ICIFUAS 11
Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. IV France 06 (1996) C8-313-C8-316
DOI: 10.1051/jp4:1996868

Experimental Verification of the Behaviour of the Different Expressions for Measuring Amplitude Dependent Damping

O.A. Lambri<sup>1, 2, 3

1</sup>  Laboratorio de Espectroscopía Mecánico Dinámica, Instituto de Física Rosario (IFIR-CONICET-UNR), Avda. 27 de febrero 210 bis, 2000 Rosario Argentina
²  Universidad Nacional de Rosario, Departamento de Física, Avda. Pellegrini 250, 2000 Rosario, Argentina
³  Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain

Abstract
The agreement between the intrinsic damping, obtained from the sustained oscillations measurements, and the values measured directly in forced oscillations has been verified. Therefore, it is possible to measure directly the intrinsic damping from forced oscillations, without additional calculations and with minor effort. At the same time the damping behaviour measured by different modes with a torsion pendulum, i. e. forced oscillations, sustained oscillations and free decay, in presence of amplitude dependent damping was also studied and similar results are obtained..

© EDP Sciences 1996