Development of Hybrid Method between Finite Element Method and Geometrical Theory for Propagation Simulation of Ultrasonic Waves

概要

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In order to simulate wave propagation with small memory and high speed, a hybrid numerical method is developed in this paper, which combines geometrical theory and the finite element method. An approach based on reciprocal relation is used to calculate received signals using ultrasonic field and wave propagation calculated by geometrical theory and FEM, respectively. With the hybrid method, received signals from various side-drilled holes are predicated for normal and angle beam techniques. Predicted signals are compared with those by experiment and they are in good agreement with each other. Moreover, a side view of a specimen with complicated stress corrosion cracks is also calculated by the hybrid method, which is in good agreement with that computed by FEM. The number of nodes and computation time for this calculation by the hybrid method reduce to 1/3 and 1/10, respectively, compared with FEM.