Effect of Tensile Force on Magnetostrictive Sensors for Generating and Receiving Longitudinal Mode Guided Waves in Steel Wires

Abstract

When the longitudinal mode guided waves based on magnetostrictive effect were employed to inspect the bridge cables, we found that there was a large difference in the signal’s amplitude of the same specification cable under different tensile force. This difference would affect the test results and the identification of defects. It is necessary to study the effect of tensile force on the signal for the reliability of detection. Firstly, the effective field theory is employed to take the force as an additional bias magnetic field. Then, the effect of the tensile force on generating and receiving longitudinal mode guided waves based on magnetostrictive effect is obtained by the relationship between the bias magnetic field and the magnetostrictive coupling coefficient. Finally, the experiment of the magnetostrictive sensor is carried out on a Φ5 mm steel wire under different force. The experimental results are in good agreement with the theoretical results. The results show that the existence of the tensile force would change the operation point for generating and receiving the longitudinal mode guided waves based on magnetostrictive effect, which associated with the coupling coefficient. In order to obtain the optimal conversion efficiency for the force state wire and cable, the applied bias magnetic field should be set smaller than the bias magnetic field for the force-free state.

Magnetostriction Generator as Acoustic Wave Generator for Underwater Applications

“…Meanwhile, researches related to magnetostriction applications, such as: the use of magnetostriction effects in the field of civil structures [8], nickel as a magnetostrictive material for ultrasonic conditions [9], development of a magnetostrictive transducers for detection of blockages in the salt pipe fluids [10], magnetostrictive sensors for generating and receiving longitudinal mode guided waves on a steel wire [11], and magnetostrictive materials that can convert magnetic energy into mechanical energy or vice versa which are used in the actuators, transducers, sensors, and energy harvesters [12]. Previous researches on the generation of acoustic waves based on the magnetostriction, generally for applications in the air.…”

Excitation and Propagation of Longitudinal L (0, 2) Mode Ultrasonic Guided Waves for the Detection of Damages in Hexagonal Pipes: Numerical and Experimental Studies

“…Ultrasonic guided waves technique [4][5][6][7][8][9][10][11][12] has recently emerged as a highly efficient inspection approach for largescale structures. It shows significant potentials in NDE (nondestructive evaluation) and SHM (Structural Health Monitoring) for the inspection of structures in various fields, i.e., plates [13][14][15][16][17], pipelines [18][19][20][21][22][23][24][25], railways [26][27][28][29], and other structures [30][31][32][33][34]. Ultrasonic guided wave testing method enables a line-to-line inspection style, which makes it quite suitable for the inspection of large structures.…”