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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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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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Elastic Strain Energy for Normal Stresses01:22

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.
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Plastic Behavior01:21

Plastic Behavior

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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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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Chemically Driven Nano-Elastic Heterogeneities Control Fragility in Volcanic Melts.

Michele Cassetta1,2, Daria Szewczyk3, Gabriele Giuliani4

  • 1Department of Engineering for Innovation Medicine, University of Verona, Verona, I-37134, Italy.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 8, 2025
PubMed
Summary
This summary is machine-generated.

This study explores how nanoscale structures in volcanic glasses influence mechanical properties. Increased silica content correlates with greater structural heterogeneity, impacting elastic moduli and melt fragility.

Keywords:
elasticityfragilityheterogeneitiessilicate glassesviscosity

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Area of Science:

  • Geochemistry
  • Materials Science
  • Physics

Background:

  • Volcanic glasses exhibit complex mechanical behaviors influenced by their nanoscale structure.
  • Understanding the relationship between composition and rheology is crucial for materials science and geology.

Purpose of the Study:

  • To investigate the nanoscale structural drivers of mechanical behavior in silicate glasses across a compositional range.
  • To quantify parameters like correlation length (ξ) and microscopic free volume (Vc) and their link to mechanical properties.

Main Methods:

  • Characterization of synthetic silicate glass-forming melts using a granular-medium framework.
  • Quantification of vibrational and physical properties to determine structural parameters.
  • Analysis of compositional series from basalt to rhyolite.

Main Results:

  • Both correlation length (ξ) and microscopic free volume (Vc) increase systematically with silica content.
  • Higher ξ and Vc show strong inverse correlations with elastic moduli and melt fragility.
  • Medium-range order variations significantly affect the elastic and viscous response of silicate melts.

Conclusions:

  • Compositional changes in silicate glasses directly impact nanoscale structural heterogeneity.
  • This heterogeneity quantitatively links to variations in elastic moduli and rheological behavior.
  • Provides a framework for understanding the mechanical evolution of volcanic and technical glasses.