RFDA as a tool for the investigation of the rheology of glasses

Yann Gueguen (1) , Fabrice Célarié , Jean Rocherullé (2)

1 IPR - Institut de Physique de Rennes
2 ISCR - Institut des Sciences Chimiques de Rennes

The Resonance Frequencies and Damping Analysis (RFDA) has become a widely used technique to measure the elastic properties of materials at high temperatures and especially of inorganic glasses. Usually, the resonance frequency of the first vibration mode of the sample and its damping are analyzed to deduced an elastic modulus and the internal friction respectively. We will show here that the RFDA technique does not actually allow for the measurement of elastic moduli, or only with very restrictive conditions. The resonance frequencies allow for the measurement of a first viscoelastic modulus (“storage modulus”) and combined with the corresponding damping, for the measurement of a second viscoelastic modulus (“loss modulus”). We will show here how we can calculate these moduli, and, at the end, deduced the elastic modulus. By the analysis of all the resonance frequencies of all the measured vibration modes, we will also show how we can extract individually the activation energies of the relaxation processes of a glass material. Examples will be shown of phosphate and silicate glasses.

Mots clés: viscoelasticity; glasses; RFDA

Domaines: Mécanique des matériaux [physics.class-ph]

Yann Gueguen, Fabrice Célarié, Jean Rocherullé. RFDA as a tool for the investigation of the rheology of glasses. Flow and Fracture of Advanced Glasses 7, Jul 2017, Aalborg, Denmark. ⟨hal-01560213⟩