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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

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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...
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Elastic Strain Energy for Shearing Stresses01:20

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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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Shearing Strain01:20

Shearing Strain

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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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Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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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...
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Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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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...
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Contributed Review: Distributed optical fibre dynamic strain sensing.

Ali Masoudi1, Trevor P Newson1

  • 1Optoelectronics Research Centre, University of Southampton, Hampshire SO17 1BJ, United Kingdom.

The Review of Scientific Instruments
|February 1, 2016
PubMed
Summary
This summary is machine-generated.

This review covers distributed optical fiber sensors for dynamic vibrations. Rayleigh-based sensors offer longer range and higher frequency, while Brillouin-based sensors provide better spatial resolution for dynamic strain and sound wave detection.

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Area of Science:

  • Optoelectronics
  • Sensing Technology
  • Fiber Optics

Background:

  • Distributed optical fiber sensors for static/quasi-static measurements (temperature, strain) are commercialized.
  • Recent research focuses on dynamic phenomena like dynamic strain and sound waves.

Purpose of the Study:

  • To review the state-of-the-art distributed optical fiber sensors for quantifying dynamic vibrations.
  • To analyze sensing techniques and scattering processes for dynamic perturbation measurement.

Main Methods:

  • Study of Rayleigh and Brillouin scattering processes in optical fibers.
  • Analysis of sensing techniques for dynamic perturbations.
  • Case study of recent advancements in the field.

Main Results:

  • Rayleigh-based sensors offer extended sensing and higher frequency ranges but have limited spatial resolution (1 m).
  • Brillouin-based sensors achieve higher spatial resolution but have comparatively lower frequency and sensing ranges.

Conclusions:

  • Both Rayleigh and Brillouin scattering-based distributed optical fiber sensors are suitable for dynamic vibration measurement.
  • The choice between Rayleigh and Brillouin depends on the specific application requirements regarding range, frequency, and spatial resolution.