Assessing composition and structure of soft biphasic media from Kelvin-Voigt fractional derivative model parameters

Hongmei Zhang, Yue Wang, Mostafa Fatemi, Michael F. Insana

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Kelvin-Voigt fractional derivative (KVFD) model parameters have been used to describe viscoelastic properties of soft tissues. However, translating model parameters into a concise set of intrinsic mechanical properties related to tissue composition and structure remains challenging. This paper begins by exploring these relationships using a biphasic emulsion materials with known composition. Mechanical properties are measured by analyzing data from two indentation techniques - ramp-stress relaxation and load-unload hysteresis tests. Material composition is predictably correlated with viscoelastic model parameters. Model parameters estimated from the tests reveal that elastic modulus E 0 closely approximates the shear modulus for pure gelatin. Fractional-order parameter α and time constant τ vary monotonically with the volume fraction of the material's fluid component. α characterizes medium fluidity and the rate of energy dissipation, and τ is a viscous time constant. Numerical simulations suggest that the viscous coefficient η is proportional to the energy lost during quasi-static force-displacement cycles, E A. The slope of E A versus η is determined by α and the applied indentation ramp time T r. Experimental measurements from phantom and ex vivo liver data show close agreement with theoretical predictions of the relation. The relative error is less than 20% for emulsions 22% for liver. We find that KVFD model parameters form a concise features space for biphasic medium characterization that described time-varying mechanical properties.

Original languageEnglish (US)
Article number035703
JournalMeasurement Science and Technology
Volume28
Issue number3
DOIs
StatePublished - Jan 17 2017

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Kelvin
Fractional Derivative
Derivatives
Mechanical Properties
Chemical analysis
Emulsion
Indentation
Time Constant
Liver
Mechanical properties
Emulsions
mechanical properties
ramps
indentation
liver
Elastic moduli
time constant
emulsions
Tissue
Stress Relaxation

ASJC Scopus subject areas

  • Instrumentation
  • Applied Mathematics

Cite this

Assessing composition and structure of soft biphasic media from Kelvin-Voigt fractional derivative model parameters. / Zhang, Hongmei; Wang, Yue; Fatemi, Mostafa; Insana, Michael F.

In: Measurement Science and Technology, Vol. 28, No. 3, 035703, 17.01.2017.

Research output: Contribution to journalArticle

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