Related Experiment Video
Updated: Oct 28, 2025
04:39
Measurement of Chladni Mode Shapes with an Optical Lever Method
Published on: June 5, 2020
5.3K
Coupled Scholte modes supported by soft elastic plates in water
B M Staples1, T J Graham1, A P Hibbins1
1University of Exeter, Exeter EX4 4QL, United Kingdom.
Physical Review. E
|July 17, 2021
Summary
Researchers explored acoustic surface waves on soft elastic plates in water. They found Scholte waves on soft interfaces travel slower than sound in water, with energy spreading beyond the water.
Area of Science:
- Acoustics
- Materials Science
- Solid Mechanics
Background:
- Localized acoustic surface waves, such as Scholte waves, propagate at the interface between a solid and a fluid.
- Understanding wave behavior in soft materials is crucial for various applications.
Purpose of the Study:
- To investigate localized acoustic surface waves on soft elastic plates submerged in water.
- To characterize the properties and behavior of Scholte waves at soft interfaces.
Main Methods:
- Theoretical exploration of acoustic surface waves on soft elastic plates.
- Experimental verification using acrylic plates underwater.
Main Results:
- Scholte wave velocity on soft interfaces is significantly lower than the speed of sound in water.
- Energy of Scholte waves on soft interfaces is not primarily confined to the water.
- The ratio of Young's modulus to density, not bulk sound speeds, indicates a soft interface.
- Symmetric coupled Scholte modes on thin soft plates exhibit dispersive behavior at low frequencies.
Conclusions:
- Soft elastic interfaces support unique acoustic surface wave phenomena.
- The dispersive behavior of coupled Scholte modes at low frequencies is a key characteristic of soft interfaces.
More Related Videos
Related Concept Videos
01:04Modes of Standing Waves: II
1.1K
The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
1.1K
01:20Elastic Strain Energy for Shearing Stresses
334
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
334
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
376
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
376
01:03Modes of Standing Waves - I
3.2K
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
3.2K
01:28Standing Waves in a Cavity
1.1K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.1K
01:24Circular Shafts - Elastoplastic Materials
243
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
As torque on the...
243