Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

In the previous study, we have shown the consistency between the spectral characteristics of magnetoacoustic emission (MAE) and the effects of uniaxial stress, with an AC magnetic field applied parallel to the stress axis [1,2]. This is based on the following facts; first, the main contribution to MAE generation is due to the motion of 90° domain walls and, second, the uniaxial stress controls the area of 90° domain walls through the domain alignment [3]. The area of 90° domain walls decreases monotonically upon the application of tensile stress. At the initial stage of applying uniaxial compression, however, the area of 90° domain walls, contributing to the MAE generation, increases up to certain level of compressive stress and begins to decrease beyond that point. The amplitude of MAE burst was seen to follow the above-stated uniaxial stress effects on the area of 90° domain walls. More specifically, the MAE amplitude increased upon the application of compressive stress and reached its maximum in a range between −50 to −75 MPa.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 7: Characterization of Materials

Section

Acoustoelasticity, Stress and Texture

Pages

1959-1965

DOI

10.1007/978-1-4615-3742-7_107

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Effects of Uniaxial Stress on Magnetoacoustic Emission Spectra of Steel

La Jolla, CA

In the previous study, we have shown the consistency between the spectral characteristics of magnetoacoustic emission (MAE) and the effects of uniaxial stress, with an AC magnetic field applied parallel to the stress axis [1,2]. This is based on the following facts; first, the main contribution to MAE generation is due to the motion of 90° domain walls and, second, the uniaxial stress controls the area of 90° domain walls through the domain alignment [3]. The area of 90° domain walls decreases monotonically upon the application of tensile stress. At the initial stage of applying uniaxial compression, however, the area of 90° domain walls, contributing to the MAE generation, increases up to certain level of compressive stress and begins to decrease beyond that point. The amplitude of MAE burst was seen to follow the above-stated uniaxial stress effects on the area of 90° domain walls. More specifically, the MAE amplitude increased upon the application of compressive stress and reached its maximum in a range between −50 to −75 MPa.