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Related Concept Videos

Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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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...
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Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
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Shearing Stress01:19

Shearing Stress

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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
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Shearing Strain01:20

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by creating...
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When a beam is subjected to different loads, such as weight, pressure, or other external forces, internal forces are generated within the beam. These forces can have a significant impact on the overall stability and strength of the structure. Engineers use various methods to analyze and determine the magnitude and direction of these internal forces. One common technique used to determine internal forces in beams is the method of sections. This method involves considering an imaginary point or...
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Magnetic Resonance Elastography Methodology for the Evaluation of Tissue Engineered Construct Growth
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How to perform shear wave elastography. Part I.

Giovanna Ferraioli1, Richard G Barr2, André Farrokh3

  • 1Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, Medical School University of Pavia, Pavia, Italy.

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|May 4, 2021
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Summary
This summary is machine-generated.

This review covers shear wave elastography (SWE) principles and optimization. It details normal values and artifacts for liver, breast, thyroid, and salivary gland examinations using diagnostic ultrasound.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Diagnostic Ultrasound

Background:

  • Shear wave elastography (SWE) is an advanced ultrasound technique.
  • Accurate interpretation requires understanding its principles and optimization.

Purpose of the Study:

  • To review the principles, interpretation, and optimization of shear wave elastography (SWE).
  • To present normal values, pitfalls, and artifacts for SWE in specific organs.
  • To provide practical tips for integrating SWE into diagnostic ultrasound examinations.

Main Methods:

  • Review of existing literature and techniques related to SWE.
  • Description of principles governing SWE image generation and data acquisition.
  • Analysis of factors influencing SWE performance and image quality.

Main Results:

  • Detailed explanation of SWE principles and interpretation guidelines.
  • Presentation of established normal elasticity values for liver, breast, thyroid, and salivary glands.
  • Identification and illustration of common pitfalls and artifacts encountered during SWE examinations.

Conclusions:

  • SWE is a valuable tool for non-invasive tissue stiffness assessment.
  • Optimization and awareness of potential artifacts are crucial for reliable SWE results.
  • This review provides a comprehensive guide for the effective application of SWE in clinical practice.