Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode
A signal-processing algorithm for the detailed determination of delamination in multilayer structures is proposed in this work. The algorithm is based on calculating the phase velocity of the Lamb wave A<sub>0</sub> mode and estimating this velocity dispersion. Both simulation and experi...
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MDPI AG
2025-01-01
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| author | Olgirdas Tumšys Lina Draudvilienė Egidijus Žukauskas |
| author_facet | Olgirdas Tumšys Lina Draudvilienė Egidijus Žukauskas |
| author_sort | Olgirdas Tumšys |
| collection | DOAJ |
| description | A signal-processing algorithm for the detailed determination of delamination in multilayer structures is proposed in this work. The algorithm is based on calculating the phase velocity of the Lamb wave A<sub>0</sub> mode and estimating this velocity dispersion. Both simulation and experimental studies were conducted to validate the proposed technique. The delamination having a diameter of 81 mm on the segment of a wind turbine blade (WTB) was used for verification of the proposed technique. Four cases were used in the simulation study: defect-free, delamination between the first and second layers, delamination between the second and third layers, and defect (hole). The calculated phase velocity variation in the A<sub>0</sub> mode was used to determine the location and edge coordinates of the delaminations and defects. It has been found that in order to estimate the depth at which the delamination is, it is appropriate to calculate the phase velocity dispersion curves. The difference in the reconstructed phase velocity dispersion curves between the layers simulated at different depths is estimated to be about 60 m/s. The phase velocity values were compared with the delamination of the second and third layers and a hole drilled at the corresponding depth. The obtained simulation results confirmed that the drilled hole can be used as a defect corresponding to delamination. The WTB sample with a drilled hole of 81 mm was used in the experimental study. Using the proposed algorithm, detailed defect parameters were obtained. The results obtained using simulated and experimental signals indicated that the proposed new algorithm is suitable for the determination of delamination parameters in a multilayer structure. |
| format | Article |
| id | doaj-art-859b913eba314822a449553dd11f240c |
| institution | Kabale University |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| spelling | doaj-art-859b913eba314822a449553dd11f240c2025-01-24T13:49:16ZengMDPI AGSensors1424-82202025-01-0125253910.3390/s25020539Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave ModeOlgirdas Tumšys0Lina Draudvilienė1Egidijus Žukauskas2Ultrasound Research Institute, Kaunas University of Technology, LT-51423 Kaunas, LithuaniaUltrasound Research Institute, Kaunas University of Technology, LT-51423 Kaunas, LithuaniaUltrasound Research Institute, Kaunas University of Technology, LT-51423 Kaunas, LithuaniaA signal-processing algorithm for the detailed determination of delamination in multilayer structures is proposed in this work. The algorithm is based on calculating the phase velocity of the Lamb wave A<sub>0</sub> mode and estimating this velocity dispersion. Both simulation and experimental studies were conducted to validate the proposed technique. The delamination having a diameter of 81 mm on the segment of a wind turbine blade (WTB) was used for verification of the proposed technique. Four cases were used in the simulation study: defect-free, delamination between the first and second layers, delamination between the second and third layers, and defect (hole). The calculated phase velocity variation in the A<sub>0</sub> mode was used to determine the location and edge coordinates of the delaminations and defects. It has been found that in order to estimate the depth at which the delamination is, it is appropriate to calculate the phase velocity dispersion curves. The difference in the reconstructed phase velocity dispersion curves between the layers simulated at different depths is estimated to be about 60 m/s. The phase velocity values were compared with the delamination of the second and third layers and a hole drilled at the corresponding depth. The obtained simulation results confirmed that the drilled hole can be used as a defect corresponding to delamination. The WTB sample with a drilled hole of 81 mm was used in the experimental study. Using the proposed algorithm, detailed defect parameters were obtained. The results obtained using simulated and experimental signals indicated that the proposed new algorithm is suitable for the determination of delamination parameters in a multilayer structure.https://www.mdpi.com/1424-8220/25/2/539non-destructive testingLamb wavesdelamination parametrizationphase velocity dispersion curvefinite element modellingwind turbine blade |
| spellingShingle | Olgirdas Tumšys Lina Draudvilienė Egidijus Žukauskas Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode Sensors non-destructive testing Lamb waves delamination parametrization phase velocity dispersion curve finite element modelling wind turbine blade |
| title | Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode |
| title_full | Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode |
| title_fullStr | Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode |
| title_full_unstemmed | Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode |
| title_short | Detailed Determination of Delamination Parameters in a Multilayer Structure Using Asymmetric Lamb Wave Mode |
| title_sort | detailed determination of delamination parameters in a multilayer structure using asymmetric lamb wave mode |
| topic | non-destructive testing Lamb waves delamination parametrization phase velocity dispersion curve finite element modelling wind turbine blade |
| url | https://www.mdpi.com/1424-8220/25/2/539 |
| work_keys_str_mv | AT olgirdastumsys detaileddeterminationofdelaminationparametersinamultilayerstructureusingasymmetriclambwavemode AT linadraudviliene detaileddeterminationofdelaminationparametersinamultilayerstructureusingasymmetriclambwavemode AT egidijuszukauskas detaileddeterminationofdelaminationparametersinamultilayerstructureusingasymmetriclambwavemode |