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Related Concept Videos

Stress Concentrations01:24

Stress Concentrations

595
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...
595
Stress Concentrations01:13

Stress Concentrations

564
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
564
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

514
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....
514
Distribution of Stresses in a Narrow Rectangular Beam01:11

Distribution of Stresses in a Narrow Rectangular Beam

468
In studying beam stress distribution, examining an elemental section is essential. To determine the average shearing stress on this face, the calculated shear is divided by the surface area. Importantly, shearing stresses on the beam's transverse and horizontal planes mirror each other, indicating a consistent stress distribution along the upper region of the beam. Notably, shearing stresses are absent at the beam's upper and lower surfaces due to the absence of applied forces in these...
468
Flexural Stress01:16

Flexural Stress

657
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
657
Transformation of Plane Stress01:18

Transformation of Plane Stress

666
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
666

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Related Experiment Video

Updated: Jan 8, 2026

Full-Field Optical Coherence Microscopy for Histology-Like Analysis of Stromal Features in Corneal Grafts
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Determining Stress Distribution in a Longitudinal Keratoconus Cohort.

Magali M S Vandevenne1,2, Cynthia J Roberts3,4, Mathew Francis5

  • 1University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, the Netherlands.

Cornea
|December 11, 2025
PubMed
Summary
This summary is machine-generated.

Keratoconus progression can be predicted by analyzing corneal stress patterns. The difference in corneal stress (CCSdiff) at baseline helps forecast changes in corneal curvature over time.

Keywords:
biomechanicscorneakeratoconusprogressionstress distribution

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Area of Science:

  • Ophthalmology
  • Biomechanical Engineering
  • Corneal Imaging Analysis

Background:

  • Keratoconus is a progressive corneal ectasia characterized by thinning and steepening.
  • Accurate prediction of keratoconus progression is crucial for timely intervention and management.
  • Current methods for predicting progression have limitations in capturing early biomechanical changes.

Purpose of the Study:

  • To evaluate if stress distribution patterns in keratoconus eyes can predict future biomechanical progression.
  • To utilize longitudinal data to assess the predictive capability of corneal stress parameters.

Main Methods:

  • Calculated corneal contribution to stress (CCS) using a modified Hoop stress formula (CCS = r/2t).
  • Analyzed CCS from Pentacam curvature and thickness maps, focusing on the difference between minimum and maximum CCS zones (CCSdiff).
  • Employed a linear mixed model to assess the predictive ability of CCSdiff on longitudinal changes in corneal curvature (Cspot).

Main Results:

  • Included 114 keratoconus eyes and 31 healthy control eyes.
  • Baseline CCSdiff in keratoconus eyes was significantly correlated with maximum zonal tangential curvature (Cspot) (r = 0.83, P < 0.001).
  • Baseline CCSdiff was a significant predictor of Cspot progression over time (P < 0.001).

Conclusions:

  • The difference in corneal stress distribution (CCSdiff) is dynamic and changes over time.
  • Baseline CCSdiff values effectively predict future biomechanical progression in keratoconus patients.
  • This stress-based metric offers a novel approach for monitoring keratoconus progression.