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Shearing Strain01:20

Shearing Strain

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...
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

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.
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
Hooke's Law01:26

Hooke's Law

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.
Problem Solving on Stress and Strain01:22

Problem Solving on Stress and Strain

Stress is a quantity that describes the magnitude of a force that causes deformation, generally defined as internal force per unit area. When forces pull on an object and cause its elongation, like the stretching of an elastic band, it is called tensile stress. When forces cause the compression of an object, it is known as compressive stress. When an object is being squeezed uniformly from all sides, like a submarine in the depths of the ocean, we call this kind of stress bulk stress (or volume...
Circular Shaft - Stresses in Linear Range01:13

Circular Shaft - Stresses in Linear Range

Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.

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Related Experiment Video

Updated: May 25, 2026

Automated Compression Testing of the Ocular Lens
05:19

Automated Compression Testing of the Ocular Lens

Published on: April 5, 2024

Shear modulus data for the human lens determined from a spinning lens test.

G S Wilde1, H J Burd, S J Judge

  • 1Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK.

Experimental Eye Research
|February 14, 2012
PubMed
Summary

This study measured the shear modulus of human eye lenses to model accommodation. Lens stiffness increases with age, with the nucleus becoming stiffer than the cortex around age 45.

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Last Updated: May 25, 2026

Automated Compression Testing of the Ocular Lens
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Simulating the Mechanics of Lens Accommodation via a Manual Lens Stretcher
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Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses
07:56

Sequential Application of Glass Coverslips to Assess the Compressive Stiffness of the Mouse Lens: Strain and Morphometric Analyses

Published on: May 3, 2016

Area of Science:

  • Ophthalmology
  • Biomechanical Engineering
  • Materials Science

Background:

  • Accurate computational models of the eye's accommodation process require precise material properties of the human lens.
  • Previous studies have yielded inconsistent data on lens biomechanics, necessitating further experimental investigation.

Purpose of the Study:

  • To experimentally determine the shear modulus of human eye lenses across a range of ages.
  • To provide data for developing computational models of the eye's accommodation process.
  • To investigate age-related changes in lens mechanical properties.

Main Methods:

  • Mechanical testing of donated human eye bank lenses using a spinning test rig to induce deformation.
  • Finite element inverse analysis to infer shear modulus from observed deformations.
  • Testing of 29 lenses from individuals aged 12 to 58 years, with post-mortem times ranging from 47 to 110 hours.

Main Results:

  • For younger lenses, the cortex is stiffer than the nucleus.
  • Both nuclear and cortical shear moduli increase with age.
  • The nucleus becomes stiffer than the cortex from approximately 45 years of age onwards due to a more rapid increase in nuclear stiffness.

Conclusions:

  • The study provides crucial shear modulus data for human lenses, essential for refining accommodation models.
  • Age-related changes in lens stiffness, particularly the shift in relative stiffness between nucleus and cortex, are quantified.
  • The developed 'age-stiffness' models are suitable for integration into finite element models of accommodation.