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Related Concept Videos

Elastin is Responsible for Tissue Elasticity01:12

Elastin is Responsible for Tissue Elasticity

Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
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...
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
Viscosity of Fluid01:19

Viscosity of Fluid

Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.

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Related Experiment Video

Updated: May 24, 2026

Biological Preparation and Mechanical Technique for Determining Viscoelastic Properties of Zonular Fibers
06:39

Biological Preparation and Mechanical Technique for Determining Viscoelastic Properties of Zonular Fibers

Published on: December 16, 2021

[Is viscoelastic the corneal tissue?].

A Albanese1, E Battisti, G M Galassi

  • 1Fisica Medica, Dipartimento di Fisica, Università di Siena, Italia. albanesea@unisi.it

La Clinica Terapeutica
|February 25, 2012
PubMed
Summary
This summary is machine-generated.

Corneal tissue exhibits distinct exponential stress-strain curves, differing from the typical viscoelastic behavior of other soft tissues. Further research is needed to understand cross-linking mechanisms and guide therapeutic choices.

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Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography
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Viscoelastic Characterization of Soft Tissue-Mimicking Gelatin Phantoms using Indentation and Magnetic Resonance Elastography

Published on: May 10, 2022

Area of Science:

  • Biomechanical modeling
  • Ophthalmology
  • Tissue engineering

Context:

  • Soft tissues typically exhibit viscoelastic properties, characterized by a Maxwellian element response.
  • Previous studies on corneal tissue behavior have yielded singular observations.
  • Understanding corneal biomechanics is crucial for refractive surgery and disease management.

Purpose:

  • To compare the established viscoelastic properties of soft tissues with published data on corneal tissue behavior.
  • To evaluate the applicability of the Maxwell viscoelastic model to corneal tissue.
  • To investigate the stress-strain behavior of riboflavin and UVA treated/untreated corneal tissue.

Summary:

  • The Maxwell viscoelastic model accurately simulates the asymptotic stress-strain curves of various soft tissues.
  • Corneal tissue samples, however, displayed distinct exponential stress-strain curves.
  • This divergence suggests that corneal tissue may not adhere to typical viscoelastic principles.

Impact:

  • The findings highlight a potential incompatibility between the assumed viscoelasticity of corneal tissue and observed experimental data.
  • This necessitates further investigation into potential technical issues in experiments or the non-viscoelastic nature of corneal tissue.
  • Clarifying corneal tissue mechanics is essential for advancing cross-linking therapies and informing clinical decisions.