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Related Concept Videos

Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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...
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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.
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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...
Hooke's Law01:26

Hooke's Law

Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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...
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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 a...

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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
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Published on: July 24, 2015

Elastic fields and moduli in defected graphene.

Riccardo Dettori1, Emiliano Cadelano, Luciano Colombo

  • 1Dipartimento di Fisica dell'Università of Cagliari, Cittadella Universitaria, I-09042 Monserrato (Cagliari), Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 23, 2012
PubMed
Summary
This summary is machine-generated.

Native defects in graphene, detected experimentally, have high formation energies. These defects cause significant stress and deformation, impacting graphene

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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets

Published on: November 7, 2016

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Native defects in graphene have been experimentally detected.
  • Understanding these defects is crucial for graphene's applications.

Purpose of the Study:

  • To investigate the properties of native defects in graphene using atomistic simulations.
  • To characterize the deformation and stress fields induced by these defects.
  • To analyze the impact of defects on graphene's elastic properties.

Main Methods:

  • Tight-binding atomistic simulations.
  • Analysis of defect formation energy.
  • Characterization of stress and deformation fields.
  • Investigation of elastic moduli.

Main Results:

  • Defects exhibit high formation energies (several electronvolts).
  • Defects induce sizable, symmetry-related deformation and stress fields.
  • Defects decrease Young's modulus and Poisson ratio.
  • The effect on elastic moduli is more pronounced for vacancy-like defects.

Conclusions:

  • The study provides a framework for characterizing electron microscopy images of defects.
  • The findings offer insights into defect interactions.
  • Defect type and density significantly influence graphene's mechanical properties.