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Related Concept Videos

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...
241
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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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.
If...
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Shearing Strain01:20

Shearing Strain

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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...
552
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

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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.
308
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

268
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...
268
Transformation of Plane Strain01:12

Transformation of Plane Strain

215
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
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Ultrafast Optomechanical Strain in Layered GeS.

Duan Luo1,2,3,4, Baiyu Zhang5, Edbert J Sie4,6

  • 1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.

Nano Letters
|March 10, 2023
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Summary

Researchers observed optically driven ultrafast in-plane strain in germanium sulfide (GeS), a 2D material. This discovery enables new methods for ultrafast optomechanical control and strain engineering in devices.

Keywords:
2D materialsoptomechanical couplingphotostrictive effectstrain engineeringultrafast electron diffraction

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Strong light-matter interactions are crucial for advanced optical micro- and nano-electromechanical systems.
  • Two-dimensional (2D) materials offer unique optomechanical properties due to their layered structure and weak van der Waals bonds.

Purpose of the Study:

  • To experimentally observe and characterize optically driven ultrafast strain in 2D materials.
  • To investigate the underlying mechanisms responsible for photoinduced structural deformation in germanium sulfide (GeS).

Main Methods:

  • Meg electronvolt ultrafast electron diffraction (MeV-UFED) was employed to probe structural dynamics.
  • Experimental measurements were combined with theoretical investigations.

Main Results:

  • Ultrafast in-plane strain was observed in GeS with strain amplitudes of approximately 0.1% and a response time of 10 picoseconds (ps).
  • A significant in-plane anisotropy in strain was detected between zigzag and armchair crystallographic directions.
  • The observed strain was attributed to electronic density redistribution and converse piezoelectric effects, rather than thermal effects.

Conclusions:

  • Optically driven ultrafast strain in 2D materials like GeS can be achieved with significant anisotropy.
  • These findings open new possibilities for ultrafast optomechanical control and strain engineering in functional devices.