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Related Concept Videos

Transformation of Plane Strain01:12

Transformation of Plane Strain

168
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.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
168
Shearing Strain01:20

Shearing Strain

280
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...
280
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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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...
217
Transformation of Plane Stress01:18

Transformation of Plane Stress

230
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
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Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

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Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
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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

267
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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Related Experiment Video

Updated: Jul 4, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Uniaxial Strain-Induced Stacking Order Change in Trilayer Graphene.

Aditya Dey1, Ahmad Azizimanesh2, Stephen M Wu2

  • 1Department of Mechanical Engineering, University of Rochester, New York 14627, United States.

ACS Applied Materials & Interfaces
|January 31, 2024
PubMed
Summary

Researchers discovered a universal mechanism for creating stable ABC-trilayer graphene. This strain engineering technique uses interlayer slippage to transform less stable ABA stacking into desired ABC domains for advanced devices.

Keywords:
Atomistic simulationsRaman measurementsStacking order changeStrain engineeringTrilayer graphene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Layer stacking order in 2D heterostructures significantly impacts physical properties and applications.
  • ABC-trilayer graphene shows potential for correlated electronic states but is thermodynamically less stable than ABA stacking.
  • Mechanisms for inducing stable ABC stacking via external perturbations like strain are not fully understood.

Purpose of the Study:

  • To unveil a universal mechanism for achieving stable ABC stacking in trilayer graphene.
  • To investigate the interfacial mechanisms driving ABA to ABC stacking transitions.
  • To provide a controllable method for engineering ABC graphene domains.

Main Methods:

  • Novel strain engineering technique inducing interlayer slippage.
  • Computational simulations including atomistic simulations and local energy analysis.
  • Experimental validation using Raman spectroscopy.

Main Results:

  • Demonstrated a highly anisotropic transformation from ABA to stable ABC domains via interlayer slippage.
  • Identified a strain-induced stacking transition mechanism dependent on loading orientation.
  • Validated the formation of distinct ABC domains using Raman spectroscopy.

Conclusions:

  • A universal mechanism for ABA to ABC stacking transition in trilayer graphene was elucidated.
  • The developed strain engineering technique offers a robust and controllable method for creating stable ABC domains.
  • Findings facilitate the design of ABC graphene for advanced optoelectronic devices.