Amorphous glass-coated microwires for applications as embedded stress sensors in functional materials

Calem, M.M.; Nematov, M.G.; Uddin, A.; Panina, L.V.; Morchenko, A.T.; Skidanov, V.A.

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Amorphous glass-coated microwires for applications as embedded stress sensors in functional materials

Authors

Date of publication

2016

Abstract

Contactless measurement of internal stress distribution in composite materials is of high importance in structural health monitoring. Considerable efforts are made to develop embedded stress-sensor approaches. In the present work, it is proposed to utilize soft-magnetic amorphous microwires with a stress-sensitive magnetization process as embedded sensors into a polymer matrix. The microwire of a diameter of 10-50 microns is covered by glass and is compatible with structural glass or carbon fibers. Because of an amorphous state, the main source of the anisotropy is the magnetostrictive interaction, so the wire magnetization processes may be highly sensitive to stress. When a bistable microwire is remagnetized a sharp voltage is induced which is characterized by high frequency harmonics. The amplitude of these harmonics sensitively depends on various stresses. This property can be used for stress monitoring inside composite materials.
In wires with axial anisotropy which is induced by the combination of positive magnetostriction and frozen-in internal tensile stress the remagnetization takes place by axial domain propagation, which generates a sharp voltage signal producing high harmonics. The harmonic amplitude depends on external parameters, such as stress, strain and temperature. Enhanced stress sensitivity is seen in the case when the magnetostriction constant can change a sign under stress effect as was demonstrated in the present paper. Therefore, these wires are perspective as wireless sensors with remote interrogation and can be placed on the surface or inside materials. We demonstrate that the ratio of harmonic amplitude may also sensitively depend on tensile and torsion stress which can be used directly for structural health monitoring.

Keywords

ferromagnetic microwires, magnetostriction, magnetoimpedance, magnetic bistability, embedded sensors

Library reference

Calem M.M., Nematov M.G., Uddin A., Panina L.V., Morchenko A.T., Skidanov V.A. Amorphous glass-coated microwires for applications as embedded stress sensors in functional materials // Problems of Perspective Micro- and Nanoelectronic Systems Development - 2016. Proceedings / edited by A. Stempkovsky, Moscow, IPPM RAS, 2016. Part 4. P. 207-214.

URL of paper

http://www.mes-conference.ru/data/year2016/pdf/D135.pdf