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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.6K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.6K
Stress-Strain Diagram01:10

Stress-Strain Diagram

3.4K
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
3.4K
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

641
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
641
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

9.1K
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
9.1K
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

527
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...
527
True Stress and True Strain01:28

True Stress and True Strain

871
Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
871

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Production of a Strain-Measuring Device with an Improved 3D Printer
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Strain Elastography - How To Do It?

Christoph F Dietrich1, Richard G Barr2, André Farrokh3

  • 1Caritas-Krankenhaus, Innere Medizin 2, Bad Mergentheim, Germany.

Ultrasound International Open
|December 12, 2017
PubMed
Summary
This summary is machine-generated.

Ultrasound elastography visualizes tissue stiffness, aiding pathology diagnosis. This review details strain and shear wave elastography principles, techniques, and interpretation for clinical use.

Keywords:
endoscopic ultrasoundreal-timetissue elastography (TE)ultrasound

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Diagnostic Techniques

Background:

  • Palpation has historically assessed tissue stiffness for pathology diagnosis.
  • Ultrasound elastography offers advanced imaging of tissue stiffness.
  • Two primary methods exist: strain and shear wave elastography.

Purpose of the Study:

  • To review the principles, techniques, and interpretation of ultrasound elastography.
  • To compare qualitative (strain) and quantitative (shear wave) elastography methods.
  • To guide optimization and discuss pitfalls in clinical application.

Main Methods:

  • Review of ultrasound elastography principles.
  • Description of strain elastography (qualitative).
  • Description of shear wave elastography (quantitative).

Main Results:

  • Strain elastography provides relative tissue stiffness information.
  • Shear wave elastography quantifies stiffness (m/s or kPa).
  • Both methods have complementary advantages and disadvantages.

Conclusions:

  • Ultrasound elastography is a valuable tool for assessing tissue stiffness.
  • Understanding technique and interpretation is crucial for accurate diagnosis.
  • Strain elastography is a key focus of this review for various organs.