Abstract
Previous methods for modelling Rayleigh waves produced by a meander-line-coil electromagnetic acoustic transducer (EMAT) consisted mostly of two-dimensional (2D) simulations that focussed on the vertical plane of the material. This paper presents a pseudo-three-dimensional (3D) model that extends the simulation space to both vertical and horizontal planes. For the vertical plane, we combines analytical and finite-difference time-domain (FDTD) methods to model Rayleigh waves’ propagation within an aluminium plate and their scattering behaviours by cracks. For the horizontal surface plane, we employ an analytical method to investigate the radiation pattern of Rayleigh waves at various depths. The experimental results suggest that the models and the modelling techniques are valid.
Highlights
A wide group of non-destructive testing (NDT) techniques are commonly used in biomedical industries, such as ultrasonic techniques, electromagnetic techniques, and laser testing [1,2,3,4]
There are two major coupling principles for electromagnetic acoustic transducer (EMAT): magnetostriction is for ferromagnetic metallic materials, and the Lorentz force mechanism is for conductive and ferromagnetic materials [9]
finite-difference time-domain (FDTD); the 2D simulation on the vertical plane and experimental validations are introduced in Section is presented in Section 3 to investigate the radiation pattern of Rayleigh waves at various depths by
Summary
A wide group of non-destructive testing (NDT) techniques are commonly used in biomedical industries, such as ultrasonic techniques, electromagnetic techniques, and laser testing [1,2,3,4]. Lorentz force density obtained from the vertical plane of the sample is imported to the surface plane as the driving source to generate Rayleigh waves. This study lays a solid industrial foundation for neardetection using Rayleigh waves, and can be a starting point to build an advanced 3D EMAT model surface defects detection using Rayleigh waves, and can be a starting point to build an advanced 3D in the future. FDTD; the 2D simulation on the vertical plane and experimental validations are introduced in Section is presented in Section 3 to investigate the radiation pattern of Rayleigh waves at various depths by. 2. The pseudo-3D model is presented in Section 3 to investigate the radiation pattern of Rayleigh utilizing a wholly analytical solution.
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