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A Method for Detection of Internal Defects of Dielectric Materials Based on Pulsed Electro-Acoustic Technique

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Abstract

Background

Several methods have been used to detect defects or debonds nondestructively in materials or construction. Each of these nondestructive testing methods has advantages and limitations. Generally, they are suitable for testing a certain range or a specific type of material and structure and some of them require careful analysis to identify the features of the defects.

Objective

The present work proposes a nondestructive testing method based on electro-acoustic technique (NDTPEA) to detect internal defects of dielectric materials, which can identify the defects from the original stress wave generated at the internal defect surface.

Methods

Electric polarization occurs in the dielectric under the action of a high-voltage electric field. When the intensity of the electric field changes suddenly, the polarization charge generates a stress wave. If there are defects, such as cracks and debonding, in the medium, the position and size of the internal defects of the insulating material can be determined according to the stress wave.

Results

The waveform and velocity of stress wave is measured by a PVDF film. According to the velocity and time of the stress wave in the dielectric, the position of the internal defects or debonding of the specimen can be determined. The maximum error for measuring the wave transmission time is 1 ns, and the maximum measurement error in the defect thickness direction was 0.00253 mm.

Conclusions

In the NDTPEA, the detected wave originates from the vibration of the polarized charge at the defect, i.e., the defect is the source of the stress wave. The measured stress wave does not undergo any reflection or refraction, and the waveform is truly regular, without coupling factors. The wave shape and time characteristics can all reflect the characteristics of the defects.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under grant 11672350.

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Authors and Affiliations

  1. School of Mechanical Engineering, Tianjin University, Tianjin, 300072, China

    L. Xu, Z. Hou & H. Kang

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  1. L. Xu
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  2. Z. Hou
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  3. H. Kang
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Correspondence to Z. Hou.

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Xu, L., Hou, Z. & Kang, H. A Method for Detection of Internal Defects of Dielectric Materials Based on Pulsed Electro-Acoustic Technique. Exp Mech 62, 417–426 (2022). https://doi.org/10.1007/s11340-021-00793-8

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