Dynamic Mechanical Properties of Rhinoscerous Horn Keraton in the Frequency Range 2-20 KHz

Abstract

A method is described for measuring the elastic modulus and loss tangent of rhinoscerous horn keratin in the frequency range 2 20 kHz. The technique is based on the forced resonance of a composite made of a specimen of rhinoscerous horn keratin cemented between two matched aluminum bars. Modulus is determined from the resonant frequency and loss tangent from the band width.

Elastic modulus was found to be 5.7 8.0 × 10¹⁰ dynes/cm² along the fiber direction, and 3-4 × 10¹⁰ dynes cm² at right angles to the fiber direction, for samples at 9% regain and room temperatures. Loss tangents were found to be 2-4 × 10^-2 along the fiber direction and 3-6 × 10 ² at right angles to the fiber direction.