Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> Mode
Air-coupled ultrasonic guided A<sub>0</sub> mode is already used for material characterization. By measuring the phase velocity of the A<sub>0</sub> mode the elastic properties, such as the Young’s modulus, can be determined. The objective of this work was the development of...
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MDPI AG
2020-05-01
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| Online Access: | https://www.mdpi.com/2076-3417/10/9/3299 |
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| author | Rymantas Jonas Kazys Liudas Mazeika Justina Sestoke |
| author_facet | Rymantas Jonas Kazys Liudas Mazeika Justina Sestoke |
| author_sort | Rymantas Jonas Kazys |
| collection | DOAJ |
| description | Air-coupled ultrasonic guided A<sub>0</sub> mode is already used for material characterization. By measuring the phase velocity of the A<sub>0</sub> mode the elastic properties, such as the Young’s modulus, can be determined. The objective of this work was the development of measurement methods and corresponding signal processing procedures enabling the acquisition of spatial distributions of non-uniform elastic properties of thin films and plates. Those methods are based on the excitation of a slow sub-sonic A<sub>0</sub> Lamb wave mode in a plate, the measurement of normal displacements at different distances from the source, the formation of the B-scan, and processing the collected signals. Two different signal processing methods were proposed and investigated. In the first method the all zero-crossing instants of the ultrasonic signals at different distances are found and from them spatial distributions of the A<sub>0</sub> mode velocity are determined. According to the second method 2D spatial-temporal spectrum of the B-scan is calculated and propagating A<sub>0</sub> modes with different velocities are identified. Efficiency of the proposed methods was evaluated theoretically and experimentally using thin mineral MICA paper samples, which is used in the electrical and aerospace industries as an insulating material. The zones with different A<sub>0</sub> mode phase velocities (95 ± ∆3 m/s and (106 ± ∆6 m/s) at the frequency 47 kHz were identified. |
| first_indexed | 2024-03-10T19:56:08Z |
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| id | doaj.art-1b94fa5683fc4e60b92633082ee5b1d9 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T19:56:08Z |
| publishDate | 2020-05-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj.art-1b94fa5683fc4e60b92633082ee5b1d92023-11-19T23:53:32ZengMDPI AGApplied Sciences2076-34172020-05-01109329910.3390/app10093299Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> ModeRymantas Jonas Kazys0Liudas Mazeika1Justina Sestoke2Prof. K. Barsauskas Ultrasound Research Institute, Kaunas University of Technology, 51423 Kaunas, LithuaniaProf. K. Barsauskas Ultrasound Research Institute, Kaunas University of Technology, 51423 Kaunas, LithuaniaProf. K. Barsauskas Ultrasound Research Institute, Kaunas University of Technology, 51423 Kaunas, LithuaniaAir-coupled ultrasonic guided A<sub>0</sub> mode is already used for material characterization. By measuring the phase velocity of the A<sub>0</sub> mode the elastic properties, such as the Young’s modulus, can be determined. The objective of this work was the development of measurement methods and corresponding signal processing procedures enabling the acquisition of spatial distributions of non-uniform elastic properties of thin films and plates. Those methods are based on the excitation of a slow sub-sonic A<sub>0</sub> Lamb wave mode in a plate, the measurement of normal displacements at different distances from the source, the formation of the B-scan, and processing the collected signals. Two different signal processing methods were proposed and investigated. In the first method the all zero-crossing instants of the ultrasonic signals at different distances are found and from them spatial distributions of the A<sub>0</sub> mode velocity are determined. According to the second method 2D spatial-temporal spectrum of the B-scan is calculated and propagating A<sub>0</sub> modes with different velocities are identified. Efficiency of the proposed methods was evaluated theoretically and experimentally using thin mineral MICA paper samples, which is used in the electrical and aerospace industries as an insulating material. The zones with different A<sub>0</sub> mode phase velocities (95 ± ∆3 m/s and (106 ± ∆6 m/s) at the frequency 47 kHz were identified.https://www.mdpi.com/2076-3417/10/9/3299air-coupled ultrasonicsultrasonic guided wavesLamb wavessub-sonic A<sub>0</sub> modemineral MICA papernon-destructive testing and evaluation |
| spellingShingle | Rymantas Jonas Kazys Liudas Mazeika Justina Sestoke Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> Mode Applied Sciences air-coupled ultrasonics ultrasonic guided waves Lamb waves sub-sonic A<sub>0</sub> mode mineral MICA paper non-destructive testing and evaluation |
| title | Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> Mode |
| title_full | Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> Mode |
| title_fullStr | Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> Mode |
| title_full_unstemmed | Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> Mode |
| title_short | Development of Ultrasonic Techniques for Measurement of Spatially Non-Uniform Elastic Properties of Thin Plates by Means of a Guided Sub-Sonic A<sub>0</sub> Mode |
| title_sort | development of ultrasonic techniques for measurement of spatially non uniform elastic properties of thin plates by means of a guided sub sonic a sub 0 sub mode |
| topic | air-coupled ultrasonics ultrasonic guided waves Lamb waves sub-sonic A<sub>0</sub> mode mineral MICA paper non-destructive testing and evaluation |
| url | https://www.mdpi.com/2076-3417/10/9/3299 |
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