Transfer matrix of multilayered absorbing and anisotropic media. Measurements and simulations of ultrasonic wave propagation through composite materials

1993 ◽  
Vol 94 (3) ◽  
pp. 1488-1495 ◽  
Author(s):  
Bernard Hosten ◽  
Michel Castaings
Keyword(s):  
Wave Propagation ◽  
Composite Materials ◽  
Ultrasonic Wave ◽  
Transfer Matrix ◽  
Anisotropic Media ◽  
Ultrasonic Wave Propagation

scholarly journals FEA-Based Ultrasonic Focusing Method in Anisotropic Media for Phased Array Systems

2021 ◽  
Vol 11 (19) ◽  
pp. 8888
Author(s):  
Seongin Moon ◽  
To Kang ◽  
Soonwoo Han ◽  
Kyung-Mo Kim ◽  
Hyung-Ha Jin ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Ultrasonic Wave ◽  
Elastic Constants ◽  
Grain Orientation ◽  
Phased Array ◽  
Ultrasonic Imaging ◽  
Anisotropic Media ◽  
Imaging Method ◽  
Ultrasonic Wave Propagation ◽  
Propagation Paths

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.

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