Determining the Orthotropic Properties of Gerbil Basilar Membrane from Space Constant Measurements
Abstract
A geometrically nonlinear composite orthotropic plate finite element model is developed to analyze two sets of experimental results in order to extract the two effective elastic moduli, the effective shear modulus and the effective Poisson's ratio for the gerbil cochlea partition. It is shown that the spatial decay rate (the space constant) for the inplane deflection is different than for the outofplane deflection, which has a significant effect on the derived partition properties. Orthotropy ratios (the ratio of the two elastic moduli) are approximately 65 close to the base to 10 in the upper middle turn of the cochlea.
 Publication:

What Fire is in Mine Ears: Progress in Auditory Biomechanics
 Pub Date:
 November 2011
 DOI:
 10.1063/1.3658109
 Bibcode:
 2011AIPC.1403..346L
 Keywords:

 finite element analysis;
 geometry;
 ear;
 continuum mechanics;
 02.70.Dh;
 45.10.Na;
 43.64.Dw;
 46.70.De;
 Finiteelement and Galerkin methods;
 Geometrical and tensorial methods;
 Anatomy of the cochlea and auditory nerve;
 Beams plates and shells