Creep and/or Relaxation tests on viscoelastic materials show a power-law trend. Based upon Boltzmann superposition principle the constitutive law with a power-law kernel is ruled by the Caputo’s fractional derivative. Fractional constitutive law posses a long memory and then the parameters obtained by best fitting procedures on experimental data are strongly influenced by the prestress on the specimen. As in fact during the relaxation test the imposed history of deformation is not instantaneously applied, since a unit step function may not be realized by the test machine. Aim of this paper, it is shown that, the experimental procedure, and in particular the initial ramp to reach the constant stress (or strain) strongly influences the best fitting procedure and the coefficients of the power-law.

Di Paola, M., Fiore, V., Pinnola, F.P., Valenza, A. (2013). Prestress and experimental tests on fractional viscoelastic materials. In XXI Congresso Associazione Italiana di meccanica teorica e applicata (AIMETA).

Prestress and experimental tests on fractional viscoelastic materials

DI PAOLA, Mario;FIORE, Vincenzo;PINNOLA, Francesco Paolo;VALENZA, Antonino
2013-01-01

Abstract

Creep and/or Relaxation tests on viscoelastic materials show a power-law trend. Based upon Boltzmann superposition principle the constitutive law with a power-law kernel is ruled by the Caputo’s fractional derivative. Fractional constitutive law posses a long memory and then the parameters obtained by best fitting procedures on experimental data are strongly influenced by the prestress on the specimen. As in fact during the relaxation test the imposed history of deformation is not instantaneously applied, since a unit step function may not be realized by the test machine. Aim of this paper, it is shown that, the experimental procedure, and in particular the initial ramp to reach the constant stress (or strain) strongly influences the best fitting procedure and the coefficients of the power-law.
17-set-2013
XXI Congresso Associazione Italiana di meccanica teorica e applicata (AIMETA)
Torino
17-20 Settembre 2013
2013
10
Di Paola, M., Fiore, V., Pinnola, F.P., Valenza, A. (2013). Prestress and experimental tests on fractional viscoelastic materials. In XXI Congresso Associazione Italiana di meccanica teorica e applicata (AIMETA).
Proceedings (atti dei congressi)
Di Paola, M; Fiore, V; Pinnola, FP; Valenza, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/100189
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