Virtual nondestructive evaluation for anisotropic plates using Symmetry Informed Sequential Mapping of Anisotropic Green's function (SISMAG)

In this article, a generalized computational method to simulate virtual nondestructive evaluation (NDE) of anisotropic composite plates is presented. The ultrasonic wave fields were computed using a modified and generalized version of Distributed Point Source Method (DPSM), a semi-analytical mesh-free technique. The anisotropic Green's functions required for DPSM implementation were calculated using Fourier transform method and Radon transform method and compared. It is established that the Green's functions obtained from two different methods are identical. Applying generalized mathematical formulations, NDE of different degrees of anisotropic: transversely isotropic, orthotropic and monoclinic material are simulated and reported in this article. To boost the computational efficiency, a Symmetry Informed Sequential Mapping of Anisotropic Green's function (SISMAG) is introduced with DPSM and discussed in detail. To prove the above claims, virtual NDE experiments of anisotropic plates with normal and angle incidence of the ultrasonic wave are simulated using a circular transducer of central frequency ∼1 MHz. Wave fields inside both the fluid and the solid media were calculated.