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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and reloaded.

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Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing
07:07

Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing

Published on: December 13, 2016

Mechanical properties of soft human tissues under dynamic loading.

H Saraf1, K T Ramesh, A M Lennon

  • 1Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA.

Journal of Biomechanics
|November 28, 2006
PubMed
Summary

This study measured the dynamic mechanical properties of human tissues under compression and shear using modified Kolsky bar techniques. Results show linear bulk modulus but non-linear shear stress responses for stomach, heart, liver, and lung tissues.

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Area of Science:

  • Biomechanics
  • Materials Science
  • Medical Engineering

Background:

  • Understanding the dynamic mechanical behavior of soft human tissues is crucial for medical device design and surgical simulation.
  • Existing techniques often struggle to accurately capture tissue response under dynamic loading conditions.

Purpose of the Study:

  • To investigate the dynamic bulk and shear response of human tissues (stomach, heart, liver, lung) using a modified Kolsky bar.
  • To quantify the dynamic bulk modulus and shear stress-strain relationship for these specific tissues.

Main Methods:

  • Utilized a modified Kolsky bar apparatus to apply hydrostatic compression and simple shear loads to soft tissue specimens.
  • Acquired dynamic response data from cadaveric human tissues including stomach, heart, liver, and lung.
  • Analyzed the data to determine dynamic bulk modulus and shear stress-strain characteristics.

Main Results:

  • The dynamic bulk response of the studied tissues exhibited a linear relationship with pressure, allowing for a straightforward linear fit of the bulk modulus.
  • In contrast, the dynamic shearing response demonstrated significant non-linearity, characterized by an exponential increase in shear stress with increasing strain.
  • Distinct quantitative measures for dynamic bulk modulus and shear response were obtained for each tissue type.

Conclusions:

  • Human soft tissues display distinct linear bulk and non-linear shear responses under dynamic loading.
  • The modified Kolsky bar technique provides valuable quantitative data on the dynamic mechanical properties of various human tissues.
  • These findings contribute to a better understanding of tissue mechanics for applications in biomedical engineering and computational modeling.