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Related Concept Videos

Shearing Strain01:20

Shearing Strain

1.6K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
1.6K
Shearing Stress01:18

Shearing Stress

2.1K
Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
2.1K
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...
552
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

2.0K
Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
2.0K
Measurements of Strain01:27

Measurements of Strain

2.6K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.6K
Principal Stresses01:24

Principal Stresses

888
The graphical depiction of normal and shearing stress equations is represented by a circle, demonstrating the interplay between these stresses under different angular conditions. The center of this circle C, located on the vertical axis, represents the average normal stress, while its radius shows the range of stress variations. At points A and B, where the circle intersects the horizontal axis, the maximum and minimum normal stresses are observed, occurring without shearing stress. These...
888

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Single Molecule Methods for Monitoring Changes in Bilayer Elastic Properties
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Measuring Interlayer Shear Stress in Bilayer Graphene.

Guorui Wang1,2, Zhaohe Dai1,3,4, Yanlei Wang5

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.

Physical Review Letters
|August 5, 2017
PubMed
Summary

Researchers measured interlayer shear stress in bilayer graphene using microscale bubbles. They found a shear stress of 40 kPa for bilayer graphene and 1.64 MPa for monolayer graphene on silicon oxide.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Two-dimensional (2D) materials offer unique properties, with stacked multilayer structures holding significant application potential.
  • Understanding interlayer and interfacial shear interactions is critical for the performance and reliability of multilayer 2D material systems.
  • Key parameters governing shear deformation in 2D materials remain largely unexplored.

Purpose of the Study:

  • To experimentally determine the interlayer shear stress of bilayer graphene.
  • To measure the interfacial shear stress of monolayer graphene on a silicon oxide substrate.
  • To establish a method for characterizing shear properties in 2D materials.

Main Methods:

  • Utilized pressurized microscale bubble loading devices for mechanical testing.
  • Employed membrane analysis to extract shear stress values from bubble deformation.
  • Investigated shear zone formation at the interface of bilayer graphene.

Main Results:

  • Successfully measured the interlayer shear stress of bilayer graphene to be 40 kPa.
  • Determined a significantly higher interfacial shear stress of 1.64 MPa for monolayer graphene on silicon oxide.
  • Observed continuous growth of an interlayer shear zone outside the bubble edge.

Conclusions:

  • Provided the first measurement of interlayer shear stress in bilayer graphene.
  • Highlighted the substantial difference in shear stress between bilayer and monolayer graphene interfaces.
  • Established a novel experimental approach for characterizing fundamental shear properties of 2D materials for multilayer applications.