Shear Wave Propagation
Shear Wave Propagation - Related Videos
01:07
Propagation of Waves
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2023
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free. Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
01:30
Propagation Speed of Electromagnetic Waves
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2023
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as: Consider a plane wavefront traveling in the positive x-direction as shown in figure. Over it, consider a rectangle in the xz-plane, with an area vector in the positive y-direction. The integration is performed counterclockwise around the rectangle to solve the left-hand side of Ampere's law. The magnetic field is either zero or perpendicular to the length elements except...
10:46
Mechanical Stimulation-induced Calcium Wave Propagation in Cell Monolayers: The Example of Bovine Corneal Endothelial Cells
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Cited by 25 •
2013
Intercellular Ca2+-waves are driven by gap junction channels and hemichannels. Here, we describe a method to measure intercellular Ca2+-waves in cell monolayers in response to a local single-cell mechanical stimulus and its application to investigate the properties and regulation of gap junction channels and hemichannels.
02:12
The Wave Nature of Light
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2020
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion. Others in the...
09:32
Standing Waves
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2023
Source: Arianna Brown, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA Standing waves, or stationary waves, are waves that appear not to propagate and are produced by the interference of two waves traveling in opposite directions with the same frequency and amplitude. These waves appear to vibrate up and down with no linear movement and are most easily identified in vibrating finite media like a plucked guitar string,...
FAQs
Wave speed and attenuation provide complementary mechanical information. Speed reflects how readily a material transmits deformation, whereas attenuation describes how the disturbance weakens as it travels. In soft tissues and biomaterials, interpreting both measurements is important because stiffness, viscosity, density, and structural organization can influence the observed signal in different ways.
The applied force matters because tangential deformation supplies the mechanical disturbance that initiates the wave. Once generated, particle motion remains perpendicular to the travel direction, allowing the resulting behavior to be related to the material’s resistance to deformation. This relationship helps bioengineers connect measured wave behavior with tissue or biomaterial mechanics.
Changes in wave behavior can indicate altered tissue mechanics because disease or treatment may modify properties that govern transmission and attenuation. Monitoring these changes gives bioengineers a way to assess tissue integrity and function over time. The measurement therefore provides mechanical context that complements direct observation of disease-related or treatment-related change.
A basic measurement workflow begins by applying a force to tissue or a biomaterial, observing how the resulting disturbance travels, and evaluating its speed and attenuation. Those measurements are then interpreted in relation to stiffness, viscosity, density, and structural organization. Because the approach can characterize mechanics without extensive disruption, it supports assessment while preserving the tested material.
In elastography, shear wave measurements serve as a mechanical readout rather than a purely structural image. Bioengineers can use the resulting information to characterize tissue mechanics and monitor changes associated with disease or treatment. The value of the method lies in tracking altered mechanical behavior, which may reveal changes in tissue integrity or function without extensive disruption.
For engineered materials, propagation results help evaluate whether a material exhibits the mechanical behavior required for its intended role. Comparing wave speed and attenuation across biomaterial designs can expose differences linked to stiffness, viscosity, density, or organization. This makes the technique useful not only for characterization after fabrication, but also for guiding biomaterial design and refinement.