Magnetostrictive characterization of notches in steel pipes

Yichi Lu

doi:10.1117/12.339939

5 February 1999 Magnetostrictive characterization of notches in steel pipes

Yichi Lu

Proceedings Volume 3588, Nondestructive Evaluation of Utilities and Pipelines III; (1999) https://doi.org/10.1117/12.339939
Event: Nondestructive Evaluation Techniques for Aging Infrastructures and Manufacturing, 1999, Newport Beach, CA, United States

Abstract

The magnetostrictive sensor technique was used to generate and detect elastic guided waves in a steel pipe for ultrasonic pipe inspection. A notch with a fixed length but varied depths was made on the pipe to simulate a crack, and the reflection coefficients of the guided waves was used to characterize the notch depth. The group velocity of the guided wave propagating in the pipe measured by the magnetostrictive sensor was found to fit the calculated group velocity well. The frequency content of the guided waves in the pipe depends upon the center frequency of the electric pulse applied to the magnetostrictive sensor. For the center frequencies between 10 and 80 kHz, the reflection coefficient was found to have a minimal value when the notch area was 10 percent of the total cross-sectional area; but for the center frequencies between 100 and 200 kHz, the reflection coefficient was found to be a nearly linear function of the notch area.

Citation Download Citation

Yichi Lu "Magnetostrictive characterization of notches in steel pipes", Proc. SPIE 3588, Nondestructive Evaluation of Utilities and Pipelines III, (5 February 1999); https://doi.org/10.1117/12.339939

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