Abstract
Steel structures are widely used in railway infrastructures. Their stress state is the most important determinant of the safety of these structures. The elasto-magnetic (EM) sensor is the most promising for stress monitoring of in-service steel structures. Nevertheless, the necessity of magnetic excitation to saturation due to the use of a secondary coil for signal detection, keeps from its engineering application. In this paper, a smart elasto-magneto-electric (EME) sensor using magneto-electric (ME) sensing units to take the place of the secondary coil has been exploited for the first time. The ME sensing unit is made of ME laminated composites, which has an ultrahigh ME voltage coefficient and can measure the magnetic induction simply and precisely. Theoretical analysis and characterization experiments firstly conducted on the ME laminated composites showed that the ME sensing units can be applied in the EM sensor for improved performance in stress monitoring. A tension test of a steel bar was carried out to characterize our smart EME sensor and the results showed high accuracy and sensitivity. The present smart EME sensor is a promising tool for stress monitoring of steel structures in railway and other civil infrastructures.
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Project supported by the National Natural Science Foundation of China (Nos. 50908202, 51178426, 90915008, and 60801011), the Zhejiang Provincial Natural Science Foundation, China (No. Y1090382), the Fok Ying-Tong Education Foundation for Young Teachers in the Higher Education Institutions of China (No. 122012), and the Key Science and Technology Innovation Team Program of Zhejiang Province, China (No. 2010R50034)
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Duan, Yf., Zhang, R., Zhao, Y. et al. Smart elasto-magneto-electric (EME) sensors for stress monitoring of steel structures in railway infrastructures. J. Zhejiang Univ. Sci. A 12, 895–901 (2011). https://doi.org/10.1631/jzus.A11GT007
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DOI: https://doi.org/10.1631/jzus.A11GT007
Key words
- Stress monitoring
- High-speed railway
- Steel rail
- Elasto-magnetic (EM) sensor
- Magneto-electric (ME)
- Elasto-magneto-electric (EME) sensor