Elastic waves in helical waveguides

Experimental observation of topologically protected helical edge modes in Kagome elastic plates

The investigation of topologically protected waves in classical media has opened unique opportunities to achieve exotic properties like oneway phonon transport, protection from backscattering and immunity to imperfections. Contrary to acoustic and electromagnetic domains, their observation in elastic solids has so far been elusive due to the presence of both shear and longitudinal modes and the...

Mechanics of 2D Elastic Stress Waves Propagation Impacted by Concentrated Point Source Disturbance in Composite Material Bars

Green’s function, an analytical approach in inhomogeneous linear differential equations, is the impulse response, which is applied for deriving the wave equation solution in composite materials mediums. This paper investigates the study of SH wave’s transmission influenced by concentrated point source disturbance in piezomagnetic material resting over heterogeneous half-space. Green function ap...

Numerical interaction of boundary waves with perfectly matched layers in elastic waveguides

Perfectly matched layers (PML) are a novel technique to simulate the absorption of waves in open domains. Wave propagation in isotropic elastic waveguides has the possibility to support propagating modes with negative group velocities and long wavelengths. Propagating modes with negative group velocities can lead to temporally growing solutions in the PML. In this paper, we demonstrate that neg...

Computation of modes in embedded helical structures with the SAFE-PML method

Helical multi-wire cables are widely used in bridge construction and can be degraded due to corrosion and fatigue. To reveal defects inside cable structures, elastic guided waves are of interest owing to their ability to propagate over long distances. In practice, cables are often buried into a solid matrix and can be considered as open waveguides. Waves can be leaky and strongly attenuate alon...

Nonlinear waves and wave scattering in layered elastic waveguides