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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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Technical Note: Modelling Soft Tissue Using Biphasic Theory - A Word of Caution.

Dr. KAROL Miller1

  • 1Department of Mechanical and Materials Engineering, The University of Western Australia, Nedlands WA 6907, AUSTRALIA.

Computer Methods in Biomechanics and Biomedical Engineering
|March 27, 2001
PubMed
Summary

Biphasic models are popular for soft tissues but cannot fully capture viscoelasticity. Their use is limited to high-speed loading conditions where phase velocities are significant.

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Area of Science:

  • Biomechanics
  • Biomaterials Science
  • Tissue Engineering

Background:

  • The biphasic model is widely used for simulating hydrated soft tissues like cartilage and brain.
  • This model assumes separate solid and fluid phases with distinct mechanical properties.

Purpose of the Study:

  • To evaluate the limitations of current biphasic models in representing soft tissue mechanics.
  • To identify the specific conditions under which biphasic models are applicable.

Main Methods:

  • Analysis of the theoretical framework of biphasic models.
  • Comparison of model predictions with experimental data under varying loading rates.
  • Identification of the role of solid-phase viscoelasticity.

Main Results:

  • Biphasic models inherently struggle to incorporate stress-strain rate dependence due to solid-phase viscoelasticity.
  • The applicability of biphasic models is restricted to scenarios with high relative velocities between the solid and fluid phases.
  • Model accuracy diminishes under slow loading rates where viscoelastic effects become prominent.

Conclusions:

  • Current biphasic models have limitations in accurately predicting the behavior of soft tissues, particularly concerning viscoelasticity.
  • Researchers must consider the loading rate and potential for solid-phase viscoelasticity when applying biphasic models.
  • Further model development is needed to fully capture the complex mechanical responses of hydrated soft tissues.