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Poisson's ratio in skin.

C Lees1, J F Vincent, J E Hillerton

  • 1Department of Zoology, The University, Whiteknights, Reading, Berks.

Bio-Medical Materials and Engineering
|January 1, 1991
PubMed
Summary

Cow teat skin exhibits anisotropic mechanical properties, with a Poisson's ratio significantly greater than 1.0 at low strains. This behavior, similar to knitted fabric, suggests skin functions as a fibrous network, not a continuum.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Dermatology

Background:

  • Poisson's ratio is a key material property describing deformation under stress.
  • Understanding the mechanical behavior of biological tissues like skin is crucial for various applications.

Purpose of the Study:

  • To investigate the Poisson's ratio of cow teat skin under uni- and biaxial loading.
  • To compare the mechanical properties of cow teat skin with other materials like arteries and knitted fabrics.
  • To determine if skin can be modeled as a continuum or a fibrous network.

Main Methods:

  • Uni- and biaxial mechanical testing of cow teat skin samples.
  • Measurement of Poisson's ratio at varying strain levels.
  • Comparative analysis with data from distending arteries and knitted fabrics.

Main Results:

  • Cow teat skin demonstrates anisotropic behavior and aspect ratio-dependent Poisson's ratio.
  • At low strains (<0.1), the biaxial Poisson's ratio of cow teat skin exceeds 1.0.
  • Knitted fabric exhibits a negative Poisson's ratio at low strains, similar to cow teat skin.

Conclusions:

  • The mechanical properties of cow teat skin, particularly its high and negative Poisson's ratio at low strains, challenge the continuum model.
  • Skin's mechanical behavior is better represented as an open feltwork of fibers.
  • These findings have implications for understanding tissue mechanics and designing biomimetic materials.

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