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Title: Steel stress monitoring sensor based on elasto-magnetic effect and using magneto-electric laminated composite
Authors: Duan, Y
Zhang, R
Zhao, Y
Or, DSW 
Fan, KQ
Tang, ZF
Keywords: Bars
Composite materials
Dysprosium alloys
Iron alloys
Lead compounds
Magnetic sensors
Magnetoelectric effects
Magnetostrictive devices
Piezoelectric devices
Stress measurement
Terbium alloys
Issue Date: 1-Apr-2012
Publisher: American Institute of Physics
Source: Journal of applied physics, 1 Apr. 2012, v. 111, no. 7, 07E516, p. 1-3 How to cite?
Journal: Journal of applied physics 
Abstract: Monitoring of stresses in in-service steel structural components is challenging, but crucial to structural safety and health evaluation. Elasto-magnetic (EM) sensors are promising for stress monitoring of steel structural components, because of their great capabilities for actual stress measurement, noncontact monitoring, and long service life. However, the low sensitivity, low signal-to-noise ratio, slow response, and complicated installation of the EM sensors limit their application flexibility. This paper presents a steel stress monitoring sensor (SSMS) using a magneto-electric (ME) sensing unit to overcome the drawbacks intrinsic in the conventional EM sensors. The ME sensing unit is made of a ME-laminated composite of Terfenol-D magnetostrictive alloy and 0.7Pb_Mg1/3Nb2/3_O3−0.3PbTiO3 (PMN-PT) piezoelectric crystal. The theoretical analysis and experimental characterization conducted on the ME sensing unit show high sensitivity, real-time response, and good linearity. Stress monitoring of a steel bar under tension is implemented for the SSMS with a pulse excitation of magnetization. The results demonstrate that the SSMS is feasible for real-time stress monitoring of steel structural components with high sensitivity, fast response, and ease of installation.
ISSN: 0021-8979 (print)
1089-7550 (online)
DOI: 10.1063/1.3679420
Rights: © 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Yuan-Feng Duan et al., J. Appl. Phys. 111, 07E516 (2012) and may be found at
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