A nonlinear finite-element model of the newborn ear canal | Zendy

Qi Li | Zendy; Hengjin Liu | Zendy; Justyn Lutfy | Zendy; W. Robert J. Funnell | Zendy; Sam J. Daniel | Zendy

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A nonlinear finite-element model of the newborn ear canal

Author(s) -

Qi Li,

Hengjin Liu,

Justyn Lutfy,

W. Robert J. Funnell,

Sam J. Daniel

Publication year - 2006

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.2363944

Subject(s) - hyperelastic material , finite element method , ear canal , nonlinear system , modulus , materials science , volume (thermodynamics) , mechanics , constitutive equation , structural engineering , physics , acoustics , composite material , engineering , thermodynamics , quantum mechanics

A three-dimensional nonlinear finite-element model of a 22-day-old newborn ear canal is presented. The geometry is based on a clinical x-ray CT scan. A nonlinear hyperelastic constitutive law is applied to model large deformations. The Young's modulus of the soft tissue is found to have a significant effect on the ear-canal volume change, which ranges from approximately 27% to 75% over the static-pressure range of +/-3kPa. The effects of Poisson's ratio and of the ratio C10: C01 in the hyperelastic model are found to be small. The volume changes do not reach a plateau at high pressures, which implies that the newborn ear-canal wall would not be rigid in tympanometric measurements. The displacements and volume changes calculated from the model are compared with available experimental data.

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