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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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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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Measurements of Strain01:27

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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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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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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.
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Elastic Strain Energy for Normal Stresses01:22

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Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
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Dynamic Modulus of Elasticity of Concrete01:16

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
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Author Spotlight: Characterizing Environmental Biofilm Mechanics Using Optical Coherence Elastography and its Applications in Wastewater Treatment
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Quantitative Optical Coherence Elastography for Robust Stiffness Assessment.

Xuan Liu1, Farzana Zaki1, Yahui Wang1

  • 1Department of Electrical and Computer Engineering, New Jersey Institute of Technology, University Heights, Newark, NJ 07102, USA.

Applied Sciences (Basel, Switzerland)
|July 1, 2020
PubMed
Summary
This summary is machine-generated.

Quantitative optical coherence elastography (qOCE) can reliably measure material stiffness. This technique accurately assesses mechanical properties under various boundary conditions by analyzing forces and displacements.

Keywords:
optical coherence elastographyoptical coherence tomographyoptical sensing and sensorstissue characterization

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Area of Science:

  • Biomedical Engineering
  • Optical Physics
  • Materials Science

Background:

  • Accurate material stiffness assessment is crucial for diagnostics and engineering.
  • Quantitative Optical Coherence Elastography (qOCE) offers a non-invasive method for mechanical property evaluation.

Purpose of the Study:

  • To demonstrate the capability of qOCE for robust material stiffness assessment.
  • To validate qOCE under diverse boundary conditions.

Main Methods:

  • Utilized quantitative optical coherence elastography (qOCE).
  • Analyzed reaction force and displacement fields within the sample.
  • Applied varying boundary conditions to the material samples.

Main Results:

  • Successfully demonstrated robust assessment of material stiffness using qOCE.
  • Showcased the technique's effectiveness across different boundary conditions.
  • Validated the correlation between measured forces, displacements, and material stiffness.

Conclusions:

  • qOCE is a capable tool for quantitative material stiffness evaluation.
  • The method provides reliable mechanical property assessment irrespective of boundary conditions.
  • This technique holds promise for applications requiring precise material characterization.