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Related Concept Videos

Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

289
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...
289
Stress Concentrations01:24

Stress Concentrations

374
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
374
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

376
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
376
True Stress and True Strain01:28

True Stress and True Strain

404
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.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
404
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.
326
Stress-Strain Diagram01:10

Stress-Strain Diagram

828
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Regional Biomechanical and Topographic Changes after Transepithelial vs. Epithelium-off Continuous Accelerated Corneal Cross-linking in Keratoconus: Updated Stress-Strain Index as a Superior Biomarker.

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Related Experiment Video

Updated: Sep 10, 2025

Three Different Protocols of Corneal Collagen Crosslinking in Keratoconus: Conventional, Accelerated and Iontophoresis
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Evaluating corneal cross-linking using Stress-Strain Index maps: a finite element study.

Chenyan Wang1,2,3, Yuanwan Lou1, Yabo Ye1

  • 1Oujiang Laboratory, Wenzhou, Zhejiang, People's Republic of China.

Journal of the Royal Society, Interface
|August 26, 2025
PubMed
Summary

This study introduces Stress-Strain Index (SSI) mapping to personalize corneal collagen cross-linking (CXL) for keratoconus (KC). SSI maps guide CXL to precisely target weakened corneal areas, improving biomechanical restoration and patient outcomes.

Keywords:
Stress–Strain Indexbiomechanicscollagen cross-linkingfinite element analysiskeratoconus

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Corneal Biomechanics

Background:

  • Keratoconus (KC) is a progressive corneal disease causing visual impairment.
  • Corneal collagen cross-linking (CXL) strengthens corneas but lacks personalized treatment strategies.
  • Regional corneal stiffness is vital for effective CXL outcomes.

Purpose of the Study:

  • To develop and evaluate Stress-Strain Index (SSI) mapping for assessing localized CXL effects.
  • To enable biomechanics-based customization of CXL treatments for KC.
  • To investigate the impact of CXL parameters on corneal stiffness recovery.

Main Methods:

  • Utilized finite element method (FEM) for inverse analysis of human eye models.
  • Incorporated regional stiffness variations based on collagen fibril density.
  • Generated pre- and post-CXL SSI maps to quantify localized stiffness changes.

Main Results:

  • CXL effectively increased corneal stiffness in treated areas.
  • Stiffness recovery varied significantly with CXL diameter and alignment with the KC cone.
  • Smaller CXL diameters and precise alignment yielded superior biomechanical restoration.

Conclusions:

  • SSI mapping offers a novel approach for personalized CXL treatment planning.
  • Targeting biomechanically weakened regions with SSI guidance enhances corneal health restoration.
  • This method advances biomechanics-based customization for CXL therapies in KC management.