Analysis of the High Temperature Internal Friction Background through a New Measuring Technique

An analysis of different expressions proposed in the literature for the description of the high-temperature internal friction background is presented. All the equations suggested include an exponential dependence of the internal friction with the reciprocal of the temperature, plus a pre-exponential...

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Detalles Bibliográficos
Autores principales:	Povolo, F., Lambri, O.A.
Formato:	JOUR
Materias:	high-temperature background internal friction magnesium torsion pendulum zircaloy-4
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09161821_v33_n10_p904_Povolo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_09161821_v33_n10_p904_Povolo
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spelling	todo:paper_09161821_v33_n10_p904_Povolo2023-10-03T15:44:42Z Analysis of the High Temperature Internal Friction Background through a New Measuring Technique Povolo, F. Lambri, O.A. high-temperature background internal friction magnesium torsion pendulum zircaloy-4 An analysis of different expressions proposed in the literature for the description of the high-temperature internal friction background is presented. All the equations suggested include an exponential dependence of the internal friction with the reciprocal of the temperature, plus a pre-exponential term which, in general, depends both on frequency and on temperature. Due to the dominance of the exponential term, however, it is difficult, with the usual experimental techniques, to obtain information of the pre-exponential factor. A new experimental technique is presented, which uses a torsion pendulum with variable moment of inertia, operating in such a way that it is possible to obtain the high-temperature internal friction background as a function of temperature, both at variable and at constant frequency. This gives information not only on the damping but also on its changes with frequency and temperature. Finally, it is shown how the new measuring technique and the analysis of the data can be used, by applying them to actual experimental data obtained in Zircaloy-4 and magnesium. © 1992, The Japan Institute of Metals. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09161821_v33_n10_p904_Povolo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	high-temperature background internal friction magnesium torsion pendulum zircaloy-4
spellingShingle	high-temperature background internal friction magnesium torsion pendulum zircaloy-4 Povolo, F. Lambri, O.A. Analysis of the High Temperature Internal Friction Background through a New Measuring Technique
topic_facet	high-temperature background internal friction magnesium torsion pendulum zircaloy-4
description	An analysis of different expressions proposed in the literature for the description of the high-temperature internal friction background is presented. All the equations suggested include an exponential dependence of the internal friction with the reciprocal of the temperature, plus a pre-exponential term which, in general, depends both on frequency and on temperature. Due to the dominance of the exponential term, however, it is difficult, with the usual experimental techniques, to obtain information of the pre-exponential factor. A new experimental technique is presented, which uses a torsion pendulum with variable moment of inertia, operating in such a way that it is possible to obtain the high-temperature internal friction background as a function of temperature, both at variable and at constant frequency. This gives information not only on the damping but also on its changes with frequency and temperature. Finally, it is shown how the new measuring technique and the analysis of the data can be used, by applying them to actual experimental data obtained in Zircaloy-4 and magnesium. © 1992, The Japan Institute of Metals. All rights reserved.
format	JOUR
author	Povolo, F. Lambri, O.A.
author_facet	Povolo, F. Lambri, O.A.
author_sort	Povolo, F.
title	Analysis of the High Temperature Internal Friction Background through a New Measuring Technique
title_short	Analysis of the High Temperature Internal Friction Background through a New Measuring Technique
title_full	Analysis of the High Temperature Internal Friction Background through a New Measuring Technique
title_fullStr	Analysis of the High Temperature Internal Friction Background through a New Measuring Technique
title_full_unstemmed	Analysis of the High Temperature Internal Friction Background through a New Measuring Technique
title_sort	analysis of the high temperature internal friction background through a new measuring technique
url	http://hdl.handle.net/20.500.12110/paper_09161821_v33_n10_p904_Povolo
work_keys_str_mv	AT povolof analysisofthehightemperatureinternalfrictionbackgroundthroughanewmeasuringtechnique AT lambrioa analysisofthehightemperatureinternalfrictionbackgroundthroughanewmeasuringtechnique
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Analysis of the High Temperature Internal Friction Background through a New Measuring Technique

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