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Published on: August 5, 2020
A Lorentz force-based SH-typed electromagnetic acoustic transducer using flexible circumferential printed circuit
Xiaodong Sui1, Ru Zhang1, Yaozhi Luo2
1Department of Civil Engineering, Hangzhou City University, China; College of Civil Engineering and Architecture, Zhejiang University, China; Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province, Hangzhou City University, China.
A new flexible circumferential printed circuit electromagnetic acoustic transducer (EMAT) generates omnidirectional shear horizontal waves for structural health monitoring. This CPC-EMAT offers a simpler, more effective alternative to existing methods for damage detection in structures.
Area of Science:
- Materials Science
- Mechanical Engineering
- Nondestructive Testing
Background:
- Structural health monitoring (SHM) is crucial for in-service structures.
- Shear horizontal (SH0) guided waves are ideal for damage detection due to their properties.
- Existing electromagnetic acoustic transducers (EMATs) for SH0 waves have limitations.
Purpose of the Study:
- To develop a practical and efficient EMAT for generating omnidirectional SH0 waves.
- To introduce a novel flexible circumferential printed circuit (CPC) design for EMATs.
- To compare the proposed CPC-EMAT with traditional circumferential magnet array (CMA)-based EMATs.
Main Methods:
- Finite element simulations were used to analyze CMA-EMAT performance with varying magnet configurations.
- A CPC design was proposed and optimized for size to replace the CMA.
- Experimental tests were conducted to validate the CPC-EMAT's properties.
Main Results:
- The CPC-EMAT demonstrates simpler fabrication compared to CMA-EMAT.
- Simulation and experimental results confirm the generation of desirable omnidirectional SH0 waves.
- The CPC-EMAT provides acceptable performance for SH0 wave generation.
Conclusions:
- The developed CPC-EMAT is a practical and effective transducer for SH0 guided waves.
- The CPC-EMAT offers advantages in ease of fabrication and performance.
- This transducer is expected to be widely used in SH-guided wave-based SHM systems.
