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Abstract:

The complex elastic modulus, or its real component and the internal friction, are the mechanical variables that characterize the dynamic behaviour of linear viscoelastic materials. Free or forced oscillations produced by inverted torsion pendulums or rheometers are usually used to measure these variables. Linearity is checked sometimes by recording the stress vs. strain curve, otherwise by measuring whether the internal friction or any component of the dynamic modulus is independent of the strain amplitude. This paper demonstrates that the linear dynamic response of viscoelastic materials cannot be assured just by looking at the stress-strain amplitude detected by forced oscillation torsion devices. Furthermore, it is shown that internal friction measured at the resonance frequency of the experimental device provides an extremely accurate tool to determine the presence of nonlinear mechanical effects. This issue is shown for polycarbonate samples submitted to forced oscillations in a torsion pendulum working at resonance. © 2005 Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Extended capabilities of an inverted torsion pendulum
Autor:Hermida, E.B.; Cieri, L.J.
Filiación:Department of Materials (CNEA), Instituto de Tecnología Prof. J. Sabato (UNSAM-CNEA), Av. Gral. Paz 1499, B1650KNA San Martín, Argentina
CONICET, Av. Rivadavia 1917, 1033 Buenos Aires, Argentina
Department of Physicis, University of Buenos Aires, Ciudad Universitaria, Pab. I, 1428 Buenos Aires, Argentina
Palabras clave:Forced oscillations; Nonlinear viscoelasticity; Polycarbonate; Torsion pendulum; Elastic moduli; Friction; Polycarbonates; Rheometers; Torsional stress; Viscoelasticity; Forced oscillations; Nonlinear viscoelasticity; Stress-strain amplitude; Torsion pendulum; Pendulums
Año:2006
Volumen:25
Número:2
Página de inicio:276
Página de fin:279
DOI: http://dx.doi.org/10.1016/j.polymertesting.2005.09.013
Título revista:Polymer Testing
Título revista abreviado:Polym Test
ISSN:01429418
CODEN:POTED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01429418_v25_n2_p276_Hermida

Referencias:

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Citas:

---------- APA ----------
Hermida, E.B. & Cieri, L.J. (2006) . Extended capabilities of an inverted torsion pendulum. Polymer Testing, 25(2), 276-279.
http://dx.doi.org/10.1016/j.polymertesting.2005.09.013
---------- CHICAGO ----------
Hermida, E.B., Cieri, L.J. "Extended capabilities of an inverted torsion pendulum" . Polymer Testing 25, no. 2 (2006) : 276-279.
http://dx.doi.org/10.1016/j.polymertesting.2005.09.013
---------- MLA ----------
Hermida, E.B., Cieri, L.J. "Extended capabilities of an inverted torsion pendulum" . Polymer Testing, vol. 25, no. 2, 2006, pp. 276-279.
http://dx.doi.org/10.1016/j.polymertesting.2005.09.013
---------- VANCOUVER ----------
Hermida, E.B., Cieri, L.J. Extended capabilities of an inverted torsion pendulum. Polym Test. 2006;25(2):276-279.
http://dx.doi.org/10.1016/j.polymertesting.2005.09.013