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Related Concept Videos

Shearing Strain01:20

Shearing Strain

521
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...
521
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

299
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.
299
Mohr's Circle for Plane Strain01:18

Mohr's Circle for Plane Strain

576
Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
Mohr's circle visually represents the strain states under various conditions, which is essential for...
576
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

231
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...
231
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

260
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
260
Shearing Stress01:19

Shearing Stress

747
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.
747

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Related Experiment Video

Updated: Jul 25, 2025

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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Shear Strain-Induced Two-Dimensional Slip Avalanches in Rhombohedral MoS2.

Jing Liang1,2, Dongyang Yang1,2, Yunhuan Xiao1,2

  • 1Department of Physics and Astronomy, The University of British Columbia, Vancouver, BC V6T 1Z1, Canada.

Nano Letters
|June 26, 2023
PubMed
Summary

Researchers observed two-dimensional (2D) slip avalanches in molybdenum disulfide (MoS2) triggered by shear strain. This finding reveals how strain impacts 2D material structure and properties.

Keywords:
2D materialsferroelectricitymechanical exfoliationshear strainslip avalanche

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Slip avalanches are well-understood in 3D materials, impacting plastic deformation and fragmentation.
  • The behavior of slip avalanches in two-dimensional (2D) materials under shear strain remains largely unexplored.
  • Understanding shear strain effects is crucial for manipulating 2D material properties.

Purpose of the Study:

  • To investigate the occurrence and characteristics of slip avalanches in 2D materials.
  • To explore the influence of shear strain on the stacking order of 2D materials.
  • To provide insights into the fundamental physical phenomena governing 2D material behavior.

Main Methods:

  • Experimental observation of slip avalanches in exfoliated rhombohedral molybdenum disulfide (MoS2).
  • Application of shear strain near the threshold level to trigger avalanches.
  • Utilizing interfacial polarization in 3R-MoS2 to probe stacking order in multilayer flakes.

Main Results:

  • Evidence of two-dimensional (2D) slip avalanches triggered by shear strain in MoS2 was observed.
  • A diverse range of polarization domains with sizes following a power-law distribution were discovered.
  • The study indicates that shear strain can alter the stacking order of 2D materials.

Conclusions:

  • Slip avalanches can occur during the exfoliation process of 2D materials.
  • Shear strain plays a significant role in modifying the stacking order and atomic structure of 2D materials.
  • These findings have critical implications for designing new materials and technologies requiring precise structural control.