Magnetoelastic Measurements of Steel Stress under Uniaxial Loading


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An attempt has been made to measure existing steel stress using magnetoelasticity. A device has been developed and used for the measurement of magnetism in response to the deformation of a steel bar. The proposed technique can be used for the assessment of existing reinforced concrete structures by the measurements of steel stress embedded inside concrete. A traditional technique requires to break the existing steel bar to measure existing strain. However, the proposed technique is developed to measure the stress without damaging the steel bar. A successful application of magnetoelasticity depends on the establishment of relationship between elastic and magnetic response due to loading. To investigate the correlation between the two, steel bars are loaded in tension under uniaxial loading while the magnetic reading is recorded. Based on the test results, equations are suggested to predict stress for steel bars with different diameters.



Key Engineering Materials (Volumes 321-323)

Edited by:

Seung-Seok Lee, Joon Hyun Lee, Ik Keun Park, Sung-Jin Song, Man Yong Choi




H. C. Rhim et al., "Magnetoelastic Measurements of Steel Stress under Uniaxial Loading", Key Engineering Materials, Vols. 321-323, pp. 377-380, 2006

Online since:

October 2006




[1] E. Lacheisserie: Magnetostriction: Theory and Applications of Magnetoelasticity (CRC Press, 1993).

[2] J. Dapino: Magnetostrictive Materials - Their Use in Smart Structure Applications, Proceedings of US-Korea Workshop on Smart Infra-Structural Systems, pp.43-50, Busan, Korea (2002).

[3] A. Jarosevic: Magnetoelastic Method of Stress Measurement in Steel, Smart Structures (Kluwer Academic Publishers, 1999).


[4] M. Wang, G. Lloyd, and O. Hovorka: Development of a Remote Coil Magnetoelastic Stress Sensor for Steel Cables, Proceedings of SPIE 8 th Annual International Symposium on Smart Structures and Material, Health Monitoring and management of Civil Infrastructure Systems, Newport Beach CA, Vol. 4337, pp.122-128, (2001).


[5] R. Werner: Measurement of Force and Strain in Pre-Stressed Steel Bar in Reinforced Concrete using the Magnetoelastic Stray Field Method, International Symposium Non-Destructive Testing in Civil Engineering 2003(NDT-CE 2003), Berlin, Germany, (2003).

[6] H. Schoenekess, W. Ricken, and W. Becker: Influences of Magnetostriction and Magnetisation State on Strain and Force Measurement with Eddy-Current Sensors Applied to Steel Reinforced Concrete, International Symposium Non-Destructive Testing in Civil Engineering 2003, Berlin, Germany, (2003).