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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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Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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The bulk modulus is a scientific term used to describe a material's resistance to uniform compression. It is the proportionality constant that links a change in pressure to the resulting relative volume change.
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The fineness modulus (FM) of aggregate is a numerical index that measures the coarseness or fineness of the particles. It is calculated by adding the cumulative percentages of aggregate retained on each of a specified series of sieves and dividing the sum by 100.
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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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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Interlinked Macroporous 3D Scaffolds from Microgel Rods
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Auxeticity of Concentric Auxetic-Conventional Foam Rods with High Modulus Interface Adhesive.

Teik-Cheng Lim1

  • 1School of Science and Technology, Singapore University of Social Sciences, Singapore 599494, Singapore. tclim@suss.edu.sg.

Materials (Basel, Switzerland)
|February 1, 2018
PubMed
Summary

This study examines tri-layered rods under torsion, finding that adhesive properties significantly impact auxeticity. Auxeticity, a measure of negative Poisson

Keywords:
adhesiveauxeticconcentric cylindersfoamtorsiontri-layered

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Composite Materials

Background:

  • The rule of mixture accurately predicts Poisson's ratio for bi-layered rods under longitudinal load.
  • Torsional loading of bi-layered rods deviates from simple rule of mixture predictions due to complex deformation patterns.
  • Adhesives in layered rods create a tri-layered structure, complicating mechanical behavior analysis.

Purpose of the Study:

  • Investigate the influence of adhesive properties on the auxeticity of tri-layered cylindrical rods under torsional loads.
  • Analyze how adhesive stiffness, Poisson's ratio, thickness, and radial position affect overall rod auxeticity.
  • Determine an indirect method to calculate the Poisson's ratio of concentrically tri-layered rods.

Main Methods:

  • Employed a mechanics of materials approach to derive the Poisson's ratio for a tri-layered rod.
  • Focused on concentrically aligned cylindrical isotropic foams with opposing Poisson's ratios.
  • Simulated torsional loading conditions to analyze deformation and auxetic behavior.

Main Results:

  • Adhesive stiffness is a key factor influencing the auxeticity of the tri-layered rod.
  • The Poisson's ratio of the adhesive layer directly impacts the overall auxetic response.
  • Rod auxeticity is sensitive to adhesive thickness and its radial distribution relative to the torsional axis.

Conclusions:

  • Adhesive properties critically govern the auxeticity of tri-layered rods under torsion.
  • The mechanics of materials approach provides a viable method for analyzing complex layered structures.
  • Understanding adhesive effects is crucial for designing advanced auxetic materials and structures.