Damage diagnostics of metallic structures using magneto-mechanical impedance technique

Andrei Zagrai; Hakan Çakan

doi:10.1117/12.774361

10 April 2008 Damage diagnostics of metallic structures using magneto-mechanical impedance technique

Andrei Zagrai, Hakan Çakan

Author Affiliations +

Proceedings Volume 6935, Health Monitoring of Structural and Biological Systems 2008; 69350J (2008) https://doi.org/10.1117/12.774361
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

The paper discusses application of a Magneto-Mechanical Impedance (MMI) technique for damage diagnostics in metallic structures. A magneto-elastic active sensor consisting of a coil and a permanent magnet is utilized for generation of elastic waves via the eddy current mechanism. The generated waves travel in the host structure and reflect off boundaries producing standing (modal) spatial patterns at respective resonance frequencies. Frequency dependent response to the applied excitation is obtained by the same sensor and is presented in terms of the dynamic impedance. It is shown that the impedance measured in the MMI technique reflects structural dynamic characteristics. Experimental studies involving simple and complex structural elements are presented that explore MMI spectral features for damage diagnostics. Comparison of the impedance data reveals shift and redistribution of impedance peaks in the MMI spectra associated with the damaged samples. We conclude that MMI technique can be employed for structural diagnostics in the embedded SHM or re-configurable NDE formats.

Citation Download Citation

Andrei Zagrai and Hakan Çakan "Damage diagnostics of metallic structures using magneto-mechanical impedance technique", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 69350J (10 April 2008); https://doi.org/10.1117/12.774361

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