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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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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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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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A cohesive granular material with tunable elasticity.

Arnaud Hemmerle1, Matthias Schröter1,2, Lucas Goehring1,3

  • 1Max Planck Institute for Dynamics and Self-Organization (MPIDS), Göttingen, 37077, Germany.

Scientific Reports
|October 25, 2016
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Summary

Researchers created a tunable cohesive granular medium using glass beads and polymer bridges. This material mimics wet granular systems and allows control over mechanical properties, offering insights into rock fracturing and soil mechanics.

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Area of Science:

  • Materials Science
  • Physics
  • Geophysics

Background:

  • Granular materials are ubiquitous in nature and industry.
  • Understanding their mechanical behavior is crucial for various applications.
  • Existing models often lack precise control over inter-particle bond properties.

Purpose of the Study:

  • To develop a model system for studying cohesive granular media.
  • To investigate the influence of bond properties on mechanical response.
  • To analyze failure mechanisms in such materials.

Main Methods:

  • Fabricating a cohesive granular medium by mixing glass beads with a curable polymer.
  • Characterizing mechanical response by varying bridge size/stiffness and particle size.
  • Observing failure mechanisms using unconfined uniaxial compression and in situ x-ray microtomography.

Main Results:

  • The material exhibits tunable mechanical responses over several orders of magnitude.
  • A broad linear-elastic regime was observed, ending at approximately 8% strain.
  • Shear failure initiates at this limiting strain, irrespective of bond stiffness.

Conclusions:

  • The developed material serves as an ideal model for cohesive granular systems.
  • Tunable properties allow for diverse applications in geophysics and soil science.
  • Provides a platform for studying phenomena like rock fracturing and root growth.