Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 7: 34 - 41

DOI: https://doi.org/10.12141/j.issn.1000-565X.220322

Mechanical Engineering

Experimental Investigation into Internal Stress Detection of Aluminum Alloy by Phased Array Longitudinal-Wave Ultrasonic Testing

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  • 1.Provincial Key Laboratory of Advanced Manufacturing Technology for Marine Energy Equipment，Guangdong University of Technology，Guangzhou 510006，Guangdong，China
    2.International School of Microelectronics，Dongguan University of Technology，Dongguan 523808，Guangdong，China
    3.School of Mechanical Engineering，Dongguan University of Technology，Dongguan 523808，Guangdong，China
邹大鹏（1977-），男，博士，教授，主要从事工程测试、声学探测等研究。

Received date: 2022-05-31

  Online published: 2023-02-06

Supported by

the Special Fund Project for the Development of the Marine Economy （Six Major Marine Industries） in Guangdong Province(GDNRC［2023］028);the Key Project of Regional Joint Fund of Guangdong Provincial Basic and Applied Basic Research Fund(2020B1515120095);the Special Projects in Key Fields of Ordinary Universities in Guangdong Province(2020ZDZX2016)

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Abstract

Aluminum alloy materials are widely used in the fields such as aerospace, automotive manufacturing and shipbuilding. However, the load stress and residual stress during the manufacturing and equipment process directly affect the mechanical properties and fatigue life of aluminum alloy components. In this paper, for the purpose of evaluating the internal stress of aluminum alloy and on the basis of acoustic elasticity principle, the phased array longitudinal-wave detection technology was studied, and an internal stress detection method of aluminum alloy was set up based on the time difference during longitudinal wave propagation. Then, an experimental system for phased array longitudinal-wave ultrasonic stress detection was set up, and calibration experiments were carried out to reveal the linear relationship between the internal stress of aluminum alloy and the time difference during longitudinal wave propagation, with the correlation equations being also formulated. The results show that, within the tensile stress range of 0~286 MPa, the absolute calibration errors of 5 mm and 3 mm aluminum alloy plates are respectively less than 2.85 MPa and 10.82 MPa, the corresponding relative errors are respectively not more than 2.36% and 13.93%, and the maximum relative errors of both specifications occur within the stress range of less than 28.58 MPa, meaning that it is necessary to improve the resolution and accuracy of ultrasonic measurement in small stress detection. The phased array longitudinal-wave system was then used to detect the stress 5 mm aluminum alloy plate specimens, and an average stress error of (1.174±4.567) MPa, an absolute error of less than 9.42 MPa as well as an estimated initial residual stress of 3.329 MPa was obtained. The experimental results show that the proposed phased array longitudinal-wave ultrasonic method is effective in detecting the average stress of 5 mm aluminum alloy plate; that the method based on the time difference during longitudinal wave propagation can be used to detect the stress type, stress size and residual stress; and that the proposed method is effective in improving the detection accuracy and efficiency of the internal stress detection of aluminum alloy.

Key words： aluminum alloy; phased array longitudinal-wave detection; internal stress; acoustic time difference

Cite this article

ZOU Dapeng, ZENG Xinfa, REN Bin, et al. . Experimental Investigation into Internal Stress Detection of Aluminum Alloy by Phased Array Longitudinal-Wave Ultrasonic Testing[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(7) : 34 -41 . DOI: 10.12141/j.issn.1000-565X.220322

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