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Related Concept Videos

Shearing Strain01:20

Shearing Strain

1.0K
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...
1.0K
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

442
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.
442
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

476
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...
476
Transformation of Plane Strain01:12

Transformation of Plane Strain

407
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...
407
Hooke's Law01:26

Hooke's Law

1.2K
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
1.2K
Thermal Strain01:19

Thermal Strain

2.7K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.7K

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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Structure-Dependent Strain Effects.

Elisabeth M Dietze1, Henrik Grönbeck1

  • 1Department of Physics and Competence Centre for Catalysis, Chalmers University of Technology, 41296, Göteborg, Sweden.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|September 23, 2020
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Summary

Strain significantly impacts atomic and molecular adsorption on metal surfaces. Compressive strain destabilizes three-fold hollow sites but often stabilizes four-fold sites, offering insights for chemical property modification.

Keywords:
computational chemistrydensity functional theorystrainsurface sciencetransition metal surfaces

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Area of Science:

  • Surface Science
  • Computational Chemistry
  • Materials Science

Background:

  • Atomic and molecular adsorption on metal surfaces is crucial for catalysis and materials science.
  • Understanding how surface structure and strain influence adsorption is key to designing new materials.
  • Previous studies have explored strain effects, but a systematic analysis across different sites and surfaces is needed.

Purpose of the Study:

  • To investigate the impact of strain on atomic and molecular adsorption on (111) and (100) metal surfaces.
  • To elucidate the surface and structure-dependent nature of strain effects.
  • To provide a theoretical framework for strain engineering of surface chemical properties.

Main Methods:

  • Employing density functional theory (DFT) calculations.
  • Analyzing adsorption energies for various atomic and molecular species on different metal surfaces.
  • Utilizing a simple two-orbital model for qualitative explanation.

Main Results:

  • Strain exerts significant, site-dependent effects on adsorption energies.
  • Compressive strain destabilizes adsorption in three-fold hollow sites.
  • Tensile strain or less compressive strain commonly stabilizes adsorption in four-fold sites.

Conclusions:

  • Surface and structure-dependent strain effects can be harnessed to tune adsorption properties.
  • Strain engineering offers a viable strategy for modifying surface chemical reactivity.
  • The findings provide fundamental insights for designing catalysts and functional materials.