Publication

The role of Rayleigh Waves in Granular Solids

Alessandro Spadoni, Bart Van Damme
2013
Conference Papers

Abstract

Wave propagation in granular solids is found to have at least two regimes: a low-frequency ballistic signal and a high-frequency diffusive tail. The latter is attributed to granules clapping or elastic waves within the granules themselves. The low frequency front is traditionally attributed to the rigid-body motion of particles and their interactions via quasi-static contact forces. We present results obtained with experimental and numerical models indicating that the low-frequency ballistic wavefront is itself the result of surface waves in the granules. We find surface waves to be the principal mechanism of energy transmission.

Official source

https://infoscience.epfl.ch/entities/publication/56469d36-5a3e-47ce-814e-c17eda925c56

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Alessandro Spadoni, Bart Van Damme
2013
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/56469d36-5a3e-47ce-814e-c17eda925c56

About this result

Related concepts (32)

Seismic wave

A seismic wave is a mechanical wave of acoustic energy that travels through the Earth or another planetary body. It can result from an earthquake (or generally, a quake), volcanic eruption, magma movement, a large landslide, and a large man-made explosion that produces low-frequency acoustic energy. Seismic waves are studied by seismologists, who record the waves using seismometers, hydrophones (in water), or accelerometers.

Rayleigh wave

Rayleigh waves are a type of surface acoustic wave that travel along the surface of solids. They can be produced in materials in many ways, such as by a localized impact or by piezo-electric transduction, and are frequently used in non-destructive testing for detecting defects. Rayleigh waves are part of the seismic waves that are produced on the Earth by earthquakes. When guided in layers they are referred to as Lamb waves, Rayleigh–Lamb waves, or generalized Rayleigh waves.

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In physics, a surface wave is a mechanical wave that propagates along the interface between differing media. A common example is gravity waves along the surface of liquids, such as ocean waves. Gravity waves can also occur within liquids, at the interface between two fluids with different densities. Elastic surface waves can travel along the surface of solids, such as Rayleigh or Love waves. Electromagnetic waves can also propagate as "surface waves" in that they can be guided along with a refractive index gradient or along an interface between two media having different dielectric constants.

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