Recent research by the authors has revealed the presence of shear horizontal-type of feature-guided (SH B ) waves in plates with 90° transverse bends. The SH B mode is non-dispersive and has low attenuation over a range of higher frequencies (500 kHz - 1 MHz). This mode is attractive for Non-destructive Evaluation (NDE) of bends in practical structures such as aerospace spar joints. Here the interaction of the SH B mode with transverse small-width notches (cracks) running across bends in plates is studied using 3D finite element simulations and validated by experiments. For through-thickness cracks, the influence of transverse crack length on SH B mode reflection is studied. For part-depth but long cracks (transverse length greater than operating wavelength), influence of crack depth on mode reflection is studied. The results demonstrate the potential of the SH B mode for NDE of bent plate structures.
Manogharan, P., Yu, X., Fan, Z., & Rajagopal, P. (2015). Interaction of the shear horizontal bend guided mode (SHB) with transverse cracks. In Physics Procedia (Vol. 70, pp. 656–659). Elsevier. https://doi.org/10.1016/j.phpro.2015.08.069