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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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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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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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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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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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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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Studying Large Amplitude Oscillatory Shear Response of Soft Materials
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Elasticity-controlled jamming criticality in soft composite solids.

Yiqiu Zhao1, Haitao Hu2, Yulu Huang2

  • 1Department of Physics, The Hong Kong University of Science and Technology, Hong Kong SAR, China. yiqiuzhao@ust.hk.

Nature Communications
|February 24, 2024
PubMed
Summary
This summary is machine-generated.

This study reveals how the mechanical properties of soft composite solids, like biological tissues, are governed by particle jamming. Engineering these jamming properties offers a new way to design advanced composite materials.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Biomechanics

Background:

  • Soft composite solids, featuring inclusions in soft matrices, are vital in nature and engineering.
  • Classical composite mechanics struggle to predict properties of densely filled materials due to complex interactions.

Purpose of the Study:

  • Investigate the mechanics of soft elastomers with high concentrations of stiff microspheres.
  • Develop a framework to predict mechanical properties based on particle behavior.

Main Methods:

  • Systematic experimental investigation of densely filled soft elastomers.
  • Analysis of strain-stiffening response near a shear-jamming transition.
  • Development of a criticality framework linking material properties.

Main Results:

  • Demonstrated strain-stiffening governed by critical scalings near shear-jamming.
  • Established a quantitative connection between composite mechanics, matrix, and particle elasticity.
  • Observed diverse mechanical responses across various material parameters.

Conclusions:

  • Uncovered a novel design paradigm for soft composites based on inclusion jamming properties.
  • The criticality framework accurately predicts mechanical behavior of densely filled soft composites.
  • Findings offer new strategies for engineering advanced composite materials.