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Related Concept Videos

Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
654
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.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
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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

Measurements of Strain

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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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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

326
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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Mohr's Circle for Plane Strain01:18

Mohr's Circle for Plane Strain

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Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
Mohr's circle visually represents the strain states under various conditions, which is essential for...
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Related Experiment Video

Updated: Sep 8, 2025

Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses
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Myopic Strain: a normalized metric concept for assessing axial myopia.

Qi Ren1, Zhe Chu2

  • 1Department of Ophthalmology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.

Frontiers in Ophthalmology
|August 20, 2025
PubMed
Summary

A new metric, Myopic Strain, effectively quantifies axial myopia severity by normalizing retinal defocus distance to focal length. This metric shows strong correlations with refractive error and biomechanical markers, offering a superior assessment of axial elongation in myopia.

Keywords:
Myopic Strainaxial myopiaretinal defocusspherical equivalent refractive errorstress-strain index

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optometry

Background:

  • Axial myopia is defined by excessive axial elongation, traditionally measured by axial length (AL).
  • Axial length (AL) measurement conflates the eye's focal distance with its defocus distance, limiting its precision in assessing myopia progression.
  • A novel, normalized metric is needed to accurately quantify the severity of axial myopia.

Purpose of the Study:

  • To develop and validate a new metric, Myopic Strain, for assessing axial myopia.
  • To evaluate the correlation of Myopic Strain with established optical and biomechanical markers of myopia.
  • To compare the performance of Myopic Strain against the axial length to corneal curvature radius (AL/CR) ratio.

Main Methods:

  • Developed Myopic Strain, calculated as the ratio of retinal defocus distance (ΔAL) to the eye's focal length.
  • Applied Morgan's optometric model to derive ΔAL and Myopic Strain from data of 242 eyes.
  • Analyzed correlations between Myopic Strain and spherical equivalent refractive error (SER), and stress-strain index (SSI).

Main Results:

  • Myopic Strain demonstrated significant correlations with SER (r = -0.81) and SSI (r = -0.30) (p < 0.001).
  • Myopic Strain explained a greater proportion of variance in SER (R² = 0.65) compared to other metrics.
  • A strong positive correlation was found between Myopic Strain and AL (r = 0.82, p < 0.001).

Conclusions:

  • Myopic Strain is a validated, normalized metric suitable for assessing axial myopia severity.
  • This novel metric offers improved quantification of myopia compared to traditional axial length measurements.
  • Myopic Strain shows significant associations with key optical and biomechanical indicators of myopia.