FEA-Based Ultrasonic Focusing Method in Anisotropic Media for Phased Array Systems
| Autor: | Kyung Mo Kim, Sung-Woo Kim, To Kang, Munsung Kim, Soonwoo Han, Seong-In Moon, Hyung-Ha Jin, Hyunil Seo |
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| Rok vydání: | 2021 |
| Předmět: |
Technology
austenitic welds Materials science QH301-705.5 Phased array QC1-999 Acoustics Physics::Medical Physics finite element analysis Welding Signal law.invention law Distortion General Materials Science Biology (General) Anisotropy QD1-999 Instrumentation ultrasonic wave Fluid Flow and Transfer Processes Physics Process Chemistry and Technology General Engineering Engineering (General). Civil engineering (General) Finite element method Computer Science Applications Chemistry Physics::Accelerator Physics phased array Ultrasonic sensor TA1-2040 Focus (optics) |
| Zdroj: | Applied Sciences Volume 11 Issue 19 Applied Sciences, Vol 11, Iss 8888, p 8888 (2021) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app11198888 |
| Popis: | Traditional ultrasonic imaging methods have a low accuracy in the localization of defects in austenitic welds because the anisotropy and inhomogeneity of the welds cause distortion of the ultrasonic wave propagation paths in anisotropic media. The distribution of the grain orientation in the welds influences the ultrasonic wave velocity and ultrasonic wave propagation paths. To overcome this issue, a finite element analysis (FEA)-based ultrasonic imaging methodology for austenitic welds is proposed in this study. The proposed ultrasonic imaging method uses a wave propagation database to synthetically focus the inter-element signal recorded with a phased array system using a delay-and-sum strategy. The wave propagation database was constructed using FEA considering the grain orientation distribution and the anisotropic elastic constants in the welds. The grain orientation was extracted from a macrograph obtained from a dissimilar metal weld specimen, after which the elastic constants were optimized using FEA with grain orientation information. FEA was performed to calculate a full matrix of time-domain signals for all combinations of the transmitting and receiving elements in the phased array system. The proposed approach was assessed for an FEA-based simulated model embedded in a defect. The simulation results proved that the newly proposed ultrasonic imaging method can be used for defect localization in austenitic welds. |
| Databáze: | OpenAIRE |
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