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Related Concept Videos

Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

422
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
422
Deformations in a Transverse Cross Section01:21

Deformations in a Transverse Cross Section

570
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
570
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

564
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...
564
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

442
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
442
Transformation of Plane Strain01:12

Transformation of Plane Strain

470
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...
470
Plastic Deformations01:14

Plastic Deformations

374
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
374

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Related Experiment Video

Updated: Jan 7, 2026

Quantification of Strain in a Porcine Model of Skin Expansion Using Multi-View Stereo and Isogeometric Kinematics
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Quantification of Strain in a Porcine Model of Skin Expansion Using Multi-View Stereo and Isogeometric Kinematics

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Local deformations quantified with the common sublattice method.

János L Lábár1, Ildikó Cora1, Béla Pécz1

  • 1Thin Film Physics Laboratory, Institute of Technical Physics and Materials Science, HUN-REN Centre for Energy Research, Konkoly Thege M. út 29-33, H-1121 Budapest, Hungary. labar.janos@ek.hun-ren.hu.

Nanoscale
|January 2, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to measure strain in epitaxial layers by identifying unstrained substrate references. This technique accurately quantifies local lattice deformations in different crystal structures, improving upon existing methods.

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Area of Science:

  • Materials Science
  • Crystallography
  • Solid-State Physics

Background:

  • Measuring strain in epitaxial layers requires unstrained reference regions.
  • Existing methods like HRTEM have limitations in localizing these references.

Purpose of the Study:

  • To develop a novel method for deducing unstrained substrate references.
  • To determine local lattice deformations in epitaxial layers with different crystal structures.

Main Methods:

  • Utilizing a common sublattice between the substrate and epitaxial layer.
  • Interrelating experimental data by analyzing deviations from the common sublattice.
  • Proof-of-concept using cubic γ-Ga2O3 layers on monoclinic β-Ga2O3 substrate.

Main Results:

  • Successfully developed and validated a new method for strain measurement.
  • The method accurately determines local lattice deformations.
  • Achieved a precision of approximately 0.5% in strain values.

Conclusions:

  • The new method overcomes limitations of traditional HRTEM-based approaches.
  • Provides a precise and reliable way to measure strain in heterostructures.
  • Applicable to systems with common sublattices, enabling accurate material characterization.