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Related Concept Videos

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...
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Measurements of Strain01:27

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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...
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True Stress and True Strain01:28

True Stress and True Strain

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Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
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Transformation of Plane Strain01:12

Transformation of Plane Strain

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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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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 the...
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Multi-scale approach for strain-engineering of phosphorene.

Daniel Midtvedt1, Caio H Lewenkopf2, Alexander Croy3

  • 1Department of Physics, Chalmers University of Technology, Gothenburg, Sweden.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 16, 2017
PubMed
Summary
This summary is machine-generated.

We present a multi-scale model for deformed phosphorene, linking strain to atomic motion and electronic properties. This approach enables large-scale simulations of phosphorene devices, like exciton funnels.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Phosphorene, a 2D material, exhibits unique electronic and mechanical properties.
  • Deformation significantly alters phosphorene's properties, impacting device performance.
  • Accurate theoretical models are crucial for understanding and utilizing deformed phosphorene.

Purpose of the Study:

  • To develop a multi-scale theoretical approach for describing deformed phosphorene.
  • To enable large-scale modeling of phosphorene-based devices under strain.
  • To investigate the electromechanical properties of inhomogeneously deformed phosphorene.

Main Methods:

  • Combined a valence-force model (VFM) with a tight-binding (TB) model.
  • VFM relates macroscopic strain to microscopic atomic displacements.
  • TB model with distance-dependent hopping parameters calculates electronic properties.
  • Developed a self-consistent electromechanical model.

Main Results:

  • The multi-scale model accurately describes the electromechanical coupling in deformed phosphorene.
  • Demonstrated the model's suitability for large-scale simulations.
  • Investigated an inhomogeneously deformed phosphorene drum as a potential exciton funnel.

Conclusions:

  • The presented multi-scale electromechanical model is effective for theoretical descriptions of deformed phosphorene.
  • This approach facilitates the design and simulation of advanced phosphorene devices.
  • Deformed phosphorene holds promise for applications such as exciton funnels.