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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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Problem Solving on Stress and Strain01:22

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Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
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Elastic Strain Energy for Normal Stresses

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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.
If...
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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.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
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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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Elasticity in Concrete01:20

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Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
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Programming viscoelastic properties in a complexation gel composite by utilizing entropy-driven topologically

Gui Kang Wang1,2, Yi Ming Yang1,2, Di Jia3,4

  • 1Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

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Researchers created tunable hydrogel composites by controlling physical interactions, not chemistry. This allows precise tuning of viscoelastic properties for biomaterials and tissue engineering applications.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Soft Matter Physics

Background:

  • Hydrogel composites with tunable viscoelastic properties are crucial for mimicking biological tissues and developing biosensors.
  • Current methods for tuning hydrogel properties often require altering chemistry, limiting physical control.
  • Precisely controlling physical interactions and structures is essential for tailoring viscoelasticity.

Purpose of the Study:

  • To design a complexation hydrogel composite with tunable viscoelastic properties.
  • To utilize the principle of topologically frustrated dynamical states to control hydrogel structure.
  • To establish a relationship between entropy-driven correlated structures and viscoelastic properties.

Main Methods:

  • Designed a complexation gel composite using guest polycation chains and host gels.
  • Employed the physical principle of topologically frustrated dynamical states.
  • Quantified host gel mesh size and guest chain size.
  • Investigated entropy effects on swelling ratio.

Main Results:

  • Precisely tuned viscoelastic properties from tough to ultrasoft and elastic-like to viscous-like.
  • Developed a viscoelastic moduli map based on topological correlations.
  • Discovered an Entropy-driven Topologically Isovolumetric Point.
  • Established a quantitative link between structure and viscoelasticity.

Conclusions:

  • Physical control over hydrogel structure offers a versatile method for tuning viscoelastic properties.
  • The findings provide fundamental physics for understanding complexation hydrogel behavior.
  • This work has significant implications for tissue engineering and soft biomaterials design.