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Modeling Magnetostrictive Transducers for Structural Health Monitoring: Ultrasonic Guided Wave Generation and

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Magnetostrictive transducers (MSTs) offer flexible generation and reception of ultrasonic guided waves for structural health monitoring. Simulations show MSTs can selectively excite specific wave modes, crucial for advanced material degradation detection in plates.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nondestructive Testing

Background:

  • Ultrasonic guided waves are vital for structural health monitoring (SHM) of plate-like structures.
  • Magnetostrictive transducers (MSTs) can generate and receive both shear-horizontal (SH) and Lamb waves, but their characteristics require further study compared to piezoelectric transducers.

Purpose of the Study:

  • Investigate MST characteristics influencing guided wave generation and reception.
  • Explore MST flexibility for diverse guided wave applications in SHM.
  • Compare single-sided and double-sided MSTs for preferential wave mode generation.

Main Methods:

  • Conducted multiphysics simulations of the MST/plate system.
  • Analyzed MST component characteristics: magnetostrictive layer, meander electric coil, and biased magnetic field.
  • Investigated wave mode control via meander coil spacing for phase velocity dispersion curves.

Main Results:

  • Double-sided MSTs with in-phase signals preferentially excite symmetric SH and Lamb modes.
  • Double-sided MSTs with out-of-phase signals preferentially excite antisymmetric SH and Lamb modes.
  • Achieved successful single-mode actuations with double-sided MSTs, including SH3 mode at 922 kHz in a 6-mm plate.

Conclusions:

  • MSTs provide tunable control over guided wave mode generation.
  • Increasing meander coil turns enhances MST receiver sensitivity and reduces frequency bandwidth.
  • MSTs demonstrate significant potential for advanced SHM applications through controlled guided wave excitation.