Viscoelastic shear properties of human vocal fold mucosa: Theoretical characterization based on constitutive modeling

Roger W. Chan, Ingo R. Titze

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Abstract

The viscoelastic shear properties of human vocal fold mucosa (cover) were previously measured as a function of frequency [Chart and Titze, J. Acoust. Soc. Am. 106, 2008-2021 (1999)], but data were obtained only in a frequency range of 0.01-15 Hz, an order of magnitude below typical frequencies of vocal fold oscillation (on the order of 100 Hz). This study represents an attempt to extrapolate the data to higher frequencies based on two viscoelastic theories, (1) a quasilinear viscoelastic theory widely used for the constitutive modeling of the viscoelastic properties of biological tissues [Fung, Biomechanics (Springer-Verlag, New York, 1993), pp. 277-292], and (2) a molecular (statistical network) theory commonly used for the rheological modeling of polymeric materials [Zhu et al., J. Biomech. 24, 1007-1018 (1991)]. Analytical expressions of elastic and viscous shear moduli, dynamic viscosity, and damping ratio based on the two theories with specific model parameters were applied to curve-fit the empirical data. Results showed that the theoretical predictions matched the empirical data reasonably well, allowing for parametric descriptions of the data and their extrapolations to frequencies of phonation.

Original languageEnglish (US)
Pages (from-to)565-580
Number of pages16
JournalJournal of the Acoustical Society of America
Volume107
Issue number1
DOIs
Publication statusPublished - Jan 2000

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ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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