Ho Park, Joon Hyun Lee, Gyeong Chul Seo, Sang Woo Choi
Abstract: In carbon steel pipes of nuclear power plants, local wall thinning may result from erosion-corrosion or flow-accelerated corrosion(FAC) damage. Local wall thinning is one of the major causes for the structural fracture of these pipes. Therefore, assessment of local wall thinning due to corrosion is an important issue in nondestructive evaluation for the integrity of nuclear power plants. In this study, laser-generated ultrasound technique was employed to evaluate local wall thinning due to corrosion. Guided waves were generated in the thermoelastic regime using a Q-switched pulsed Nd:YAG laser with a linear slit array. . In this paper, time-frequency analysis of ultrasonic waveforms using wavelet transform allowed the identification of generated guided wave modes by comparison with the theoretical dispersion curves. Modes conversion and group velocity were employed to detect thickness reduction.
Authors: Miroslav Tomáš, Juraj Hudák, Dagmar Draganovská, Peter Ižol
Abstract: The contribution deals with verification of tin car body production using single action experimental stamping die. Two methods of car body production were verified - the first one used open die made of tool steel and the second one used closed die made of tool steel with Fibroflex at the bottom of the die. The tin steel sheet TS 245 with thickness 0.28 mm had been used for the car body production. The shapes of pressings were evaluated using the photogrammetric 3D measuring system ARGUS. The ARGUS optical system allowed evaluating the wall thickness change and the deformation on the surface of pressings as well. These values had been compared for both method of the tin car body production.
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