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Related Concept Videos

Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Bending and Torsional Moments01:20

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Bending and torsional moments are two fundamental concepts in structural engineering. They play an important role in understanding the behavior of materials and structures under different loading conditions.
The reaction developed in a structural element when subjected to an external force causes the element to bend. When a structural element bends upwards, it creates compressive normal forces on the top and tensile normal forces on the bottom, resulting in a couple that determines the bending...
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Thin-Walled Hollow Shafts01:15

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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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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Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

177
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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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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Updated: Jul 8, 2025

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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A Torsion-Based Rheometer for Measuring Viscoelastic Material Properties.

Merrill Asp1, Elise Jutzeler1,2, Jakub Kochanowski1

  • 1Physics Department and BioInspired Institute, Syracuse University, Syracuse, NY, USA.

Biophysicist (Rockville, Md.)
|December 15, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a low-cost, portable rheometer for studying viscoelastic materials. This affordable device makes rheology accessible for education and field research, overcoming the limitations of expensive, lab-bound equipment.

Keywords:
DIYhigh schoolinexpensivelab activitiesmechanicsportablerheologytake-homeundergraduateviscoelasticity

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Area of Science:

  • Biophysics
  • Materials Science
  • Engineering

Background:

  • Rheology, the study of viscoelastic materials, is crucial in engineering and biophysical systems, with applications in disease research like cancer.
  • Traditional rheometers are prohibitively expensive and bulky, restricting their use to specialized laboratories and hindering broader educational and field applications.

Purpose of the Study:

  • To develop a cost-effective and portable rheometer design.
  • To make the study of viscoelasticity more accessible for high school education and field-based research.

Main Methods:

  • A novel rheometer design was developed, focusing on reducing cost and increasing portability.
  • The design achieves functionality at less than one-tenth the cost of professional rheometers.

Main Results:

  • The developed rheometer is significantly more affordable than commercial alternatives.
  • The portable design allows for rheological data collection outside of traditional laboratory settings.

Conclusions:

  • This low-cost, portable rheometer democratizes the study of viscoelasticity.
  • It serves as an ideal tool for introducing rheological concepts in educational settings and for practical field applications.