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Ultrasonic Water Immersion Nondestructive Testing for Nylon Bars Based on a Multi-Gaussian Beam Model

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Abstract

Nylon is a common engineering plastic that is easy to machine and can serve as a mechanical end-part. Ultrasonic testing is a highly efficient nondestructive testing method for the inspection of nylon materials. However, the curvature of the surface causes scattering or focusing of the ultrasonic beam bring difficulties to detect the inner defects. In addition, some configuration parameters, such as the water path depth, also affect the acoustic field distribution. It is necessary to predict the acoustic field distribution to achieve a better testing accuracy. An acoustic field simulation model based on a multi-Gaussian beam is established to predict the focused acoustic field in a multilayer medium under a curved interface. The relationship between the acoustic focusing area and the water path depth was explored, and the water path depth is selected by simulating the effective detection region. C-scan imaging of specimens with artificial flat-bottom holes are performed at different water path depths. By comparing the quantitative analysis results of different water path depths, the error of the FBH size obtained by selecting a water path depth is significantly less than others. The ultrasonic C-scan images of nylon bar with natural flaws are compared with the microscopic CT tomography reconstruction images, and the comparison shows that the defects can be detected in the C-scan images. The results show that the proposed method can optimize the configuration parameters to improve the accuracy of the flaw sizing. This study provides an efficient technique for the detection of nylon bars.

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Acknowledgements

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Funding

This work is supported by the National Natural Science Foundation of China (Grant Nos. 51705418 and 52175518), the Shannxi Coal Joint fund of Natural Science Basic Research Program of Shaanxi (Grant No. 2021JLM-07), and the Natural Science Basic Research Program of Shaanxi (Grant Nos. 2019JQ-801 and 2019JM-024).

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Authors and Affiliations

  1. School of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Ming Dong, Hui Tian, Hong-wei Ma, Xiang Wan & Xian-gang Cao

  2. Shaanxi Key Laboratory of Mine Electromechanical Equipment Intelligent Detection and Control, Xi’an, 710054, China

    Ming Dong, Hong-wei Ma, Xiang Wan, Yuan Chen & Xian-gang Cao

  3. Xi’an Intelligent Remanufacturing Research Institute Co., Ltd, Xi’an, 710018, China

    Xin Wang

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  1. Ming Dong
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  5. Yuan Chen
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  7. Xin Wang
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Contributions

MD, H-wM and YC conceived and designed the experiments; HT and XW performed the experimental test. X-gC analyzed the data; HT, MD and XW wrote the paper. All authors reviewed the manuscript.

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Correspondence to Ming Dong.

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Dong, M., Tian, H., Ma, Hw. et al. Ultrasonic Water Immersion Nondestructive Testing for Nylon Bars Based on a Multi-Gaussian Beam Model. J Nondestruct Eval 42, 53 (2023). https://doi.org/10.1007/s10921-023-00964-8

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